What’s Vulnerable › Vulnerabilities

CVE-2009-3767

• Severity: medium (CVSS 4.3 v2.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 3.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2009-10-23 · updated 2026-06-16
• Weakness: CWE-295

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.

Affected products

• macOS: before 10.6.2 — fixed in 10.6.2
• Fedoraproject Fedora: 11
• openldap: before 2.4.18 — fixed in 2.4.18

How to fix

Upgrade to a fixed version: macOS 10.6.2; openldap 2.4.18. Check the vendor advisory for mitigations.

References

• http://lists.apple.com/archives/security-announce/2009/Nov/msg00000.html
• http://lists.fedoraproject.org/pipermail/package-announce/2010-March/036138.html
• http://lists.opensuse.org/opensuse-security-announce/2009-10/msg00001.html
• http://marc.info/?l=oss-security&m=125198917018936&w=2
• http://marc.info/?l=oss-security&m=125369675820512&w=2
• http://secunia.com/advisories/38769
• http://secunia.com/advisories/40677
• http://security.gentoo.org/glsa/glsa-201406-36.xml
• http://support.apple.com/kb/HT3937
• http://www.openldap.org/devel/cvsweb.cgi/libraries/libldap/tls_o.c.diff?r1=1.8&r2=1.11&f=h
• http://www.redhat.com/support/errata/RHSA-2010-0543.html
• http://www.redhat.com/support/errata/RHSA-2011-0896.html

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