CVE-2009-3765 Security feature bypass in n/a

Medium 6.8 Published 23 Oct 2009 Updated 16 Sep 2024

Man-in-the-middle attackers can spoof SSL servers by exploiting improper null character handling in certificate Common Names, bypassing security checks.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: A user has to click or open something
Fix: None listed

What is CVE-2009-3765?

CVE-2009-3765 is a medium-severity vulnerability in n/a, published on 23 Oct 2009. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

Official description

mutt_ssl.c in mutt 1.5.19 and 1.5.20, 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.

Weakness: CWE-310

Which versions are affected by CVE-2009-3765?

It affects 1 product.

Products include Mutt Mutt.

How do I fix CVE-2009-3765?

No fix has been published for CVE-2009-3765 yet. Limit exposure of the affected software until one is available.

Is CVE-2009-3765 being exploited?

There is no known exploitation of CVE-2009-3765 in the wild and no public exploit code.

Sources

Also known as GHSA-fp73-6h6h-9v4h.