CVE-2009-4565

Severity: high (CVSS 7.5 v2.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 2.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2010-01-04 · updated 2026-06-16
Weakness: CWE-310

Description

sendmail before 8.14.4 does not properly handle a '\0' character in a Common Name (CN) field of an X.509 certificate, which (1) allows man-in-the-middle attackers to spoof arbitrary SSL-based SMTP servers via a crafted server certificate issued by a legitimate Certification Authority, and (2) allows remote attackers to bypass intended access restrictions via a crafted client certificate issued by a legitimate Certification Authority, a related issue to CVE-2009-2408.

Affected products

Sendmail: through 8.14.3; 2.6, 2.6.1, 3.0, 3.0.1, 4.1, 4.55 (+55)

References

http://lists.opensuse.org/opensuse-security-announce/2010-03/msg00004.html
http://marc.info/?l=bugtraq&m=126953289726317&w=2
http://secunia.com/advisories/37998
http://secunia.com/advisories/38314
http://secunia.com/advisories/38915
http://secunia.com/advisories/39088
http://secunia.com/advisories/40109
http://secunia.com/advisories/43366
http://security.gentoo.org/glsa/glsa-201206-30.xml
http://sunsolve.sun.com/search/document.do?assetkey=1-77-1021797.1-1
http://www.debian.org/security/2010/dsa-1985
http://www.redhat.com/support/errata/RHSA-2011-0262.html

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