When using the LD_PRELOAD environmental variable in SUID or SGID applications, glibc does not verify that preloaded libraries in /etc/ld.so.cache are also SUID/SGID, which could allow a local user to overwrite arbitrary files by loading a library from /lib or /usr/lib.
https://exchange.xforce.ibmcloud.com/vulnerabilities/5971
http://www.securityfocus.com/bid/2223
http://www.securityfocus.com/archive/1/157650
http://www.redhat.com/support/errata/RHSA-2001-002.html
http://www.novell.com/linux/security/advisories/2001_001_glibc_txt.html
http://www.linux-mandrake.com/en/security/2001/MDKSA-2001-012.php3?dis=7.2
http://www.debian.org/security/2001/dsa-039
http://www.calderasystems.com/support/security/advisories/CSSA-2001-007.0.txt
http://archives.neohapsis.com/archives/linux/turbolinux/2001-q1/0004.html