#VU43773 Input validation error in Kerberos 5 - CVE-2012-1015

Vulnerability identifier: #VU43773

Vulnerability risk: High

CVSSv4.0: 8.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2012-1015

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 non-authenticated attacker to execute arbitrary code.

The kdc_handle_protected_negotiation function in the Key Distribution Center (KDC) in MIT Kerberos 5 (aka krb5) 1.8.x, 1.9.x before 1.9.5, and 1.10.x before 1.10.3 attempts to calculate a checksum before verifying that the key type is appropriate for a checksum, which allows remote attackers to execute arbitrary code or cause a denial of service (uninitialized pointer free, heap memory corruption, and daemon crash) via a crafted AS-REQ request.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Kerberos 5: 1.8 - 1.10.2

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External links
https://lists.opensuse.org/opensuse-updates/2012-08/msg00016.html
https://rhn.redhat.com/errata/RHSA-2012-1131.html
https://web.mit.edu/kerberos/advisories/MITKRB5-SA-2012-001.txt
https://www.debian.org/security/2012/dsa-2518
https://www.mandriva.com/security/advisories?name=MDVSA-2012:120

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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.