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Message-ID: <20131202212442.GX2523@redhat.com> Date: Mon, 2 Dec 2013 14:24:42 -0700 From: Vincent Danen <vdanen@...hat.com> To: oss-security@...ts.openwall.com Subject: CVE request: samba pam_winbind authentication fails open Just cutting-and-pasting from the bug I just filed. The following was reported to us, but had been reported upstream last year. It was reported [1] that Samba's pam_winbind module would fail open (allowing access) when the require_membership_of option is used as an argument to pam_winbind, and contains a non-existent group as the value. In such a configuration, rather then failing and not permitting authentication which is what would be expected, pam_winbind will allow authentication to proceed. For instance, if the following is specified and the user is not a member of the group 'Admin', they will not obtain access to the system: auth sufficient pam_winbind.so use_first_pass require_membership_of=Admin On the other hand, if the non-existent group 'AdminOops' is specified, the user is obviously not a member of said group, authentication will be permitted: auth sufficient pam_winbind.so use_first_pass require_membership_of=AdminOops The commit [2] that most likely introduced this flaw indicates that this was introduced October 2009 and another commit [3] looks like the fix, although that is for another bug [4] that's somewhat related to this issue and somewhat not. [1] https://lists.samba.org/archive/samba-technical/2012-June/084593.html [2] http://git.samba.org/?p=samba.git;a=commit;h=31f1a36901b5b8959dc51401c09c114829b50392 [3] http://git.samba.org/?p=samba.git;a=commitdiff;h=f62683956a3b182f6a61cc7a2b4ada2e74cde243 [4] https://bugzilla.samba.org/show_bug.cgi?id=8598 Could a CVE be assigned to this issue? -- Vincent Danen / Red Hat Security Response Team
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