MS13-029 - Vulnerability in Remote Desktop Client Could Allow Remote Code Execution (2828223)

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Details
Vulnerability name/brief description MS13-029 - Vulnerability in Remote Desktop Client Could Allow Remote Code Execution (2828223)
CVE/CAN name
Vendor threat level Critical
SophosLabs threat level High
Solution MS13-029
Vendor description This security update resolves a privately reported vulnerability in Windows Remote Desktop Client. The vulnerability could allow remote code execution if a user visits a specially crafted webpage that is designed to exploit this vulnerability. The attacker could also take advantage of compromised websites and websites that accept or host user-provided content or advertisements. These websites could contain specially crafted content that could exploit this vulnerability. In all cases, however, an attacker would have no way to force users to view the attacker-controlled content. Instead, an attacker would have to convince users to take action, typically by getting them to click a link in an email message or in an Instant Messenger message that takes users to the attacker's website, or by getting them to open an attachment sent through email.
SophosLabs comments The vulnerability lies in mstscax.dll (RDP component). When mstscax.dll attempts to access a deleted object, the process may crash causing memory corruption.
SophosLabs testing result No SophosLabs testing result found
Currently known exploits No currently known exploits found
First sample seen No samples found
Discovery date 09 Apr 2013
Affected software Windows XP Service Pack 3 Remote Desktop Connection 6.1 Client
Windows XP Service Pack 3 (Excluding Tablet PC Edition 2005 Service Pack 3) Remote Desktop Connection 7.0 Client
Windows XP Professional x64 Edition Service Pack 2 Remote Desktop Connection 6.1 Client
Windows Server 2003 Service Pack 2 Remote Desktop Connection 6.1 Client
Windows Server 2003 x64 Edition Service Pack 2 Remote Desktop Connection 6.1 Client
Windows Vista Service Pack 2 Remote Desktop Connection 6.1 Client
Windows Vista Service Pack 2 Remote Desktop Connection 7.0 Client
Windows Vista x64 Edition Service Pack 2 Remote Desktop Connection 6.1 Client
Windows Vista x64 Edition Service Pack 2 Remote Desktop Connection 7.0 Client
Windows Server 2008 for 32-bit Systems Service Pack 2 Remote Desktop Connection 6.1 Client
Windows Server 2008 for 32-bit Systems Service Pack 2 Remote Desktop Connection 7.0 Client
Windows Server 2008 for x64-based Systems Service Pack 2 Remote Desktop Connection 6.1 Client
Windows Server 2008 for x64-based Systems Service Pack 2 Remote Desktop Connection 7.0 Client
Windows Server 2008 for Itanium-based Systems Service Pack 2 Remote Desktop Connection 6.1 Client
Windows 7 for 32-bit Systems Remote Desktop Connection 7.0 Client
Windows 7 for 32-bit Systems Service Pack 1 Remote Desktop Connection 7.0 Client
Windows 7 for x64-based Systems Remote Desktop Connection 7.0 Client
Windows 7 for x64-based Systems Service Pack 1 Remote Desktop Connection 7.0 Client
Windows Server 2008 R2 for x64-based Systems Remote Desktop Connection 7.0 Client
Windows Server 2008 R2 for x64-based Systems Service Pack 1 Remote Desktop Connection 7.0 Client
Windows Server 2008 R2 for Itanium-based Systems Remote Desktop Connection 7.0 Client
Windows Server 2008 R2 for Itanium-based Systems Service Pack 1 Remote Desktop Connection 7.0 Client
References
Credits
  • MAPP
Revisions
  • April 9, 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.