MS13-006 - Vulnerability in Microsoft Windows Could Allow Security Feature Bypass (2785220)

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Details
Vulnerability name/brief description MS13-006 - Vulnerability in Microsoft Windows Could Allow Security Feature Bypass (2785220)
CVE/CAN name
Vendor threat level Important
SophosLabs threat level High
Solution MS13-006
Vendor description This security update resolves a privately reported vulnerability in the implementation of SSL and TLS in Microsoft Windows. The vulnerability could allow security feature bypass if an attacker intercepts encrypted web traffic handshakes.
SophosLabs comments This vulnerability can be exploited using a man-in-the-middle scenario. An encrypted session can be silently downgraded to a weaker cryptographic scheme if the attacker sends a specially crafted packet. The end user would not be aware of this downgrade.
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 Jan 2013
Affected software Windows Vista Service Pack 2
Windows Vista x64 Edition Service Pack 2
Windows Server 2008 for 32-bit Systems Service Pack 2
Windows Server 2008 for x64-based Systems Service Pack 2
Windows Server 2008 for Itanium-based Systems Service Pack 2
Windows 7 for 32-bit Systems No Service Pack and Service Pack 1
Windows 7 for x64-based Systems No Service Pack and Service Pack 1
Windows Server 2008 R2 for x64-based Systems No Service Pack and Service Pack 1
Windows Server 2008 R2 for Itanium-based Systems No Service Pack and Service Pack 1
Windows 8 for 32-bit Systems
Windows 8 for 64-bit Systems
Windows Server 2012
Windows RT
Windows Server 2008 for 32-bit Systems Service Pack 2 (Server Core installation)
Windows Server 2008 for x64-based Systems Service Pack 2 (Server Core installation)
Windows Server 2008 R2 for x64-based Systems No Service Pack and Service Pack 1 (Server Core installation)
Windows Server 2012 (Server Core installation)

References
Credits
  • MAPP
Revisions
  • January 8, 2013 - 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:

Vendor-supplied Patch identifier and recommended solution, or workaround if applicable.

Vendor Description:

Summary of the cause and potential effect of the vulnerability provided by the vendor.

SophosLabs Comments:

SophosLabs' opinions and observations of the vulnerability in question.

SophosLabs Testing Result:

Details of completed lab testing, if applicable. Please note that the lab test environment may differ significantly from user environments.

Currently Known Exploits:

List of identities for known exploits, if applicable.

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.