Debian: DSA-2141-2: New nss packages fix protocol design flaw

    Date05 Jan 2011
    CategoryDebian
    58
    Posted ByLinuxSecurity Advisories
    CVE-2009-3555: Marsh Ray, Steve Dispensa, and Martin Rex discovered a flaw in the TLS and SSLv3 protocols. If an attacker could perform a man in the middle
    
    - ------------------------------------------------------------------------
    Debian Security Advisory DSA-2141-2                  This email address is being protected from spambots. You need JavaScript enabled to view it.
    http://www.debian.org/security/                           Stefan Fritsch
    January 06, 2011                      http://www.debian.org/security/faq
    - ------------------------------------------------------------------------
    
    Package        : nss
    Vulnerability  : SSL/TLS insecure renegotiation protocol design flaw
    Problem type   : remote
    Debian-specific: no
    CVE ID         : CVE-2009-3555
    
    CVE-2009-3555:
    
    Marsh Ray, Steve Dispensa, and Martin Rex discovered a flaw in the TLS
    and SSLv3 protocols. If an attacker could perform a man in the middle
    attack at the start of a TLS connection, the attacker could inject
    arbitrary content at the beginning of the user's session. This update
    adds backported support for the new RFC5746 renegotiation extension
    which fixes this issue.
    
    The updated libraries allow to use shell environment variables to
    configure if insecure renegotiation is still allowed. The syntax of
    these environment variables is described in the release notes to
    version 3.12.6 of nss:
     
    https://developer.mozilla.org/NSS_3.12.6_release_notes
    
    However, the default behaviour for nss in Debian 5.0 (Lenny) is 
    NSS_SSL_ENABLE_RENEGOTIATION=3, which allows clients to continue to
    renegotiate with vulnerable servers.
    
    For the stable distribution (lenny), this problem has been fixed
    in version 3.12.3.1-0lenny3.
    
    For the unstable distribution (sid), and the testing distribution
    (squeeze), this problem has been fixed in version 3.12.6-1.
    
    We recommend that you upgrade your nss package.
    
    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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