SCO OpenServer 5.0.6 (and possibly earlier versions) ships with a suid 'bin' executable called 'recon'.
'recon' is used to buffer and forward escape sequences from a user's input to timing-sensitive applications.
'recon' contains a locally exploitable buffer overflow condition present in the handling of command-line parameters.
If properly exploited, this can yield user 'bin' privileges to the attacker.
/opt/K/SCO/Unix/5.0.6Ga/usr/bin/recon `perl -e 'print "A" x 3000'`
Memory fault - core dumped
SCO OpenServer recon First Argument Local Overflow
Local Access Required
Loss of Integrity
A local overflow exists in OpenServer. The recon command fails to validate user-supplied arguments resulting in a buffer overflow. With a specially crafted request consisting of more than 1315 characters, an attacker can cause arbitrary code execution resulting in a loss of integrity.
Currently, there are no known workarounds or upgrades to correct this issue. However, SCO has released a patch to address this vulnerability.