CVE-2014-4141
Description
Microsoft Internet Explorer 8 through 11 allows remote attackers to execute arbitrary code or cause a denial of service (memory corruption) via a crafted web site, aka "Internet Explorer Memory Corruption Vulnerability."
Predictions
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
No mitigations published for this CVE yet.
The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.
✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here withsource_tier=community-verified.
Exploits
Public proof-of-concept code below. AS-IS, for defenders and authorised testing only.
Exploit-DB
Microsoft Internet Explorer 9 - MSHTML CAttrArray Use-After-Free (MS14-056)
<!--
Source: http://blog.skylined.nl/20161101001.html
Synopsis
A specially crafted webpage can cause Microsoft Internet Explorer 9 to reallocate a memory buffer in order to grow it in size. The original buffer will be copied to newly allocated memory and then freed. The code continues to use the freed copy of the buffer.
Known affected versions, attack vectors and mitigations
Microsoft Internet Explorer 9
An attacker would need to get a target user to open a specially crafted webpage. Disabling JavaScript should prevent an attacker from triggering the vulnerable code path.
-->
<!doctype html>
<script>
oTextArea = document.createElement('textarea');
oTextArea.dataSrc = 1;
oTextArea.id = 1;
oTextArea.innerHTML = 1;
oTextArea.onvolumechange = 1;
oTextArea.style.setProperty('list-style', "url()");
</script>
<!--
Analysis
The CAttrArray object initially allocates a CImplAry buffer of 0x40 bytes, which can store 4 attributes. When the buffer is full, it is grown to 0x60 bytes. A new buffer is allocated at a different location in memory and the contents of the original buffer is copied there. The repro causes the code to do this, but the code continues to access the original buffer after it has been freed.
Exploit
If an attacker was able to cause MSIE to allocate 0x40 bytes of memory and have some control over the contents of this memory before MSIE reuses the freed memory, there is a chance that this issue could be used to execute arbitrary code. I did not attempt to write an exploit for this vulnerability myself.
Timeline
- April 2014: This vulnerability was found through fuzzing.
- July 2014: This vulnerability was submitted to ZDI.
- July 2014: ZDI reports a collision with a report by another researcher. (From the credits given by Microsoft and ZDI, I surmise that it was Peter 'corelanc0d3r' Van Eeckhoutte of Corelan who reported this issue.
- October 2014: Microsoft release MS14-056, which addresses this issue.
- November 2016: Details of this issue are released.
-->Application impact
| Vendor | Product | Versions | Fixed |
|---|---|---|---|
| microsoft | internet_explorer | 8 | |
| microsoft | internet_explorer | 9 | |
| microsoft | internet_explorer | 10 | |
| microsoft | internet_explorer | 11 | |
References
- http://secunia.com/advisories/60968
- http://www.securityfocus.com/bid/70342
- http://www.securitytracker.com/id/1031018
- https://docs.microsoft.com/en-us/security-updates/securitybulletins/2014/ms14-056
- https://www.exploit-db.com/exploits/40685/
- http://secunia.com/advisories/60968
- http://www.securityfocus.com/bid/70342
- http://www.securitytracker.com/id/1031018
- https://docs.microsoft.com/en-us/security-updates/securitybulletins/2014/ms14-056
- https://www.exploit-db.com/exploits/40685/
CWEs
CWE-119
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.