ld.so fails to unset LD_PRELOAD before executing suid root programs, allowing loading of insecure or malicious libraries.
ld.so, the UNIX/LINUX dynamic loader, fails in some conditions (and some operating system releases) to unset LD_PRELOAD before loading suid root programs for execution. Even though setuid root programs ignore LD_PRELOAD, programs called from suid root programs would use LD_PRELOAD and be loaded with insecure or malicious libraries and executed as root.
By altering LD_PRELOAD, attackers could cause malicious libraries to be loaded by programs called from setuid root programs, which then could execute arbitrary code as root.
Apply vendor patches; see the Systems Affected section below.
Compaq Computer Corporation
The original public announcement was by Solar Designer <email@example.com>.
This document was last modified by Tim Shimeall
|Date First Published:||2001-05-17|
|Date Last Updated:||2001-06-21 19:29 UTC|