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Default SSL-Options #963

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opened 2026-10-05 04:55:45 +02:00 by adam · 3 comments
adam commented 2026-10-05 04:55:45 +02:00
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Playing around with https://github.com/drwetter/testssl.sh this Tool reports some Problems with the znc-webadmin and SSL:

1.9.x-git-77-47e633b2
./configure --prefix=$HOME --disable-cyrus --disable-ipv6
OpenSSL 1.1.1g  21 Apr 2020

+------------------------+
| ZNC 1.9.x configured   |
|                        |
| Prefix    : /home/bla  |
| SSL       : yes        |
| IPv6      : no         |
| Async DNS : yes        |
| Perl      : no         |
| Python    : no         |
| Tcl       : no         |
| Cyrus     : no         |
| Charset   : yes        |
| Zlib      : yes        |
| i18n      : yes        |
+------------------------+

./testssl.sh --openssl /usr/bin/openssl --wide 192.168.0.2:50000


###########################################################
    testssl.sh       3.1dev from https://testssl.sh/dev/
    (3d07f55 2020-09-22 17:35:31 -- )

      This program is free software. Distribution and
             modification under GPLv2 permitted.
      USAGE w/o ANY WARRANTY. USE IT AT YOUR OWN RISK!

       Please file bugs @ https://testssl.sh/bugs/

###########################################################

 Using "OpenSSL 1.1.1g  21 Apr 2020" [~99 ciphers]
 on knecht:/usr/bin/openssl
 (built: "May 24 19:14:32 2020", platform: "linux-x86_64")


 Start 2020-09-24 03:09:50        -->> 192.168.0.2:50000 (192.168.0.2) <<--

 rDNS (192.168.0.2):     host.
 Service detected:       HTTP


 Testing protocols via sockets except NPN+ALPN 

 SSLv2      not offered (OK)
 SSLv3      not offered (OK)
 TLS 1      offered (deprecated)
 TLS 1.1    offered (deprecated)
 TLS 1.2    offered (OK)
 TLS 1.3    offered (OK): final
 NPN/SPDY   not offered
 ALPN/HTTP2 not offered

 Testing cipher categories 

 NULL ciphers (no encryption)                      not offered (OK)
 Anonymous NULL Ciphers (no authentication)        not offered (OK)
 Export ciphers (w/o ADH+NULL)                     not offered (OK)
 LOW: 64 Bit + DES, RC[2,4], MD5 (w/o export)      not offered (OK)
 Triple DES Ciphers / IDEA                         not offered
 Obsoleted CBC ciphers (AES, ARIA etc.)            offered
 Strong encryption (AEAD ciphers) with no FS       offered (OK)
 Forward Secrecy strong encryption (AEAD ciphers)  offered (OK)


 Testing server's cipher preferences 

 Has server cipher order?     yes (OK) -- TLS 1.3 and below
 Negotiated protocol          TLSv1.3
 Negotiated cipher            TLS_AES_256_GCM_SHA384, 253 bit ECDH (X25519)
 Cipher per protocol

