Vulnerability

    lpusers

Affected

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

Description

    Following is  based on  a Strategic  Reconnaissance Team  Security
    Advisory (SRT2001-05).  SCO  OpenServer 5.0.6 ships with  suid bin
    /opt/K/SCO/Unix/5.0.6Ga/usr/lib/lpusers.     lpusers   has    poor
    handling of command line arguments resulting in a buffer overflow.
    lpusers will core dump if fed more than 670 chars.

        /opt/K/SCO/Unix/5.0.6Ga/usr/lib/lpusers -u `perl -e 'print "A" x 700'`
        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.

Solution

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