new version isdnutils fixes exploitable xmonisdn

    Date13 Dec 1999
    CategoryDebian
    3051
    Posted ByLinuxSecurity Advisories
    We have received reports that the version of xmonisdn as distributed in the isndutils package from Debian GNU/Linux 2.1 has a security problem.
    -----BEGIN PGP SIGNED MESSAGE-----
    
    We have received reports that the version of xmonisdn as distributed
    in the isndutils package from Debian GNU/Linux 2.1 has a security
    problem.
    
    Xmonisdn is an X applet that shows the status of the ISDN links. You can
    configure it to run two scripts when the left or right mouse button are
    clicked on it. Xmonisdn was installed setuid root so that the scripts
    could do things like add and delete the default route. However is that
    while the scripts were checked for owner root and not writeable by group
    or others the scripts are run via the system() library function, which
    spawns a shell to run it. This means that the scripts are open to attack
    via IFS and/or PATH manipulation.
    
    However, the setuid root isn't necessary anymore as the ISDN system now
    offers other ways of preventing dialouts besides by manipulating network
    routes.  This can be done by anyone who can access /dev/isdnctrl0 and
    /dev/isdninfo. On debian systems those are rw for group dialout, so if
    xmonisdn is run by someone in group dialout, they can execute the
    necessary isdnctrl commands.
    
    wget url
            will fetch the file for you
    dpkg -i file.deb
            will install the referenced file.
    
    Debian GNU/Linux 2.1 alias slink
    - -------------------------------
    
      This version of Debian was released only for Intel, the Motorola
      680x0, the alpha and the Sun sparc architecture.
    
      Source archives:
        http://security.debian.org/dists/stable/updates/source/isdnut
    ils_3.0-12slink13.diff.gz
          MD5 checksum: 56f4328687b0478c83b49ae8c61d3a24
        http://security.debian.org/dists/stable/updates/source/isdnutils_
    3.0-12slink13.dsc
          MD5 checksum: 44ecac14b66830e969ce6e09b3f95e1e
        http://security.debian.org/dists/stable/updates/source/isdnutils_3.0.ori
    g.tar.gz
          MD5 checksum: 83cb39ed37747367331ec5b433fc7dda
    
      Alpha architecture:
        http://security.debian.org/dists/stable/updates/binary-
    alpha/isdnutils_3.0-12slink13_alpha.deb
          MD5 checksum: 984e4be2224fcf90261139e2576b2d35
    
      Intel ia32 architecture:
        http://security.debian.org/dists/stable/updates/binary-
    i386/isdnutils_3.0-12slink13_i386.deb
          MD5 checksum: 6550f5ee476a0c8056acf19f5a1e41fb
    
      Sun Sparc architecture:
        http://security.debian.org/dists/stable/updates/binary-
    sparc/isdnutils_3.0-12slink13_sparc.deb
          MD5 checksum: 2da71a182ff8955c0822aa9737095c97
    
    For not yet released architectures please refer to the appropriate
    directory ftp://ftp.debian.org/debian/dists/sid/binary-$arch/ .
    
    - --
    Debian GNU/Linux      .    Security Managers     .   This email address is being protected from spambots. You need JavaScript enabled to view it.
                  This email address is being protected from spambots. You need JavaScript enabled to view it.
      Christian Hudon     .     Wichert Akkerman     .     Martin Schulze
       .     .   
    
    
    
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