Hexcode  Cipher Suite Name (OpenSSL)       KeyExch.   Encryption  Bits     Cipher Suite Name (IANA/RFC)
-----------------------------------------------------------------------------------------------------------------------------
SSLv2
 - 
SSLv3
 - 
TLSv1 (server order)
 xc013   ECDHE-RSA-AES128-SHA              ECDH 253   AES         128      TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA                 
 xc014   ECDHE-RSA-AES256-SHA              ECDH 253   AES         256      TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA                 
 x33     DHE-RSA-AES128-SHA                DH 2048    AES         128      TLS_DHE_RSA_WITH_AES_128_CBC_SHA                   
 x39     DHE-RSA-AES256-SHA                DH 2048    AES         256      TLS_DHE_RSA_WITH_AES_256_CBC_SHA                   
 x2f     AES128-SHA                        RSA        AES         128      TLS_RSA_WITH_AES_128_CBC_SHA                       
 x35     AES256-SHA                        RSA        AES         256      TLS_RSA_WITH_AES_256_CBC_SHA                       
TLSv1.1 (server order)
 xc013   ECDHE-RSA-AES128-SHA              ECDH 253   AES         128      TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA                 
 xc014   ECDHE-RSA-AES256-SHA              ECDH 253   AES         256      TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA                 
 x33     DHE-RSA-AES128-SHA                DH 2048    AES         128      TLS_DHE_RSA_WITH_AES_128_CBC_SHA                   
 x39     DHE-RSA-AES256-SHA                DH 2048    AES         256      TLS_DHE_RSA_WITH_AES_256_CBC_SHA                   
 x2f     AES128-SHA                        RSA        AES         128      TLS_RSA_WITH_AES_128_CBC_SHA                       
 x35     AES256-SHA                        RSA        AES         256      TLS_RSA_WITH_AES_256_CBC_SHA                       
TLSv1.2 (server order)
 xcca8   ECDHE-RSA-CHACHA20-POLY1305       ECDH 253   ChaCha20    256      TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256        
 xc02f   ECDHE-RSA-AES128-GCM-SHA256       ECDH 253   AESGCM      128      TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256              
 xc030   ECDHE-RSA-AES256-GCM-SHA384       ECDH 253   AESGCM      256      TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384              
 x9e     DHE-RSA-AES128-GCM-SHA256         DH 2048    AESGCM      128      TLS_DHE_RSA_WITH_AES_128_GCM_SHA256                
 x9f     DHE-RSA-AES256-GCM-SHA384         DH 2048    AESGCM      256      TLS_DHE_RSA_WITH_AES_256_GCM_SHA384                
 xc027   ECDHE-RSA-AES128-SHA256           ECDH 253   AES         128      TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256              
 xc028   ECDHE-RSA-AES256-SHA384           ECDH 253   AES         256      TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384              
 xc013   ECDHE-RSA-AES128-SHA              ECDH 253   AES         128      TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA                 
 xc014   ECDHE-RSA-AES256-SHA              ECDH 253   AES         256      TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA                 
 x67     DHE-RSA-AES128-SHA256             DH 2048    AES         128      TLS_DHE_RSA_WITH_AES_128_CBC_SHA256                
 x33     DHE-RSA-AES128-SHA                DH 2048    AES         128      TLS_DHE_RSA_WITH_AES_128_CBC_SHA                   
 x6b     DHE-RSA-AES256-SHA256             DH 2048    AES         256      TLS_DHE_RSA_WITH_AES_256_CBC_SHA256                
 x39     DHE-RSA-AES256-SHA                DH 2048    AES         256      TLS_DHE_RSA_WITH_AES_256_CBC_SHA                   
 x9c     AES128-GCM-SHA256                 RSA        AESGCM      128      TLS_RSA_WITH_AES_128_GCM_SHA256                    
 x9d     AES256-GCM-SHA384                 RSA        AESGCM      256      TLS_RSA_WITH_AES_256_GCM_SHA384                    
 x3c     AES128-SHA256                     RSA        AES         128      TLS_RSA_WITH_AES_128_CBC_SHA256                    
 x3d     AES256-SHA256                     RSA        AES         256      TLS_RSA_WITH_AES_256_CBC_SHA256                    
 x2f     AES128-SHA                        RSA        AES         128      TLS_RSA_WITH_AES_128_CBC_SHA                       
 x35     AES256-SHA                        RSA        AES         256      TLS_RSA_WITH_AES_256_CBC_SHA                       
TLSv1.3 (server order)
 x1302   TLS_AES_256_GCM_SHA384            ECDH 253   AESGCM      256      TLS_AES_256_GCM_SHA384                             
 x1303   TLS_CHACHA20_POLY1305_SHA256      ECDH 253   ChaCha20    256      TLS_CHACHA20_POLY1305_SHA256                       
 x1301   TLS_AES_128_GCM_SHA256            ECDH 253   AESGCM      128      TLS_AES_128_GCM_SHA256                             


 Testing robust forward secrecy (FS) -- omitting Null Authentication/Encryption, 3DES, RC4 

 FS is offered (OK) , ciphers follow (client/browser support is important here) 

Hexcode  Cipher Suite Name (OpenSSL)       KeyExch.   Encryption  Bits     Cipher Suite Name (IANA/RFC)
-----------------------------------------------------------------------------------------------------------------------------
 x1302   TLS_AES_256_GCM_SHA384            ECDH 253   AESGCM      256      TLS_AES_256_GCM_SHA384                             
 x1303   TLS_CHACHA20_POLY1305_SHA256      ECDH 253   ChaCha20    256      TLS_CHACHA20_POLY1305_SHA256                       
 xc030   ECDHE-RSA-AES256-GCM-SHA384       ECDH 253   AESGCM      256      TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384              
 xc028   ECDHE-RSA-AES256-SHA384           ECDH 253   AES         256      TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384              
 xc014   ECDHE-RSA-AES256-SHA              ECDH 253   AES         256      TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA                 
 x9f     DHE-RSA-AES256-GCM-SHA384         DH 2048    AESGCM      256      TLS_DHE_RSA_WITH_AES_256_GCM_SHA384                
 xcca8   ECDHE-RSA-CHACHA20-POLY1305       ECDH 253   ChaCha20    256      TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256        
 x6b     DHE-RSA-AES256-SHA256             DH 2048    AES         256      TLS_DHE_RSA_WITH_AES_256_CBC_SHA256                
 x39     DHE-RSA-AES256-SHA                DH 2048    AES         256      TLS_DHE_RSA_WITH_AES_256_CBC_SHA                   
 x1301   TLS_AES_128_GCM_SHA256            ECDH 253   AESGCM      128      TLS_AES_128_GCM_SHA256                             
 xc02f   ECDHE-RSA-AES128-GCM-SHA256       ECDH 253   AESGCM      128      TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256              
 xc027   ECDHE-RSA-AES128-SHA256           ECDH 253   AES         128      TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256              
 xc013   ECDHE-RSA-AES128-SHA              ECDH 253   AES         128      TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA                 
 x9e     DHE-RSA-AES128-GCM-SHA256         DH 2048    AESGCM      128      TLS_DHE_RSA_WITH_AES_128_GCM_SHA256                
 x67     DHE-RSA-AES128-SHA256             DH 2048    AES         128      TLS_DHE_RSA_WITH_AES_128_CBC_SHA256                
 x33     DHE-RSA-AES128-SHA                DH 2048    AES         128      TLS_DHE_RSA_WITH_AES_128_CBC_SHA                   

 Elliptic curves offered:     prime256v1 secp384r1 secp521r1 X25519 X448 
 DH group offered:            Unknown DH group (2048 bits)

