Debian DSA-2763-1 Critical: PyOpenSSL Hostname Bypass Remote Threat
debian
September 24, 2013
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
Topics Covered
Summary
A remote attacker in the position to obtain a certificate for
'www.foo.org\0.' 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/
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Severity
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Critical
Package: pyopenssl
CVE ID: CVE-2013-4314
Topics Covered
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