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.
The MITRE CVE dictionary describes this issue as:
Find out more about CVE-2013-4314 from the MITRE CVE dictionary dictionary and NIST NVD.
Not vulnerable. This issue did not affect the versions of pyOpenSSL as shipped with Red Hat Enterprise Linux 5 and 6.
NOTE: The following CVSS v2 metrics and score provided are preliminary and subject to review.
| Base Score | 4.3 |
|---|---|
| Base Metrics | AV:N/AC:M/Au:N/C:N/I:P/A:N |
| Access Vector | Network |
| Access Complexity | Medium |
| Authentication | None |
| Confidentiality Impact | None |
| Integrity Impact | Partial |
| Availability Impact | None |
Find out more about Red Hat support for the Common Vulnerability Scoring System (CVSS).
| Platform | Package | State |
|---|---|---|
| Red Hat Gluster Storage 2.1 | pyOpenSSL | Not affected |
| Red Hat Enterprise Linux OpenStack Platform 4.0 | pyOpenSSL | Not affected |
| Red Hat Enterprise Linux 7 | pyOpenSSL | Not affected |
| Red Hat Enterprise Linux 6 | pyOpenSSL | Not affected |
| Red Hat Enterprise Linux 5 | pyOpenSSL | Not affected |
Vulmon