CVE-2013-4314 PyOpenSSL Mishandles NUL Byte In Certificate Subject Alternative Name

What is CVE-2013-4314?

CVE-2013-4314 is a medium-severity vulnerability in Canonical Ubuntu Linux, published on 30 Sep 2013. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

The X509Extension in pyOpenSSL before 0.13.1 does not properly handle a '\0' character in a domain name in the Subject Alternative Name 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.

Weakness: CWE-20

Which versions are affected by CVE-2013-4314?

3 open source packages ship an affected version, including pyopenssl and pyOpenSSL. It affects 2 products.

Products include Canonical Ubuntu Linux, Jean-Paul Calderone Pyopenssl.

How do I fix CVE-2013-4314?

Upgrade pyopenssl to 0.13.1 or later.

Is CVE-2013-4314 being exploited?

There is no known exploitation of CVE-2013-4314 in the wild and no public exploit code.

Other vulnerabilities in Canonical Ubuntu Linux

• CVE-2020-11651 SaltStack Salt Authentication Bypass Exploited Critical 9.8
• CVE-2020-7247 OpenSMTPD Remote Code Execution Exploited Critical 9.8
• CVE-2019-16928 Exim Out-of-bounds Write Exploited Critical 9.8
• CVE-2018-6789 Exim Buffer Overflow Exploited Critical 9.8
• CVE-2015-2590 Oracle Java SE and Java SE Embedded Remote Code Execution Exploited Critical 9.8

All Canonical Ubuntu Linux vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as DEBIAN-CVE-2013-4314, DSA-2763-1, GHSA-6748-36qp-fx6r, MGASA-2013-0277, PYSEC-2013-31, openSUSE-SU-2024:10214-1 and 3 more.