MS13-103 - Vulnerability in ASP.NET SignalR Could Allow Elevation of Privilege (2905244)

Click any highlighted term for further explanation. For more information, contact technical support.

 

Details
Vulnerability name/brief description MS13-103 - Vulnerability in ASP.NET SignalR Could Allow Elevation of Privilege (2905244)
CVE/CAN name
Vendor threat level Important
SophosLabs threat level Medium
Solution MS13-103
Vendor description This security update resolves a privately reported vulnerability in ASP.NET SignalR. The vulnerability could allow elevation of privilege if an attacker reflects specially crafted JavaScript back to the browser of a targeted user. The security update addresses the vulnerability by ensuring that ASP.NET SignalR properly encodes user input.
SophosLabs comments As this vulnerability was privately reported via responsible disclosure, SophosLabs expects the impact of this exploit to be mitigated. Nevertheless, as the vulnerability can be exploited by browsing a website that is hosting ASP.NET SignalR, SophosLabs actively encourages users to apply the update as soon as it is available.
SophosLabs testing result No SophosLabs testing result found
Currently known exploits No currently known exploits found
First sample seen No samples found
Discovery date 10 Dec 2013
Affected software ASP.NET SignalR 1.1.x
ASP.NET SignalR 2.0.x
Microsoft Visual Studio Team Foundation Server 2013
References
Credits
  • MAPP
Revisions
  • December 10, 2013 - Initial Revision 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.