Microsoft Security Advisory: Vulnerability in Internet Explorer Could Allow Remote Code Execution (2887505)

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Details
Vulnerability name/brief description Microsoft Security Advisory: Vulnerability in Internet Explorer Could Allow Remote Code Execution (2887505)
CVE/CAN name
Vendor threat level No vendor threat level found
SophosLabs threat level Critical
Solution MS13-080
Vendor description Microsoft is investigating public reports of a vulnerability in all supported versions of Internet Explorer. Microsoft is aware of targeted attacks that attempt to exploit this vulnerability in Internet Explorer 8 and Internet Explorer 9. Applying the Microsoft Fix it solution, "CVE-2013-3893 MSHTML Shim Workaround," prevents the exploitation of this issue. See the Suggested Actions section of this advisory for more information. The vulnerability is a remote code execution vulnerability. The vulnerability exists in the way that Internet Explorer accesses an object in memory that has been deleted or has not been properly allocated. The vulnerability may corrupt memory in a way that could allow an attacker to execute arbitrary code in the context of the current user within Internet Explorer. An attacker could host a specially crafted website that is designed to exploit this vulnerability through Internet Explorer and then convince a user to view the website.
SophosLabs comments SophosLabs recommends that customers apply the workarounds described in the Microsoft advisory for now and when an update is released for this vulnerability apply it as soon as possible.
SophosLabs testing result No SophosLabs testing result found
Currently known exploits
First sample seen No samples found
Discovery date 17 Sep 2013
Affected software Internet Explorer 8
Internet Explorer 9
potentially all supported versions of Internet Explorer
References
Credits
  • MAPP
Revisions
  • September 17, 2013 - Initial analysis written
  • October 8, 2013 - Update for available patch

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.