Microsoft Internet Explorer 10 MSHTML GetPlainTextInScope memory corruption

Summaryinfo

A vulnerability described as critical has been identified in Microsoft Internet Explorer 10. This affects the function CElement::GetPlainTextInScope of the component MSHTML Handler. Such manipulation leads to memory corruption. The attack can be executed remotely. There is not any exploit available. A patch should be applied to remediate this issue.

Detailsinfo

A vulnerability was found in Microsoft Internet Explorer 10 (Web Browser). It has been rated as critical. Affected by this issue is the function CElement::GetPlainTextInScope of the component MSHTML Handler. The manipulation with an unknown input leads to a memory corruption vulnerability. Using CWE to declare the problem leads to CWE-119. The product performs operations on a memory buffer, but it can read from or write to a memory location that is outside of the intended boundary of the buffer. Impacted is confidentiality, integrity, and availability.

The weakness was released 11/03/2016 by Berend-Jan Wever (SkyLined) as MSIE 10 MSHTML CElement::GetPlainTextInScope out-of-bounds read as not defined mailinglist post (Full-Disclosure). The advisory is available at seclists.org. The vendor was not involved in the coordination of the public release. The attack may be launched remotely. No form of authentication is required for exploitation. Successful exploitation requires user interaction by the victim. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $5k-$25k 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 illustrates:

The above suggests that there is limit opportunity for exploiting this issue: it may be possible to determine if a memory block allocated for a string of an attacker controlled size is followed by a memory block that starts with the bytes `0A 00`. To better understand the impact, one would have to get an older version of MSIE 10 and debug the crash. Unfortunately, I did not have time to do so.

Applying a patch is able to eliminate this problem.

If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Type

• Web Browser

Vendor

• Microsoft

Name

• Internet Explorer

Version

• 10

License

• commercial

Support

• end of life

Website

• Vendor: https://www.microsoft.com/

CPE 2.3info

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CPE 2.2info

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Entryinfo

If you want to get best quality of vulnerability data, you may have to visit VulDB.

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