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Fix a low impact directory traversal bug

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A common pattern for checking directories in ZNC is the following:

	sAbsolutePath = CDir::ChangeDir(sAllowedPath, sFile);
	if (sAbsolutePath.Left(sAllowedPath.length()) != sAllowedPath)
		Error;

But there is a problem: If sAllowedPath doesn't end with a slash, we are
vulnerable to an attack. If e.g. sAllowedPath = "/foo/bar", then
sFile = "../bartender" would result in sAbsolutePath = "/foo/bartender". Since
this path does begin with sAllowedPath, the code allowed it.

There shouldn't be any places where this can be exploited currently, but it is
still a security bug (path traversal).


git-svn-id: https://znc.svn.sourceforge.net/svnroot/znc/trunk@1569 726aef4b-f618-498e-8847-2d620e286838
This commit is contained in:
psychon
2009-07-21 18:36:33 +00:00
parent 4495a6c2e0
commit c7583c4946
6 changed files with 23 additions and 10 deletions
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HTTPSock.cpp
+2 -2
View File
@@ -119,9 +119,9 @@ bool CHTTPSock::PrintFile(const CString& sFileName, CString sContentType) {
if (!m_sDocRoot.empty()) {
sFilePath.TrimLeft("/");
sFilePath = CDir::ChangeDir(m_sDocRoot, sFilePath, m_sDocRoot);
sFilePath = CDir::CheckPathPrefix(m_sDocRoot, sFilePath, m_sDocRoot);
if (sFilePath.Left(m_sDocRoot.size()) != m_sDocRoot) {
if (sFilePath.empty()) {
PrintErrorPage(403, "Forbidden", "You don't have permission to access that file on this server.");
DEBUG("THIS FILE: [" << sFilePath << "] does not live in ...");
DEBUG("DOCUMENT ROOT: [" << m_sDocRoot << "]");