Debian: 'fsh' symlink attack

    Date29 Nov 2000
    CategoryDebian
    2746
    Posted ByLinuxSecurity Advisories
    New fsh packages exist to fix potential symlink attack vulnerabilities.
    
    -----BEGIN PGP SIGNED MESSAGE-----
    
    - ------------------------------------------------------------------------
    Debian Security Advisory DSA-002-1                   This email address is being protected from spambots. You need JavaScript enabled to view it. 
    http://www.debian.org/security/                         Wichert Akkerman
    November 30, 2000
    - ------------------------------------------------------------------------
    
    
    Package        : fsh
    Problem type   : symlink attack
    Debian-specific: no
    
    Colin Phipps found an interesting symlink attack problem in fsh (a
    tool to quickly run remote commands over rsh/ssh/lsh). When fshd
    starts it creates a directory in /tmp to hold its sockets. It tries
    to do that securely by checking of it can chown that directory if
    it already exists to check if it is owner by the user invoking it.
    However an attacker can circumvent this check by inserting a
    symlink to a file that is owner by the user who runs fhsd and
    replacing that with a directory just before fshd creates the
    socket.
    
    This has been fixed in version 1.0.post.1-3potato.
    
    wget url
            will fetch the file for you
    dpkg -i file.deb
            will install the referenced file.
    
    
    Debian GNU/Linux 2.2 alias potato
    - ---------------------------------
    
      Potato was released for alpha, arm, i386, m68k, powerpc and sparc.
    
    
      Source archives:
         http://security.debian.org/dists/stable/updates/main/source/fsh_1.0.post.1-3potato.diff.gz
          MD5 checksum: 278a82a3899974ec60b4f92d3a2d53d7
         http://security.debian.org/dists/stable/updates/main/source/fsh_1.0.post.1-3potato.dsc
          MD5 checksum: d2e6eee08ba39ed82b756f39da2a1587
         http://security.debian.org/dists/stable/updates/main/source/fsh_1.0.post.1.orig.tar.gz
          MD5 checksum: d0ade4d65da92256c110a042479109f1
    
      Alpha architecture:
         http://security.debian.org/dists/stable/updates/main/binary-alpha/fsh_1.0.post.1-3potato_alpha.deb
          MD5 checksum: 729414dcde81ef4d50681839a8df62a2
    
      ARM architecture:
         http://security.debian.org/dists/stable/updates/main/binary-arm/fsh_1.0.post.1-3potato_arm.deb
          MD5 checksum: 5543a9a61b7af9b48c277f4aca83c75a
    
      Intel ia32 architecture:
         http://security.debian.org/dists/stable/updates/main/binary-i386/fsh_1.0.post.1-3potato_i386.deb
          MD5 checksum: 6d6dd446e87bff6ed57c7176813609c8
    
      Motorola 680x0 architecture:
         http://security.debian.org/dists/stable/updates/main/binary-m68k/fsh_1.0.post.1-3potato_m68k.deb
          MD5 checksum: 50bce3a431b141e68a3dfdae1b71f5a9
    
      PowerPC architecture:
         http://security.debian.org/dists/stable/updates/main/binary-powerpc/fsh_1.0.post.1-3potato_powerpc.deb
          MD5 checksum: 8e99a4a3657fee8d9545099d02526c5b
    
      Sun Sparc architecture:
         http://security.debian.org/dists/stable/updates/main/binary-sparc/fsh_1.0.post.1-3potato_sparc.deb
          MD5 checksum: fe3de98286cb7d5e83ca00631785adbe
    
      These files will be moved into
       ftp://ftp.debian.org/debian/dists/stable/*/binary-$arch/ soon.
    
    For not yet released architectures please refer to the appropriate
    directory  ftp://ftp.debian.org/debian/dists/sid/binary-$arch/ .
    
    - -- 
    - ----------------------------------------------------------------------------
    apt-get: deb  http://security.debian.org/ stable/updates main
    dpkg-ftp:  ftp://security.debian.org/debian-security dists/stable/updates/main
    Mailing list: This email address is being protected from spambots. You need JavaScript enabled to view it.
    
    -----BEGIN PGP SIGNATURE-----
    Version: 2.6.3ia
    Charset: noconv
    
    iQB1AwUBOiWVL6jZR/ntlUftAQHOswL+K5a0D9jC0wiUZNqpW0ypiQuf4MzkHtgJ
    8SO+Bm9hyF5BJgyLnsA8ZKchkF1nAlTMZP0iighUcD0+7C4aVtrtFjtXAc48tK1O
    bbdyGgROIDB0ONzIm+dYckBQwbNsd1pa
    =aRkV
    -----END PGP SIGNATURE-----
    
    
    
    
    
    You are not authorised to post comments.

    Comments powered by CComment

    LinuxSecurity Poll

    What do you think of the articles on LinuxSecurity?

    No answer selected. Please try again.
    Please select either existing option or enter your own, however not both.
    Please select minimum 0 answer(s) and maximum 3 answer(s).
    /main-polls/24-what-do-you-think-of-the-quality-of-the-articles-on-linuxsecurity?task=poll.vote&format=json
    24
    radio
    [{"id":"87","title":"Excellent, don't change a thing!","votes":"64","type":"x","order":"1","pct":57.14,"resources":[]},{"id":"88","title":"Should be more technical","votes":"15","type":"x","order":"2","pct":13.39,"resources":[]},{"id":"89","title":"Should include more HOWTOs","votes":"33","type":"x","order":"3","pct":29.46,"resources":[]}]["#ff5b00","#4ac0f2","#b80028","#eef66c","#60bb22","#b96a9a","#62c2cc"]["rgba(255,91,0,0.7)","rgba(74,192,242,0.7)","rgba(184,0,40,0.7)","rgba(238,246,108,0.7)","rgba(96,187,34,0.7)","rgba(185,106,154,0.7)","rgba(98,194,204,0.7)"]350
    bottom200

    We use cookies to provide and improve our services. By using our site, you consent to our Cookie Policy.