| Package | Affected versions | Patched versions |
|---|---|---|
| pyopenssl | < 0.13.1 | 0.13.1 |
| pyopenssl | = 0.10= 0.11= 0.12= 0.7= 0.8= 0.9≤ 0.13 |
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.
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