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suid binaries evaluate LD_PRELOAD?



Package: glibc
Version: different versions
Distribution: Debian woody, sid, other Non-Debian (SuSE,RH, Gentoo)
Unaffected: Debian potato (at least my installation)
Vulnerable: yes, local, privilege escalation

Reproducible: always

Behaviour: LD_PRELOAD gets evaluated:
caspar@marvin:~$ LD_PRELOAD=funny /bin/su
/bin/su: error while loading shared libraries: funny: cannot open shared
object file: No such file or directory
caspar@marvin:~$

Should be: no evaluation:
caspar@marvin:~$ LD_PRELOAD=funny /bin/su
Password:

Known problem: reported in 1998, also fix in DSA-039-1, Mar 8, 2001

Reported to me by: Sascha Silbe
Initial Bugreport by Sascha Silbe:
http://bugs.gentoo.org/show_bug.cgi?id=24332


Please fix this bug.


bye

caspar

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