 Testing server defaults (Server Hello) 

 TLS extensions (standard)    "renegotiation info/#65281" "EC point formats/#11" "session ticket/#35" "supported versions/#43" "key share/#51" "max fragment length/#1" "encrypt-then-mac/#22"
                              "extended master secret/#23"
 Session Ticket RFC 5077 hint 7200 seconds, session tickets keys seems to be rotated < daily
 SSL Session ID support       yes
 Session Resumption           Tickets no, ID: no
 TLS clock skew               Random values, no fingerprinting possible 
 Signature Algorithm          SHA256 with RSA
 Server key size              RSA 2048 bits (exponent is 65537)
 Server key usage             --
 Server extended key usage    --
 Serial / Fingerprints        1C71 / SHA1 x
                              SHA256 xxxxxxx
 Common Name (CN)             host.unknown 
 subjectAltName (SAN)         missing (NOT ok) -- Browsers are complaining
 Issuer                       host.unknown
 Trust (hostname)             certificate does not match supplied URI
 Chain of trust               NOT ok (self signed)
 EV cert (experimental)       no 
 Bad OCSP intermediate (exp.) Ok
 ETS/"eTLS", visibility info  not present
 Certificate Validity (UTC)   3649 >= 60 days (2020-09-24 02:52 --> 2030-09-22 02:52)
                              >= 10 years is way too long
 # of certificates provided   1
 Certificate Revocation List  --
 OCSP URI                     --
                              NOT ok -- neither CRL nor OCSP URI provided
 OCSP stapling                not offered
 OCSP must staple extension   --
 DNS CAA RR (experimental)    not offered
 Certificate Transparency     --


 Testing HTTP header response @ "/" 

 HTTP Status Code             200 OK
 HTTP clock skew              0 sec from localtime
 Strict Transport Security    not offered
 Public Key Pinning           --
 Server banner                ZNC 1.9.x-git-77-47e633b2 - https://znc.in
 Application banner           --
 Cookie(s)                    1 issued: 1/1 secure, 1/1 HttpOnly
 Security headers             --
 Reverse Proxy banner         --


 Testing vulnerabilities 

 Heartbleed (CVE-2014-0160)                not vulnerable (OK), no heartbeat extension
 CCS (CVE-2014-0224)                       not vulnerable (OK)
 Ticketbleed (CVE-2016-9244), experiment.  not vulnerable (OK)
 ROBOT                                     not vulnerable (OK)
 Secure Renegotiation (RFC 5746)           supported (OK)
 Secure Client-Initiated Renegotiation     VULNERABLE (NOT ok), DoS threat
 CRIME, TLS (CVE-2012-4929)                not vulnerable (OK)
 BREACH (CVE-2013-3587)                    potentially NOT ok, "gzip" HTTP compression detected. - only supplied "/" tested
                                           Can be ignored for static pages or if no secrets in the page
 POODLE, SSL (CVE-2014-3566)               not vulnerable (OK), no SSLv3 support
 TLS_FALLBACK_SCSV (RFC 7507)              Downgrade attack prevention supported (OK)
 SWEET32 (CVE-2016-2183, CVE-2016-6329)    not vulnerable (OK)
 FREAK (CVE-2015-0204)                     not vulnerable (OK)
 DROWN (CVE-2016-0800, CVE-2016-0703)      not vulnerable on this host and port (OK)
                                           make sure you don't use this certificate elsewhere with SSLv2 enabled services
                                           https://censys.io/ipv4?q=xxxxx could help you to find out
 LOGJAM (CVE-2015-4000), experimental      not vulnerable (OK): no DH EXPORT ciphers, no common prime detected
 BEAST (CVE-2011-3389)                     
 TLS1:
Hexcode  Cipher Suite Name (OpenSSL)       KeyExch.   Encryption  Bits     Cipher Suite Name (IANA/RFC)
-----------------------------------------------------------------------------------------------------------------------------
 xc014   ECDHE-RSA-AES256-SHA              ECDH 253   AES         256      TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA                 
 x39     DHE-RSA-AES256-SHA                DH 2048    AES         256      TLS_DHE_RSA_WITH_AES_256_CBC_SHA                   
 x35     AES256-SHA                        RSA        AES         256      TLS_RSA_WITH_AES_256_CBC_SHA                       
 xc013   ECDHE-RSA-AES128-SHA              ECDH 253   AES         128      TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA                 
 x33     DHE-RSA-AES128-SHA                DH 2048    AES         128      TLS_DHE_RSA_WITH_AES_128_CBC_SHA                   
 x2f     AES128-SHA                        RSA        AES         128      TLS_RSA_WITH_AES_128_CBC_SHA                       

 VULNERABLE -- but also supports higher protocols (possible mitigation)  TLSv1.1 TLSv1.2

 LUCKY13 (CVE-2013-0169), experimental     potentially VULNERABLE, uses cipher block chaining (CBC) ciphers with TLS. Check patches
 Winshock (CVE-2014-6321), experimental    not vulnerable (OK)
 RC4 (CVE-2013-2566, CVE-2015-2808)        no RC4 ciphers detected (OK)


