#VU45013 Improper Authentication in SSSD - CVE-2011-1758

Vulnerability identifier: #VU45013

Vulnerability risk: Medium

CVSSv4.0: 0.5 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2011-1758

CWE-ID: CWE-287

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
SSSD
Web applications / Remote management & hosting panels

Vendor: SSSD

Description

The vulnerability allows a remote non-authenticated attacker to read and manipulate data.

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.

Mitigation
Install update from vendor's website.

Vulnerable software versions

SSSD: 1.5.0 - 1.5.6.1

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External links
https://git.fedorahosted.org/git/?p=sssd.git;a=commit;h=fffdae81651b460f3d2c119c56d5caa09b4de42a
https://lists.fedoraproject.org/pipermail/package-announce/2011-May/059532.html
https://lists.fedoraproject.org/pipermail/package-announce/2011-May/059619.html
https://openwall.com/lists/oss-security/2011/04/29/4
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

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.