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Insecure Library Loading
Highly critical

Microsoft Windows ASN.1 Library Integer Overflow Vulnerabilities

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Description


eEye Digital Security has discovered some vulnerabilities in Microsoft Windows, which can be exploited by malicious people to compromise a vulnerable system.

The vulnerabilities are caused due to boundary errors in the Microsoft ASN.1 Library ("msasn1.dll") during ASN.1 BER decoding. These can be exploited via various security services (e.g. Kerberos and NTLMv2 authentication) and applications using certificates to cause a buffer overflow by sending malformed ASN.1 data to the service or application.

Successful exploitation may allow execution of arbitrary code on an affected system with SYSTEM privileges.


Solution:
Apply update automatically via WindowsUpdate or manually.

Further details available to Secunia VIM customers

Provided and/or discovered by:
Derek Soeder, eEye Digital Security.

Original Advisory:
MS04-007 - ASN.1 Vulnerability Could Allow Code Execution:
http://www.microsoft.com/technet/security/bulletin/MS04-007.asp

Microsoft Windows XP Embedded Security Bulletin:
http://www.microsoft.com/downloads/details.aspx?familyid=b11ce242-986e-44eb-b0ba-48cbd99494f0&displaylang=en#filelist

Microsoft ASN.1 Library Length Overflow Heap Corruption:
http://www.eeye.com/html/Research/Advisories/AD20040210.html

Microsoft ASN.1 Library Bit String Heap Corruption:
http://www.eeye.com/html/Research/Advisories/AD20040210-2.html

Solar Eclipse:
http://www.phreedom.org/solar/exploits/msasn1-bitstring/

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: Microsoft Windows ASN.1 Library Integer Overflow Vulnerabilities

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