 Running client simulations (HTTP) via sockets 

 Browser                      Protocol  Cipher Suite Name (OpenSSL)       Forward Secrecy
------------------------------------------------------------------------------------------------
 Android 4.4.2                TLSv1.2   ECDHE-RSA-AES128-GCM-SHA256       256 bit ECDH (P-256)
 Android 5.0.0                TLSv1.2   ECDHE-RSA-AES128-GCM-SHA256       256 bit ECDH (P-256)
 Android 6.0                  TLSv1.2   ECDHE-RSA-AES128-GCM-SHA256       256 bit ECDH (P-256)
 Android 7.0 (native)         TLSv1.2   ECDHE-RSA-CHACHA20-POLY1305       256 bit ECDH (P-256)
 Android 8.1 (native)         TLSv1.2   ECDHE-RSA-CHACHA20-POLY1305       253 bit ECDH (X25519)
 Android 9.0 (native)         TLSv1.3   TLS_AES_256_GCM_SHA384            253 bit ECDH (X25519)
 Android 10.0 (native)        TLSv1.3   TLS_AES_256_GCM_SHA384            253 bit ECDH (X25519)
 Chrome 74 (Win 10)           TLSv1.3   TLS_AES_256_GCM_SHA384            253 bit ECDH (X25519)
 Chrome 79 (Win 10)           TLSv1.3   TLS_AES_256_GCM_SHA384            253 bit ECDH (X25519)
 Firefox 66 (Win 8.1/10)      TLSv1.3   TLS_AES_256_GCM_SHA384            253 bit ECDH (X25519)
 Firefox 71 (Win 10)          TLSv1.3   TLS_AES_256_GCM_SHA384            253 bit ECDH (X25519)
 IE 6 XP                      No connection
 IE 8 Win 7                   TLSv1.0   ECDHE-RSA-AES128-SHA              256 bit ECDH (P-256)
 IE 8 XP                      No connection
 IE 11 Win 7                  TLSv1.2   DHE-RSA-AES128-GCM-SHA256         2048 bit DH  
 IE 11 Win 8.1                TLSv1.2   DHE-RSA-AES128-GCM-SHA256         2048 bit DH  
 IE 11 Win Phone 8.1          TLSv1.2   ECDHE-RSA-AES128-SHA256           256 bit ECDH (P-256)
 IE 11 Win 10                 TLSv1.2   ECDHE-RSA-AES128-GCM-SHA256       256 bit ECDH (P-256)
 Edge 15 Win 10               TLSv1.2   ECDHE-RSA-AES128-GCM-SHA256       253 bit ECDH (X25519)
 Edge 17 (Win 10)             TLSv1.2   ECDHE-RSA-AES128-GCM-SHA256       253 bit ECDH (X25519)
 Opera 66 (Win 10)            TLSv1.3   TLS_AES_256_GCM_SHA384            253 bit ECDH (X25519)
 Safari 9 iOS 9               TLSv1.2   ECDHE-RSA-AES128-GCM-SHA256       256 bit ECDH (P-256)
 Safari 9 OS X 10.11          TLSv1.2   ECDHE-RSA-AES128-GCM-SHA256       256 bit ECDH (P-256)
 Safari 10 OS X 10.12         TLSv1.2   ECDHE-RSA-AES128-GCM-SHA256       256 bit ECDH (P-256)
 Safari 12.1 (iOS 12.2)       TLSv1.3   TLS_AES_256_GCM_SHA384            253 bit ECDH (X25519)
 Safari 13.0 (macOS 10.14.6)  TLSv1.3   TLS_AES_256_GCM_SHA384            253 bit ECDH (X25519)
 Apple ATS 9 iOS 9            TLSv1.2   ECDHE-RSA-AES128-GCM-SHA256       256 bit ECDH (P-256)
 Java 6u45                    No connection
 Java 7u25                    TLSv1.0   ECDHE-RSA-AES128-SHA              256 bit ECDH (P-256)
 Java 8u161                   TLSv1.2   ECDHE-RSA-AES128-GCM-SHA256       256 bit ECDH (P-256)
 Java 11.0.2 (OpenJDK)        TLSv1.3   TLS_AES_256_GCM_SHA384            256 bit ECDH (P-256)
 Java 12.0.1 (OpenJDK)        TLSv1.3   TLS_AES_256_GCM_SHA384            256 bit ECDH (P-256)
 OpenSSL 1.0.2e               TLSv1.2   ECDHE-RSA-AES128-GCM-SHA256       256 bit ECDH (P-256)
 OpenSSL 1.1.0l (Debian)      TLSv1.2   ECDHE-RSA-CHACHA20-POLY1305       253 bit ECDH (X25519)
 OpenSSL 1.1.1d (Debian)      TLSv1.3   TLS_AES_256_GCM_SHA384            253 bit ECDH (X25519)
 Thunderbird (68.3)           TLSv1.3   TLS_AES_256_GCM_SHA384            253 bit ECDH (X25519)


 Rating (experimental) 

 Rating specs (not complete)  SSL Labs's 'SSL Server Rating Guide' (version 2009q from 2020-01-30)
 Specification documentation  https://github.com/ssllabs/research/wiki/SSL-Server-Rating-Guide
 Protocol Support (weighted)  0 (0)
 Key Exchange     (weighted)  0 (0)
 Cipher Strength  (weighted)  0 (0)
 Final Score                  0
 Overall Grade                T
 Grade cap reasons            Grade capped to T. Issues with the chain of trust (self signed)
                              Grade capped to M. Domain name mismatch
                              Grade capped to B. TLS 1.1 offered
                              Grade capped to B. TLS 1.0 offered
                              Grade capped to A. HSTS is not offered

 Done 2020-09-24 03:10:55 [  67s] -->> 192.168.0.2:50000 (192.168.0.2) <<--

Nice that ZNC supports TLS1.3 on recent OpenSSL (https://github.com/znc/znc/issues/1512), but this Check shows Issues with:

TLS1.0 and TLS1.1 enabled
Obsoleted CBC ciphers (AES, ARIA etc.)
Secure Client-Initiated Renegotiation
BREACH (CVE-2013-3587)
LUCKY13 (CVE-2013-0169), experimental'

It would be nice if a default Install wont contain these Issues.

