The wrapper program in mailman 2.0beta3 and 2.0beta4 does not properly cleanse untrusted format strings, which allows local users to gain privileges.
http://www.securityfocus.com/bid/1539
http://www.securityfocus.com/archive/1/73220
http://www.redhat.com/support/errata/RHSA-2000-030.html
http://archives.neohapsis.com/archives/bugtraq/2000-07/0479.html
http://archives.neohapsis.com/archives/bugtraq/2000-07/0474.html