[ GLSA 200408-16 ] glibc: Information leak with LD_DEBUG

Type securityvulns
Reporter Securityvulns
Modified 2004-08-19T00:00:00


Gentoo Linux Security Advisory GLSA 200408-16


Severity: Low Title: glibc: Information leak with LD_DEBUG Date: August 16, 2004 Bugs: #59526 ID: 200408-16


glibc contains an information leak vulnerability allowing the debugging of SUID binaries.


The GNU C library defines various Unix-like "system calls" and other basic facilities needed for a standard POSIX-like application to operate.

Affected packages

 Package         /      Vulnerable      /               Unaffected

1 sys-libs/glibc <= 2.3.2-r10 >= 2.3.2-r11 2 sys-libs/glibc <= >= 3 sys-libs/glibc <= >= 4 sys-libs/glibc <= >= 5 sys-libs/glibc <= 2.3.2-r10 Vulnerable! 6 sys-libs/glibc <= Vulnerable! ------------------------------------------------------------------- # Package 1 only applies to ALPHA, ARM, HPPA, IA64 and SPARC users. # Package 2 only applies to x86 and PPC users. # Package 3 only applies to MIPS users. # Package 4 only applies to AMD64 users. # Package 5 only applies to S390 users. # Package 6 only applies to PPC64 users. ------------------------------------------------------------------- NOTE: Certain packages are still vulnerable. Users should migrate to another package if one is available or wait for the existing packages to be marked stable by their architecture maintainers. ------------------------------------------------------------------- 6 affected packages; please see the notes above... -------------------------------------------------------------------


Silvio Cesare discovered a potential information leak in glibc. It allows LD_DEBUG on SUID binaries where it should not be allowed. This has various security implications, which may be used to gain confidentional information.


An attacker can gain the list of symbols a SUID application uses and their locations and can then use a trojaned library taking precendence over those symbols to gain information or perform further exploitation.


There is no known workaround at this time. All users are encouraged to upgrade to the latest available version of glibc.


All glibc users should upgrade to the latest version:

# emerge sync

# emerge -pv your_version
# emerge your_version


This GLSA and any updates to it are available for viewing at the Gentoo Security Website:



Security is a primary focus of Gentoo Linux and ensuring the confidentiality and security of our users machines is of utmost importance to us. Any security concerns should be addressed to security@gentoo.org or alternatively, you may file a bug at http://bugs.gentoo.org.


Copyright 2004 Gentoo Foundation, Inc; referenced text belongs to its owner(s).

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