TUCoPS :: SCO :: lpforms.htm

SCO OpenServer 5.0.6 lpforms buffer overflow



    SCO OpenServer 5.0.6 upgrade from 5.0.x and 5.0.6 fresh install


    Following  is  based  on  a  Strategic Reconnisiance Team Security
    Advisory (SRT2001-06).  SCO  OpenServer 5.0.6 ships with  suid bin
    /opt/K/SCO/Unix/5.0.6Ga/usr/lib/lpforms.     lpforms   has    poor
    handling of command line arguments resulting in a buffer overflow.
    lpforms will core dump if fed more than 6240 chars.

        /opt/K/SCO/Unix/5.0.6Ga/usr/lib/lpforms `perl -e 'print "A" x 7000'`
        Memory fault - core dumped

    This problem makes  it possible to  overwrite memory space  of the
    running process, and potentially  execute code with the  inherited
    privileges of bin.

    Credit goes to Kevin Finisterre.


    chmod  -s  /opt/K/SCO/Unix/5.0.6Ga/usr/lib/lpforms  as workaround.
    Vendor was notified on 03/22/01.   Vendor lab tests confirmed  the
    issue.  Patch status is unknown.

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