Fluid Attacks Database

Description

PyOpenSSL Mishandles NUL Byte In Certificate Subject Alternative Name 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.

Mitigation

Update Impact

Minimal update. May introduce new vulnerabilities or breaking changes.

Ecosystem	Package	Affected version	Patched versions
pypi	pyopenssl	>=0 <0.13.1	0.13.1
debian 14	pyopenssl	>=0 <0.13-2.1	0.13-2.1
debian 11	pyopenssl	>=0 <0.13-2.1	0.13-2.1
debian 12	pyopenssl	>=0 <0.13-2.1	0.13-2.1
debian 13	pyopenssl	>=0 <0.13-2.1	0.13-2.1

Aliases

1. CVE-2013-43142. NVD-2013-43143. OSV-2013-43144. OSV-DEBIAN-2013-43145. GCVE-2013-43146. SECURITY-TRACKER-CVE-2013-4314

References

1. https://github.com/pyca/pyopenssl/commit/6bbf44a00b35fb28df1f66aa194b2fe95eab1ab22. https://bugzilla.redhat.com/show_bug.cgi?id=10053253. https://github.com/pypa/advisory-database/tree/main/vulns/pyopenssl/PYSEC-2013-31.yaml4. https://mail.python.org/pipermail/pyopenssl-users/2013-September/000478.html5. http://lists.opensuse.org/opensuse-updates/2013-11/msg00015.html6. http://www.debian.org/security/2013/dsa-27637. http://www.openwall.com/lists/oss-security/2013/09/06/28. http://www.ubuntu.com/usn/USN-1965-1

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