MS12-069 - Vulnerability in Kerberos Could Allow Denial of Service (2743555)

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Details
Vulnerability name/brief description MS12-069 - Vulnerability in Kerberos Could Allow Denial of Service (2743555)
CVE/CAN name
Vendor threat level Important
SophosLabs threat level Medium
Solution MS12-069
Vendor description This security update resolves a privately reported vulnerability in Microsoft Windows. The vulnerability could allow denial of service if a remote attacker sends a specially crafted session request to the Kerberos server. Firewall best practices and standard default firewall configurations can help protect networks from attacks that originate outside the enterprise perimeter. Best practices recommend that systems that are connected to the Internet have a minimal number of ports exposed.
SophosLabs comments This privately reported denial of service vulnerability exists is due to the way a pointer is being dereferenced inside the Kerberos authentication package. While the vulnerability may not allow an attacker to gain access to the system, it can be used alternatively as a Denial of Service attack vector to generate an exception in a critical system process, causing the system to restart, thereby disrupting the system's operation. As this vulnerability was responsibly disclosed through coordinated efforts and no reports of this vulnerability have been received, SophosLabs expects this exploit to be mitigated.
SophosLabs testing result No SophosLabs testing result found
Currently known exploits No currently known exploits found
First sample seen No samples found
Discovery date 08 Oct 2012
Affected software Windows 7 for 32-bit Systems
Windows 7 for 32-bit Systems Service Pack 1
Windows 7 for x64-based Systems
Windows 7 for x64-based Systems Service Pack 1
Windows Server 2008 R2 for x64-based Systems
Windows Server 2008 R2 for x64-based Systems Service Pack 1
Windows Server 2008 R2 for Itanium-based Systems
Windows Server 2008 R2 for Itanium-based Systems Service Pack 1
Windows Server 2008 R2 for x64-based Systems (Server Core installation)
Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation)
References
Credits
  • MAPP
Revisions
  • Oct 8, 2012 - Initial analysis written

Explanation of terms

Vulnerability Name/Brief Description:

Vendor identifier plus a brief description of the type of attack.

CVE/CAN Name:

Currently assigned CVE name. If a CVE name doesn't exist the CAN name will be used until a CVE has been assigned.

Vendor Threat Level:

Threat level assigned by the vendor

SophosLabs Threat Level:

Threat level assigned by SophosLabs

  • LOW RISK - There is little chance of this vulnerability being actively exploited by malware.
  • MEDIUM RISK - There is a possibility of this vulnerability being actively exploited by malware.
  • HIGH RISK - There is a strong possibility of this vulnerability being actively exploited by malware.
  • CRITICAL RISK - This vulnerability will almost certainly be actively exploited by malware.

Solution:

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Vendor Description:

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SophosLabs Comments:

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SophosLabs Testing Result:

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Currently Known Exploits:

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First Sample Seen:

Date of the first sample seen by SophosLabs.

Discovery Date:

Date of the earliest known publically disclosed advisory.

Affected Software:

Vulnerable platforms and software versions.