Microsoft Internet Explorer 11 CalculateImageImmunity listStyleImage use after free

CVSS Meta Temp Score
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CTI Interest Score
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3.7$0-$5k0.00

A vulnerability has been found in Microsoft Internet Explorer 11 (Web Browser) and classified as problematic. Affected by this vulnerability is the function CView::CalculateImageImmunity. The manipulation of the argument listStyleImage with an unknown input leads to a use after free vulnerability. The CWE definition for the vulnerability is CWE-416. Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code. As an impact it is known to affect availability.

The weakness was published 11/02/2016 by Berend-Jan Wever (SkyLined) as MSIE 11 MSHTML CView::CalculateImageImmunity use-after-free details as not defined mailinglist post (Full-Disclosure). It is possible to read the advisory at seclists.org. The vendor was not involved in the public release. The mailinglist post contains:

June 2014: This vulnerability was submitted to ZDI. July 2014: ZDI rejects the submission.
The attack can be launched remotely. The exploitation doesn't need any form of authentication. It demands that the victim is doing some kind of user interaction. Technical details and also a private exploit are known. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 04/07/2017). It is expected to see the exploit prices for this product decreasing in the near future. The advisory points out:
Setting the `listStyleImage` property of an Element object causes MSIE 11 to allocate 0x4C bytes for an "image context" structure, which contains a reference to the document object as well as a reference to the same `CMarkup` object as the document. When the element is removed from the document/document fragment, this image context is freed on the next "draw". However, the code continues to use the freed context almost immediately after it is freed.
This issue might affect other versions of Internet Explorer too.

A private exploit has been developed by Berend-Jan Wever. It is declared as proof-of-concept. The real existence of this vulnerability is still doubted at the moment.

Applying a patch is able to eliminate this problem. It is possible to mitigate the problem by applying the configuration setting Disable JavaScript. The best possible mitigation is suggested to be patching the affected component. The mailinglist post contains the following remark:

As far as can be determined, disabling JavaScript should prevent an attacker from triggering the vulnerable code path. (…) Unfortunately, my records of what happened after ZDI rejected the issue are patchy. It appears that I did not pursue reporting the issue anywhere else, but Microsoft does appear to have patched the issue, as I can no longer reproduce it.

Productinfo

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Vendor

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Version

License

Support

  • end of life

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB CVSS-B Score: 🔍
VulDB CVSS-BT Score: 🔍
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.3
VulDB Meta Temp Score: 3.7

VulDB Base Score: 4.3
VulDB Temp Score: 3.7
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Class: Use after free
CWE: CWE-416 / CWE-119
ATT&CK: Unknown

Local: No
Remote: Yes

Availability: 🔍
Access: Private
Status: Proof-of-Concept
Author: Berend-Jan Wever
Price Prediction: 🔍
Current Price Estimation: 🔍

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Patch
Status: 🔍

0-Day Time: 🔍

Config: Disable JavaScript

Timelineinfo

11/02/2016 🔍
11/03/2016 +1 days 🔍
04/07/2017 +155 days 🔍

Sourcesinfo

Vendor: microsoft.com

Advisory: MSIE 11 MSHTML CView::CalculateImageImmunity use-after-free details
Researcher: Berend-Jan Wever (SkyLined)
Status: Not defined
Disputed: 🔍
scip Labs: https://www.scip.ch/en/?labs.20161013

Entryinfo

Created: 11/03/2016 08:09
Updated: 04/07/2017 12:15
Changes: 11/03/2016 08:09 (54), 04/07/2017 12:15 (2)
Complete: 🔍

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