Linux distributions and /bin/login overflow

From: Anton Rager (a_ragerat_private)
Date: Wed Dec 19 2001 - 15:04:59 PST

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    Hello,
    
    It seems that while Redhat Linux and Caldera Linux
    distributions are immune to the recent /bin/login
    environ overflow, other Linux distributions are not. 
    Several Linux distributions install /bin/login with
    SysV login options enabled.
    
    Slackware 8.0 and lower [tested with 8.0, 4.0, 3.3]
    has SysV options enabled with /bin/login and is
    vulnerable.
    
    SuSE 6.1 has SysV options enabled with /bin/login and
    is vulnerable.  I don't have a newer SuSE release, so
    others will need to verify. It would seem logical that
    SuSE 8.3 still includes the SysV login options
    enabled, and is probably vulnerable as well.
    
    Other distributions should be checked as well.  A
    quick way to check for SysV option capabilities is to
    type "login", then enter "root testenv1=test" at the
    login: prompt.  Supply your root passwd, and look for
    "testenv1" in the output of set.  If it's set, then
    your copy of /bin/login supports SysV options.....and
    is probably vulnerable. Follow similar procedure to
    find overflow possibility/specifics ;)
    
    
    Regards,
    
    Anton Rager
    a_ragerat_private
    
    
    
    
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