While working on my Authen::Smb wrapper, which provides SMB authentication to UNIX hosts via perl, I discovered that the library that it is based on, smbvalid.a (originally written by Alexander O. Yuriev, patched by many folks through time -- available from a number of places via http/ftp), has a number of exploitable buffer overflows. The username and password arrays, among others, are vulnerable to overflow. Remotely accessible applications that rely on the smbvalid library for authentication may be vulnerable to remote attack. At this time, Apache::AuthenSmb, a mod_perl-based authentication module for Apache, is the only formal application I am aware of that is vulnerable. Custom developed applications should be examined for possible vulnerabilities. Authen::Smb 0.9 has been released which addresses this problem and is available via CPAN. pam_smb, which is also built around smbvalid, does _not_ apper to be vulnerable to attacks. No patches are available to correct the problem in the library itself at this time. Thanks, -- Patrick Michael Kane We Also Walk Dogs <pmkat_private>
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