The krb5_save_ccname_done function in providers/krb5/krb5_auth.c in System Security Services Daemon (SSSD) 1.5.x before 1.5.7, when automatic ticket renewal and offline authentication are configured, uses a pathname string as a password, which allows local users to bypass Kerberos authentication by listing the /tmp directory to obtain the pathname.

References

• https://nvd.nist.gov/vuln/detail/CVE-2011-1758
• https://bugzilla.redhat.com/show_bug.cgi?id=700867
• https://bugzilla.redhat.com/show_bug.cgi?id=700891
• https://fedorahosted.org/pipermail/sssd-devel/2011-April/006138.html
• https://fedorahosted.org/sssd/ticket/856
• https://fedorahosted.org/sssd/wiki/Releases/Notes-1.5.7
• http://git.fedorahosted.org/git/?p=sssd.git;a=commit;h=fffdae81651b460f3d2c119c56d5caa09b4de42a
• http://lists.fedoraproject.org/pipermail/package-announce/2011-May/059532.html
• http://lists.fedoraproject.org/pipermail/package-announce/2011-May/059619.html
• http://openwall.com/lists/oss-security/2011/04/29/4
• http://git.fedorahosted.org/git/?p=sssd.git%3Ba=commit%3Bh=fffdae81651b460f3d2c119c56d5caa09b4de42a