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Microsoft Windows ASN.1 Library Integer Overflow Vulnerabilities
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Secunia Advisory:
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SA10759
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Release Date:
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2004-02-10
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Last Update:
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2005-04-25
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Popularity:
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26,146 views
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Critical:
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Highly critical
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Impact:
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System access
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Where:
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From remote
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Solution Status:
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Vendor Patch
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| OS: | Microsoft Windows 2000 Advanced Server
Microsoft Windows 2000 Datacenter Server
Microsoft Windows 2000 Professional
Microsoft Windows 2000 Server
Microsoft Windows NT 4.0 Server
Microsoft Windows NT 4.0 Server, Terminal Server Edition
Microsoft Windows NT 4.0 Workstation
Microsoft Windows Server 2003 Datacenter Edition
Microsoft Windows Server 2003 Enterprise Edition
Microsoft Windows Server 2003 Standard Edition
Microsoft Windows Server 2003 Web Edition
Microsoft Windows XP Embedded
Microsoft Windows XP Home Edition
Microsoft Windows XP Professional
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Instant alerts on relevant vulnerabilities 
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| | CVE reference: | CVE-2003-0818
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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.
Microsoft Windows NT Workstation 4.0 (requires SP6a):
http://www.microsoft.com/downloads/de...-98D4-F134849F5249&displaylang=en
Microsoft Windows NT Server 4.0 (requires SP6a):
http://www.microsoft.com/downloads/de...-8F54-58527932B588&displaylang=en
Microsoft Windows NT Server 4.0 Terminal Server Edition (requires SP6):
http://www.microsoft.com/downloads/de...-B406-A225AED0D659&displaylang=en
Microsoft Windows 2000 (requires SP2, SP3, or SP4):
http://www.microsoft.com/downloads/de...-A8C6-A2E663A53698&displaylang=en
Microsoft Windows XP (optionally SP1):
http://www.microsoft.com/downloads/de...-ACD0-1343D89CCBBA&displaylang=en
Microsoft Windows XP 64-Bit Edition (optionally SP1):
http://www.microsoft.com/downloads/de...-9C2C-0577118A1E68&displaylang=en
Microsoft Windows XP 64-Bit Edition Version 2003 (optionally SP1):
http://www.microsoft.com/downloads/de...-958F-E178C3F61F7C&displaylang=en
Microsoft Windows XP Embedded (requires SP1):
http://download.microsoft.com/downloa...3d62ddc16/Q828028_XPE_SP2_X86_ENU.EXE
Microsoft Windows Server 2003:
http://www.microsoft.com/downloads/de...-90E7-283732B2E117&displaylang=en
Microsoft Windows Server 2003 64-Bit Edition:
http://www.microsoft.com/downloads/de...-958F-E178C3F61F7C&displaylang=en
Provided and/or discovered by:
Derek Soeder, eEye Digital Security.
Changelog:
2004-03-02: Added Windows XP Embedded.
2005-04-25: Added link to detailed information about ASN.1 vulnerability.
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/de...bd99494f0&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/
Other References:
Microsoft KB Article 252648 - A Brief Introduction to ASN.1 and BER:
http://support.microsoft.com/default.aspx?scid=kb;en-us;252648
CERT VU#583108:
http://www.kb.cert.org/vuls/id/583108
CERT VU#216324:
http://www.kb.cert.org/vuls/id/216324
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Please note: The information that this Secunia Advisory is based on comes from a third party unless stated otherwise.
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