#VU42349 Input validation error in Kerberos 5 - CVE-2013-1417

Vulnerability identifier: #VU42349

Vulnerability risk: Low

CVSSv4.0: 1.2 [CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2013-1417

CWE-ID: CWE-20

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Kerberos 5
Client/Desktop applications / Software for system administration

Vendor: MIT

Description

The vulnerability allows a remote #AU# to perform service disruption.

do_tgs_req.c in the Key Distribution Center (KDC) in MIT Kerberos 5 (aka krb5) 1.11 before 1.11.4, when a single-component realm name is used, allows remote authenticated users to cause a denial of service (daemon crash) via a TGS-REQ request that triggers an attempted cross-realm referral for a host-based service principal.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Kerberos 5: 1.11 - 1.11.3

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External links
https://lists.opensuse.org/opensuse-updates/2013-12/msg00026.html
https://web.mit.edu/kerberos/krb5-1.11/README-1.11.4.txt
https://bugzilla.redhat.com/show_bug.cgi?id=1030743
https://github.com/krb5/krb5/commit/4c023ba43c16396f0d199e2df1cfa59b88b62acc

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated privileged user via the Internet.

Is there known malware, which exploits this vulnerability?

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