The remote host is missing an update to the system as announced in the referenced advisory.

Update your system with the appropriate patches or software upgrades. http://www.courtesan.com/sudo/alerts/bash_env.html http://www.vuxml.org/freebsd/1b725079-9ef6-11da-b410-000e0c2e438a.html

The following package is affected: sudo CVE-2005-2959 Incomplete blacklist vulnerability in sudo 1.6.8 and earlier allows local users to gain privileges via the (1) SHELLOPTS and (2) PS4 environment variables before executing a bash script on behalf of another user, which are not cleared even though other variables are.