Playing around with https://github.com/drwetter/testssl.sh this Tool reports some Problems with the znc-webadmin and SSL: ``` 1.9.x-git-77-47e633b2 ./configure --prefix=$HOME --disable-cyrus --disable-ipv6 OpenSSL 1.1.1g 21 Apr 2020 +------------------------+ | ZNC 1.9.x configured | | | | Prefix : /home/bla | | SSL : yes | | IPv6 : no | | Async DNS : yes | | Perl : no | | Python : no | | Tcl : no | | Cyrus : no | | Charset : yes | | Zlib : yes | | i18n : yes | +------------------------+ ./testssl.sh --openssl /usr/bin/openssl --wide 192.168.0.2:50000 ########################################################### testssl.sh 3.1dev from https://testssl.sh/dev/ (3d07f55 2020-09-22 17:35:31 -- ) This program is free software. Distribution and modification under GPLv2 permitted. USAGE w/o ANY WARRANTY. USE IT AT YOUR OWN RISK! Please file bugs @ https://testssl.sh/bugs/ ########################################################### Using "OpenSSL 1.1.1g 21 Apr 2020" [~99 ciphers] on knecht:/usr/bin/openssl (built: "May 24 19:14:32 2020", platform: "linux-x86_64") Start 2020-09-24 03:09:50 -->> 192.168.0.2:50000 (192.168.0.2) <<-- rDNS (192.168.0.2): host. Service detected: HTTP Testing protocols via sockets except NPN+ALPN SSLv2 not offered (OK) SSLv3 not offered (OK) TLS 1 offered (deprecated) TLS 1.1 offered (deprecated) TLS 1.2 offered (OK) TLS 1.3 offered (OK): final NPN/SPDY not offered ALPN/HTTP2 not offered Testing cipher categories NULL ciphers (no encryption) not offered (OK) Anonymous NULL Ciphers (no authentication) not offered (OK) Export ciphers (w/o ADH+NULL) not offered (OK) LOW: 64 Bit + DES, RC[2,4], MD5 (w/o export) not offered (OK) Triple DES Ciphers / IDEA not offered Obsoleted CBC ciphers (AES, ARIA etc.) offered Strong encryption (AEAD ciphers) with no FS offered (OK) Forward Secrecy strong encryption (AEAD ciphers) offered (OK) Testing server's cipher preferences Has server cipher order? yes (OK) -- TLS 1.3 and below Negotiated protocol TLSv1.3 Negotiated cipher TLS_AES_256_GCM_SHA384, 253 bit ECDH (X25519) Cipher per protocol Hexcode Cipher Suite Name (OpenSSL) KeyExch. Encryption Bits Cipher Suite Name (IANA/RFC) ----------------------------------------------------------------------------------------------------------------------------- SSLv2 - SSLv3 - TLSv1 (server order) xc013 ECDHE-RSA-AES128-SHA ECDH 253 AES 128 TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA xc014 ECDHE-RSA-AES256-SHA ECDH 253 AES 256 TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA x33 DHE-RSA-AES128-SHA DH 2048 AES 128 TLS_DHE_RSA_WITH_AES_128_CBC_SHA x39 DHE-RSA-AES256-SHA DH 2048 AES 256 TLS_DHE_RSA_WITH_AES_256_CBC_SHA x2f AES128-SHA RSA AES 128 TLS_RSA_WITH_AES_128_CBC_SHA x35 AES256-SHA RSA AES 256 TLS_RSA_WITH_AES_256_CBC_SHA TLSv1.1 (server order) xc013 ECDHE-RSA-AES128-SHA ECDH 253 AES 128 TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA xc014 ECDHE-RSA-AES256-SHA ECDH 253 AES 256 TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA x33 DHE-RSA-AES128-SHA DH 2048 AES 128 TLS_DHE_RSA_WITH_AES_128_CBC_SHA x39 DHE-RSA-AES256-SHA DH 2048 AES 256 TLS_DHE_RSA_WITH_AES_256_CBC_SHA x2f AES128-SHA RSA AES 128 TLS_RSA_WITH_AES_128_CBC_SHA x35 AES256-SHA RSA AES 256 TLS_RSA_WITH_AES_256_CBC_SHA TLSv1.2 (server order) xcca8 ECDHE-RSA-CHACHA20-POLY1305 ECDH 253 ChaCha20 256 TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256 xc02f ECDHE-RSA-AES128-GCM-SHA256 ECDH 253 AESGCM 128 TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256 xc030 ECDHE-RSA-AES256-GCM-SHA384 ECDH 253 AESGCM 256 TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 x9e DHE-RSA-AES128-GCM-SHA256 DH 2048 AESGCM 128 TLS_DHE_RSA_WITH_AES_128_GCM_SHA256 x9f DHE-RSA-AES256-GCM-SHA384 DH 2048 AESGCM 256 TLS_DHE_RSA_WITH_AES_256_GCM_SHA384 xc027 ECDHE-RSA-AES128-SHA256 ECDH 