Microsoft Windows NT 4.0/2000/XP/Server 2003 ASN.1 lsass.exe BER Decoding integer coercion

CVSS Meta Temp Score
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CTI Interest Score
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7.0$0-$5k0.00

Summaryinfo

A vulnerability was found in Microsoft Windows NT 4.0/2000/XP/Server 2003 and classified as very critical. This affects an unknown part in the library msasn1.dll of the file lsass.exe of the component ASN.1. Executing a manipulation as part of BER Decoding can lead to integer coercion. This vulnerability appears as CVE-2003-0818. The attack may be performed from remote. In addition, an exploit is available. It is advisable to implement a patch to correct this issue.

Detailsinfo

A vulnerability has been found in Microsoft Windows NT 4.0/2000/XP/Server 2003 (Operating System) and classified as very critical. This vulnerability affects an unknown code in the library msasn1.dll of the file lsass.exe of the component ASN.1. The manipulation as part of a BER Decoding leads to a integer coercion vulnerability. The CWE definition for the vulnerability is CWE-192. Integer coercion refers to a set of flaws pertaining to the type casting, extension, or truncation of primitive data types. As an impact it is known to affect confidentiality, integrity, and availability.

The bug was discovered 02/10/2004. The weakness was presented 02/10/2004 by Derek Soeder (DiGiT) with eEye as MS04-007 as confirmed bulletin (Technet). The advisory is shared for download at microsoft.com. This vulnerability was named CVE-2003-0818. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Technical details and also a public exploit are known. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 07/21/2025).

After immediately, there has been an exploit disclosed. It is possible to download the exploit at securiteam.com. It is declared as highly functional. As 0-day the estimated underground price was around $25k-$100k. The vulnerability scanner Nessus provides a plugin with the ID 12055 (MS04-007: ASN.1 Vulnerability Could Allow Code Execution (828028) (uncredentialed check) (HTTP)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Windows and running in the context r. The commercial vulnerability scanner Qualys is able to test this issue with plugin 90103 (Microsoft Windows ASN.1 Library Integer Handling Vulnerability (MS04-007)).

Applying the patch MS04-007 is able to eliminate this problem. The bugfix is ready for download at windowsupdate.microsoft.com. A possible mitigation has been published immediately after the disclosure of the vulnerability. Attack attempts may be identified with Snort ID 2386. In this case the pattern Authorization|3A| Negotiate YIQAAABiBoMAAAYrBgEFBQKgggBTMIFQoA4wDAYKKwYBBAGCNwICCqM is used for detection. Furthermore it is possible to detect and prevent this kind of attack with TippingPoint and the filter 2651.

The vulnerability is also documented in the databases at X-Force (15256), Exploit-DB (153), Tenable (12055), SecurityFocus (BID 9633†) and OSVDB (3902†). Additional details are provided at eeye.com. See VDB-509 for similar entry. Once again VulDB remains the best source for vulnerability data.

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CVSSv4info

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CVSSv3info

VulDB Meta Base Score: 7.3
VulDB Meta Temp Score: 7.0

VulDB Base Score: 7.3
VulDB Temp Score: 7.0
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CVSSv2info

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Exploitinginfo

Class: Integer coercion
CWE: CWE-192 / CWE-189
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ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Access: Public
Status: Highly functional
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Nessus ID: 12055
Nessus Name: MS04-007: ASN.1 Vulnerability Could Allow Code Execution (828028) (uncredentialed check) (HTTP)
Nessus File: 🔍
Nessus Risk: 🔍
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MetaSploit ID: ms04_007_killbill.rb
MetaSploit Name: MS04-007 Microsoft ASN.1 Library Bitstring Heap Overflow
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Threat Intelligenceinfo

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Countermeasuresinfo

Recommended: Patch
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Patch: MS04-007

Snort ID: 2386
Snort Message: WEB-IIS NTLM ASN1 vulnerability scan attempt
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Suricata ID: 2102384
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Timelineinfo

02/10/2004 🔍
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02/10/2004 +0 days 🔍
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02/10/2004 +0 days 🔍
02/11/2004 +0 days 🔍
02/12/2004 +1 days 🔍
02/15/2004 +3 days 🔍
03/03/2004 +17 days 🔍
07/21/2025 +7810 days 🔍

Sourcesinfo

Vendor: microsoft.com
Product: microsoft.com

Advisory: MS04-007
Researcher: Derek Soeder (DiGiT)
Organization: eEye
Status: Confirmed

CVE: CVE-2003-0818 (🔍)
GCVE (CVE): GCVE-0-2003-0818
GCVE (VulDB): GCVE-100-508

OVAL: 🔍

CERT: 🔍
X-Force: 15256
SecurityFocus: 9633 - Microsoft ASN.1 Library Length Integer Mishandling Memory Corruption Vulnerability
Secunia: 10759 - Microsoft Windows ASN.1 Library Integer Overflow Vulnerabilities, Highly Critical
OSVDB: 3902 - Microsoft Windows ASN.1 Library Integer Overflow
SecuriTeam: securiteam.com
Vulnerability Center: 3694 - [MS04-007] Microsoft ASN.1 library Allows Remote Code Execution, Critical

scip Labs: https://www.scip.ch/en/?labs.20161013
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Entryinfo

Created: 02/12/2004 10:06
Updated: 07/21/2025 04:23
Changes: 02/12/2004 10:06 (116), 06/27/2019 17:21 (5), 03/09/2021 11:24 (2), 12/31/2024 08:12 (16), 07/21/2025 04:23 (2)
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Cache ID: 216:CF4:103

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