Debian: DSA-2763-1: pyopenssl security update

    Date24 Sep 2013
    CategoryDebian
    34
    Posted ByLinuxSecurity Advisories
    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.
    
    - -------------------------------------------------------------------------
    Debian Security Advisory DSA-2763-1                   This email address is being protected from spambots. You need JavaScript enabled to view it.
    http://www.debian.org/security/                      Salvatore Bonaccorso
    September 24, 2013                     http://www.debian.org/security/faq
    - -------------------------------------------------------------------------
    
    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: This email address is being protected from spambots. You need JavaScript enabled to view it.
    
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