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CVE-2009-4565

7.5 · HIGH

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…

Published Jan 4, 2010sendmailCWE-310EPSS 2.40%

Overview

CVE-2009-4565 is a high-severity vulnerability affecting sendmail sendmail. It was published on January 4, 2010 and has a CVSS 2.0 base score of 7.5 (HIGH).

This vulnerability has a CVSS 2.0 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories and patches from sendmail. Update sendmail to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

Affected products

VendorProductVersionsStatus
sendmailsendmail0Affected

References

Reflists.opensuse.org/opensuse-security-announce/2010-03/msg00004.htmlRefmarc.info/?l=bugtraq&m=126953289726317&w=2Refsecunia.com/advisories/37998Refsecunia.com/advisories/38314Refsecunia.com/advisories/38915Refsecunia.com/advisories/39088Refsecunia.com/advisories/40109Refsecunia.com/advisories/43366Refsecurity.gentoo.org/glsa/glsa-201206-30.xmlRefsunsolve.sun.com/search/document.do?assetkey=1-77-1021797.1-1

How CyberStrike helps

Frequently asked questions

What is CVE-2009-4565?

CVE-2009-4565 is a high-severity vulnerability affecting sendmail sendmail. It was published on January 4, 2010 and has a CVSS 2.0 base score of 7.5 (HIGH).

How severe is CVE-2009-4565?

This vulnerability has a CVSS 2.0 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2009-4565?

Check the references section for vendor advisories and patches from sendmail. Update sendmail to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2009-4565?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2009-4565 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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