CVE-2013-4314
MEDIUM severity · CVSS 4.3 · Improper input validation
4.3CVSS MEDIUM
Summary
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.
Impact & exploitability
Attack vectorNetwork
Attack complexity—
Privileges required—
User interaction—
Confidentiality impactNone
Integrity impact—
Availability impactNone
Exploit probability (EPSS)1%
AV:N/AC:M/Au:N/C:N/I:P/A:N
Affected products we track (1)
Recommendation
Apply the vendor fix in your normal patch cycle. Open any affected product above for its exact safe version.
Additional information
- NVD record
- http://www.ubuntu.com/usn/USN-1965-1Advisory
- http://lists.opensuse.org/opensuse-updates/2013-11/msg00015.html
- http://www.debian.org/security/2013/dsa-2763
- http://www.openwall.com/lists/oss-security/2013/09/06/2
- https://bugzilla.redhat.com/show_bug.cgi?id=1005325
- https://mail.python.org/pipermail/pyopenssl-users/2013-September/000478.html