Debian: DSA-2141-1: New openssl packages fix protocol design flaw

    Date 05 Jan 2011
    88
    Posted By LinuxSecurity 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
    
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    Debian Security Advisory DSA-2141-1                  This email address is being protected from spambots. You need JavaScript enabled to view it.
    https://www.debian.org/security/                           Stefan Fritsch
    January 06, 2011                      https://www.debian.org/security/faq
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    Package        : openssl
    Vulnerability  : SSL/TLS insecure renegotiation protocol design flaw
    Problem type   : remote
    Debian-specific: no
    CVE ID         : CVE-2009-3555 CVE-2010-4180
    Debian Bug     : 555829
    
    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.
    
    If openssl is used in a server application, it will by default no
    longer accept renegotiation from clients that do not support the
    RFC5746 secure renegotiation extension. A separate advisory will add
    RFC5746 support for nss, the security library used by the iceweasel
    web browser. For apache2, there will be an update which allows to
    re-enable insecure renegotiation.
    
    This version of openssl is not compatible with older versions of tor.
    You have to use at least tor version 0.2.1.26-1~lenny+1, which has
    been included in the point release 5.0.7 of Debian stable.
    
    Currently we are not aware of other software with similar compatibility
    problems.
    
    
    CVE-2010-4180:
     
    In addition, this update fixes a flaw that allowed a client to bypass
    restrictions configured in the server for the used cipher suite.
    
    
    For the stable distribution (lenny), this problem has been fixed
    in version 0.9.8g-15+lenny11.
    
    For the unstable distribution (sid), and the testing distribution
    (squeeze), this problem has been fixed in version 0.9.8o-4.
    
    We recommend that you upgrade your openssl package.
    
    Further information about Debian Security Advisories, how to apply
    these updates to your system and frequently asked questions can be
    found at: https://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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