The LD_PRELOAD is being followed due to the "ALL" command list.  For sudoers 
lines that do not have this, it is disallowed:
sudo: sorry, you are not allowed to set the following environment variables: 
LD_PRELOAD

This is only an exploit for configurations using "setenv", which is very
dangerous (for this reason).

** Summary changed:

- Privilege Escalation Exploit with setenv (v. <= 1.6.9p18 )
+ Privilege Escalation Exploit with setenv or ALL (v. <= 1.6.9p18 )

** Changed in: sudo (Ubuntu)
       Status: New => Invalid

-- 
Privilege Escalation Exploit with setenv or ALL (v. <= 1.6.9p18 )
https://bugs.launchpad.net/bugs/349075
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