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Insecure Library Loading
Highly critical

Windows DNS Resolution Code Execution Vulnerabilities

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Description


Some vulnerabilities have been reported in Microsoft Windows, which can be exploited by malicious people to compromise a vulnerable system.

1) A boundary error in the Remote Access AutoDial Helper library (rasadhlp.dll) when performing hostname look-ups can be exploited to cause a stack-based buffer overflow via an overly long string.

Successful exploitation allows execution of arbitrary code when a user e.g. visits a malicious website.

2) Some errors exists in the DNS Client service when processing DNS responses. This can be exploited to corrupt memory by returning a DNS response with a specially crafted "TXT", "HINFO", "X25", "ISDN", or "ATMA" record.

Successful exploitation allows execution of arbitrary code.


Solution:
Apply patches.

Further details available to Secunia VIM customers

Provided and/or discovered by:
1) Peter Winter Smith, NGS Software.
2) ISS X-Force

Original Advisory:
MS06-041 (KB920683):
http://www.microsoft.com/technet/security/Bulletin/MS06-041.mspx

NGSSoftware:
http://www.ngssoftware.com/advisories/high-risk-vulnerability-in-microsoft-windows-dns-resolution/

ISS X-Force:
http://xforce.iss.net/xforce/alerts/id/233
http://xforce.iss.net/xforce/alerts/id/234
http://xforce.iss.net/xforce/alerts/id/235

Deep Links:
Links available to Secunia VIM customers

Do you have additional information related to this advisory?

Please provide information about patches, mitigating factors, new versions, exploits, faulty patches, links, and other relevant data by posting comments to this Advisory. You can also send this information to vuln@secunia.com

Subject: Windows DNS Resolution Code Execution Vulnerabilities

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