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Gentoo Linux Security Advisory GLSA 200408-16
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http://security.gentoo.org/
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Severity: Low
Title: glibc: Information leak with LD_DEBUG
Date: August 16, 2004
Bugs: #59526
ID: 200408-16
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Synopsis
========
glibc contains an information leak vulnerability allowing the debugging
of SUID binaries.
Background
==========
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 <= 2.3.3.20040420 >= 2.3.3.20040420-r1
3 sys-libs/glibc <= 2.3.3.20040420 >= 2.3.4.20040619-r1
4 sys-libs/glibc <= 2.3.4.20040619 >= 2.3.4.20040619-r1
5 sys-libs/glibc <= 2.3.2-r10 Vulnerable!
6 sys-libs/glibc <= 2.3.4.20040605 Vulnerable!
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# 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.
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6 affected packages; please see the notes above...
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Description
===========
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.
Impact
======
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.
Workaround
==========
There is no known workaround at this time. All users are encouraged to
upgrade to the latest available version of glibc.
Resolution
==========
All glibc users should upgrade to the latest version:
# emerge sync
# emerge -pv your_version
# emerge your_version
Availability
============
This GLSA and any updates to it are available for viewing at
the Gentoo Security Website:
http://security.gentoo.org/glsa/glsa-200408-16.xml
Concerns?
=========
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@xxxxxxxxxx or alternatively, you may file a bug at
http://bugs.gentoo.org.
License
=======
Copyright 2004 Gentoo Foundation, Inc; referenced text
belongs to its owner(s).
The contents of this document are licensed under the
Creative Commons - Attribution / Share Alike license.
http://creativecommons.org/licenses/by-sa/1.0
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