253 AES 128 TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256 xc028 ECDHE-RSA-AES256-SHA384 ECDH 253 AES 256 TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384 xc013 ECDHE-RSA-AES128-SHA ECDH 253 AES 128 TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA xc014 ECDHE-RSA-AES256-SHA ECDH 253 AES 256 TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA x67 DHE-RSA-AES128-SHA256 DH 2048 AES 128 TLS_DHE_RSA_WITH_AES_128_CBC_SHA256 x33 DHE-RSA-AES128-SHA DH 2048 AES 128 TLS_DHE_RSA_WITH_AES_128_CBC_SHA x6b DHE-RSA-AES256-SHA256 DH 2048 AES 256 TLS_DHE_RSA_WITH_AES_256_CBC_SHA256 x39 DHE-RSA-AES256-SHA DH 2048 AES 256 TLS_DHE_RSA_WITH_AES_256_CBC_SHA x9c AES128-GCM-SHA256 RSA AESGCM 128 TLS_RSA_WITH_AES_128_GCM_SHA256 x9d AES256-GCM-SHA384 RSA AESGCM 256 TLS_RSA_WITH_AES_256_GCM_SHA384 x3c AES128-SHA256 RSA AES 128 TLS_RSA_WITH_AES_128_CBC_SHA256 x3d AES256-SHA256 RSA AES 256 TLS_RSA_WITH_AES_256_CBC_SHA256 x2f AES128-SHA RSA AES 128 TLS_RSA_WITH_AES_128_CBC_SHA x35 AES256-SHA RSA AES 256 TLS_RSA_WITH_AES_256_CBC_SHA TLSv1.3 (server order) x1302 TLS_AES_256_GCM_SHA384 ECDH 253 AESGCM 256 TLS_AES_256_GCM_SHA384 x1303 TLS_CHACHA20_POLY1305_SHA256 ECDH 253 ChaCha20 256 TLS_CHACHA20_POLY1305_SHA256 x1301 TLS_AES_128_GCM_SHA256 ECDH 253 AESGCM 128 TLS_AES_128_GCM_SHA256 Testing robust forward secrecy (FS) -- omitting Null Authentication/Encryption, 3DES, RC4 FS is offered (OK) , ciphers follow (client/browser support is important here) Hexcode Cipher Suite Name (OpenSSL) KeyExch. Encryption Bits Cipher Suite Name (IANA/RFC) ----------------------------------------------------------------------------------------------------------------------------- x1302 TLS_AES_256_GCM_SHA384 ECDH 253 AESGCM 256 TLS_AES_256_GCM_SHA384 x1303 TLS_CHACHA20_POLY1305_SHA256 ECDH 253 ChaCha20 256 TLS_CHACHA20_POLY1305_SHA256 xc030 ECDHE-RSA-AES256-GCM-SHA384 ECDH 253 AESGCM 256 TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 xc028 ECDHE-RSA-AES256-SHA384 ECDH 253 AES 256 TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384 xc014 ECDHE-RSA-AES256-SHA ECDH 253 AES 256 TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA x9f DHE-RSA-AES256-GCM-SHA384 DH 2048 AESGCM 256 TLS_DHE_RSA_WITH_AES_256_GCM_SHA384 xcca8 ECDHE-RSA-CHACHA20-POLY1305 ECDH 253 ChaCha20 256 TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256 x6b DHE-RSA-AES256-SHA256 DH 2048 AES 256 TLS_DHE_RSA_WITH_AES_256_CBC_SHA256 x39 DHE-RSA-AES256-SHA DH 2048 AES 256 TLS_DHE_RSA_WITH_AES_256_CBC_SHA x1301 TLS_AES_128_GCM_SHA256 ECDH 253 AESGCM 128 TLS_AES_128_GCM_SHA256 xc02f ECDHE-RSA-AES128-GCM-SHA256 ECDH 253 AESGCM 128 TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256 xc027 ECDHE-RSA-AES128-SHA256 ECDH 253 AES 128 TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256 xc013 ECDHE-RSA-AES128-SHA ECDH 253 AES 128 TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA x9e DHE-RSA-AES128-GCM-SHA256 DH 2048 AESGCM 128 TLS_DHE_RSA_WITH_AES_128_GCM_SHA256 x67 DHE-RSA-AES128-SHA256 DH 2048 AES 128 TLS_DHE_RSA_WITH_AES_128_CBC_SHA256 x33 DHE-RSA-AES128-SHA DH 2048 AES 128 TLS_DHE_RSA_WITH_AES_128_CBC_SHA Elliptic curves offered: prime256v1 secp384r1 secp521r1 X25519 X448 DH group offered: Unknown DH group (2048 bits) Testing server defaults (Server Hello) TLS extensions (standard) "renegotiation info/#65281" "EC point formats/#11" "session ticket/#35" "supported versions/#43" "key share/#51" "max fragment length/#1" "encrypt-then-mac/#22" "extended master secret/#23" Session Ticket RFC 5077 hint 7200 seconds, session tickets keys seems to be rotated < daily SSL Session ID support yes Session Resumption Tickets no, ID: no TLS clock skew Random values, no fingerprinting possible Signature Algorithm SHA256 with RSA Server key size RSA 2048 bits (exponent is 65537) Server key usage -- Server