1. Forum
  2. Usenet
  3. LINUX.DEBIAN.ANNOUNCE.SEC

  • [SECURITY] [DSA-2141-2] New nss packages fix protocol design flaw

    From Stefan Fritsch@1:229/2 to All on Thu Jan 6 00:30:01 2011
    From: [email protected]

    -----BEGIN PGP SIGNED MESSAGE-----
    Hash: SHA1

    - ------------------------------------------------------------------------ Debian Security Advisory DSA-2141-2 [email protected] 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: [email protected]
    -----BEGIN PGP SIGNATURE-----
    Version: GnuPG v1.4.10 (GNU/Linux)

    iD8DBQFNJPfIbxelr8HyTqQRAhfvAJ9cQ5xPCr1MKm2M2HkOX4O/5Lau6wCeNAtE 3BuBYa58RjJmNXQNm8nqnhs=
    =8rXx
    -----END PGP SIGNATURE-----


    --
    To UNSUBSCRIBE, email to [email protected]
    with a subject of "unsubscribe". Trouble? Contact [email protected] Archive: http://lists.debian.org/[email protected]

    --- SoupGate-Win32 v1.05
    * Origin: you cannot sedate... all the things you hate (1:229/2)