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Debian Security Advisory DSA-2763-1                   security@debian.org
http://www.debian.org/security/                      Salvatore Bonaccorso
September 24, 2013                     http://www.debian.org/security/faq
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Package        : pyopenssl
Vulnerability  : hostname check bypassing
Problem type   : remote
Debian-specific: no
CVE ID         : CVE-2013-4314
Debian Bug     : 722055

It was discovered that PyOpenSSL, a Python wrapper around the OpenSSL
library, does not properly handle certificates with NULL characters in
the Subject Alternative Name field.

A remote attacker in the position to obtain a certificate for
'www.foo.org\0.example.com' from a CA that a SSL client trusts, could
use this to spoof 'www.foo.org' and conduct man-in-the-middle attacks
between the PyOpenSSL-using client and the SSL server.

For the oldstable distribution (squeeze), this problem has been fixed in
version 0.10-1+squeeze1.

For the stable distribution (wheezy), this problem has been fixed in
version 0.13-2+deb7u1.

For the unstable distribution (sid), this problem has been fixed in
version 0.13-2.1.

We recommend that you upgrade your pyopenssl packages.

Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at: http://www.debian.org/security/

Mailing list: debian-security-announce@lists.debian.org
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