extended key usage -- Serial / Fingerprints 1C71 / SHA1 x SHA256 xxxxxxx Common Name (CN) host.unknown subjectAltName (SAN) missing (NOT ok) -- Browsers are complaining Issuer host.unknown Trust (hostname) certificate does not match supplied URI Chain of trust NOT ok (self signed) EV cert (experimental) no Bad OCSP intermediate (exp.) Ok ETS/"eTLS", visibility info not present Certificate Validity (UTC) 3649 >= 60 days (2020-09-24 02:52 --> 2030-09-22 02:52) >= 10 years is way too long # of certificates provided 1 Certificate Revocation List -- OCSP URI -- NOT ok -- neither CRL nor OCSP URI provided OCSP stapling not offered OCSP must staple extension -- DNS CAA RR (experimental) not offered Certificate Transparency -- Testing HTTP header response @ "/" HTTP Status Code 200 OK HTTP clock skew 0 sec from localtime Strict Transport Security not offered Public Key Pinning -- Server banner ZNC 1.9.x-git-77-47e633b2 - https://znc.in Application banner -- Cookie(s) 1 issued: 1/1 secure, 1/1 HttpOnly Security headers -- Reverse Proxy banner -- Testing vulnerabilities Heartbleed (CVE-2014-0160) not vulnerable (OK), no heartbeat extension CCS (CVE-2014-0224) not vulnerable (OK) Ticketbleed (CVE-2016-9244), experiment. not vulnerable (OK) ROBOT not vulnerable (OK) Secure Renegotiation (RFC 5746) supported (OK) Secure Client-Initiated Renegotiation VULNERABLE (NOT ok), DoS threat CRIME, TLS (CVE-2012-4929) not vulnerable (OK) BREACH (CVE-2013-3587) potentially NOT ok, "gzip" HTTP compression detected. - only supplied "/" tested Can be ignored for static pages or if no secrets in the page POODLE, SSL (CVE-2014-3566) not vulnerable (OK), no SSLv3 support TLS_FALLBACK_SCSV (RFC 7507) Downgrade attack prevention supported (OK) SWEET32 (CVE-2016-2183, CVE-2016-6329) not vulnerable (OK) FREAK (CVE-2015-0204) not vulnerable (OK) DROWN (CVE-2016-0800, CVE-2016-0703) not vulnerable on this host and port (OK) make sure you don't use this certificate elsewhere with SSLv2 enabled services https://censys.io/ipv4?q=xxxxx could help you to find out LOGJAM (CVE-2015-4000), experimental not vulnerable (OK): no DH EXPORT ciphers, no common prime detected BEAST (CVE-2011-3389) TLS1: Hexcode Cipher Suite Name (OpenSSL) KeyExch. Encryption Bits Cipher Suite Name (IANA/RFC) ----------------------------------------------------------------------------------------------------------------------------- xc014 ECDHE-RSA-AES256-SHA ECDH 253 AES 256 TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA x39 DHE-RSA-AES256-SHA DH 2048 AES 256 TLS_DHE_RSA_WITH_AES_256_CBC_SHA x35 AES256-SHA RSA AES 256 TLS_RSA_WITH_AES_256_CBC_SHA xc013 ECDHE-RSA-AES128-SHA ECDH 253 AES 128 TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA x33 DHE-RSA-AES128-SHA DH 2048 AES 128 TLS_DHE_RSA_WITH_AES_128_CBC_SHA x2f AES128-SHA RSA AES 128 TLS_RSA_WITH_AES_128_CBC_SHA VULNERABLE -- but also supports higher protocols (possible mitigation) TLSv1.1 TLSv1.2 LUCKY13 (CVE-2013-0169), experimental potentially VULNERABLE, uses cipher block chaining (CBC) ciphers with TLS. Check patches Winshock (CVE-2014-6321), experimental not vulnerable (OK) RC4 (CVE-2013-2566, CVE-2015-2808) no RC4 ciphers detected (OK) Running client simulations (HTTP) via sockets Browser Protocol Cipher Suite Name (OpenSSL) Forward Secrecy ------------------------------------------------------------------------------------------------ Android 4.4.2 TLSv1.2 ECDHE-RSA-AES128-GCM-SHA256 256 bit ECDH (P-256) Android 5.0.0 TLSv1.2 ECDHE-RSA-AES128-GCM-SHA256 256 bit ECDH (P-256) Android 6.0 TLSv1.2 ECDHE-RSA-AES128-GCM-SHA256 256 bit ECDH (P-256) Android 7.0 (native) TLSv1.2 ECDHE-RSA-CHACHA20-POLY1305 256 bit ECDH (P-256) Android 8.1 (native) TLSv1.2 ECDHE-RSA-CHACHA20-POLY1305 253 bit ECDH (X25519) Android 9.0 (native) TLSv1.3 TLS_AES_256_GCM_SHA384 253 bit ECDH (X25519) Android 10.0 (native) TLSv1.3 TLS_AES_256_GCM_SHA384 253 bit ECDH (X25519) Chrome 74 (Win 10) TLSv1.3 TLS_AES_256_GCM_SHA384 253 bit ECDH (X25519) Chrome 79 (Win 10) TLSv1.3 TLS_AES_256_GCM_SHA384 253 bit ECDH (X25519) Firefox 66 (Win 8.1/10) TLSv1.3 TLS_AES_256_GCM_SHA384 253 bit ECDH (X25519) Firefox 71 (Win 10) TLSv1.3 TLS_AES_256_GCM_SHA384 253 bit ECDH (X25519) IE 6 XP No connection IE 8 Win 7 TLSv1.0 ECDHE-RSA-AES128-SHA 256 bit ECDH (P-256) IE 8 XP No connection IE 11 Win 7 TLSv1.2 DHE-RSA-AES128-GCM-SHA256 2048 bit DH IE 11 Win 8.1 TLSv1.2 DHE-RSA-AES128-GCM-SHA256 2048 bit DH IE 11 Win Phone 8.1 TLSv1.2 ECDHE-RSA-AES128-SHA256 256 bit ECDH (P-256) IE 11 Win 10 TLSv1.2 ECDHE-RSA-AES128-GCM-SHA256 256 bit ECDH (P-256) Edge 15 Win 10 TLSv1.2 ECDHE-RSA-AES128-GCM-SHA256 253 bit ECDH (X25519) Edge 17 (Win 10) TLSv1.2 ECDHE-RSA-AES128-GCM-SHA256 253 bit ECDH (X25519) Opera 66 (Win 10) TLSv1.3 TLS_AES_256_GCM_SHA384 253 bit ECDH (X25519) Safari 9 iOS 9 TLSv1.2 ECDHE-RSA-AES128-GCM-SHA256 256 bit ECDH (P-256) Safari 9 OS X 10.11 TLSv1.2 ECDHE-RSA-AES128-GCM-SHA256 256 bit ECDH (P-256) Safari 10 OS X 10.12 TLSv1.2 ECDHE-RSA-AES128-GCM-SHA256 256 bit ECDH (P-256) Safari 12.1 (iOS 12.2) TLSv1.3 TLS_AES_256_GCM_SHA384 253 bit ECDH (X25519) Safari 13.0 (macOS 10.14.6) TLSv1.3 TLS_AES_256_GCM_SHA384 253 bit ECDH (X25519) Apple ATS 9 iOS 9 TLSv1.2 ECDHE-RSA-AES128-GCM-SHA256 256 bit ECDH (P-256) Java 6u45 No connection Java 7u25 TLSv1.0 ECDHE-RSA-AES128-SHA 256 bit ECDH (P-256) Java 8u161 TLSv1.2 ECDHE-RSA-AES128-GCM-SHA256 256 bit ECDH (P-256) Java 11.0.2 (OpenJDK) TLSv1.3 TLS_AES_256_GCM_SHA384 256 bit ECDH (P-256) Java 12.0.1 (OpenJDK) TLSv1.3 TLS_AES_256_GCM_SHA384 256 bit ECDH (P-256) OpenSSL 1.0.2e TLSv1.2 ECDHE-RSA-AES128-GCM-SHA256 256 bit ECDH (P-256) OpenSSL 1.1.0l (Debian) TLSv1.2 ECDHE-RSA-CHACHA20-POLY1305 253 bit ECDH (X25519) OpenSSL 1.1.1d (Debian) TLSv1.3 TLS_AES_256_GCM_SHA384 253 bit ECDH (X25519) Thunderbird (68.3) TLSv1.3 TLS_AES_256_GCM_SHA384 253 bit ECDH (X25519) Rating (experimental) Rating specs (not complete) SSL Labs's 'SSL Server Rating Guide' (version 2009q from 2020-01-30) Specification documentation https://github.com/ssllabs/research/wiki/SSL-Server-Rating-Guide Protocol Support (weighted) 0 (0) Key Exchange (weighted) 0 (0) Cipher Strength (weighted) 0 (0) Final Score 0 Overall Grade T Grade cap reasons Grade capped to T. Issues with the chain of trust (self signed) Grade capped to M. Domain name mismatch Grade capped to B. TLS 1.1 offered Grade capped to B. TLS 1.0 offered Grade capped to A. HSTS is not offered Done 2020-09-24 03:10:55 [ 67s] -->> 192.168.0.2:50000 (192.168.0.2) <<-- ``` Nice that ZNC supports TLS1.3 on recent OpenSSL (https://github.com/znc/znc/issues/1512), but this Check shows Issues with: `TLS1.0 and TLS1.1 enabled` `Obsoleted CBC ciphers (AES, ARIA etc.)` `Secure Client-Initiated Renegotiation` `BREACH (CVE-2013-3587)` `LUCKY13 (CVE-2013-0169), experimental'` It would be nice if a default Install wont contain these Issues. <!-- github-sync-id:707792675 -->
adam closed this issue 2026-10-05 04:55:45 +02:00
adam commented 2026-10-05 04:55:46 +02:00
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Looks like now only 'Secure Client-Initiated Renegotiation' is missing

Looks like now only 'Secure Client-Initiated Renegotiation' is missing <!-- github-comment-id:698227187 -->
adam commented 2026-10-05 04:55:47 +02:00
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Thank you.

Thank you. <!-- github-comment-id:699354881 -->
adam commented 2026-10-05 04:55:48 +02:00
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The rest is dupe of #1162

The rest is dupe of #1162 <!-- github-comment-id:699460673 -->
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Reference: adam/znc#963