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Gentoo Linux Security Advisory GLSA 200408-16 |
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http://security.gentoo.org/ |
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|
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Severity: Low |
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Title: glibc: Information leak with LD_DEBUG |
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Date: August 16, 2004 |
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Bugs: #59526 |
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ID: 200408-16 |
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|
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Synopsis |
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======== |
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|
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glibc contains an information leak vulnerability allowing the debugging |
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of SUID binaries. |
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|
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Background |
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========== |
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|
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The GNU C library defines various Unix-like "system calls" and other |
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basic facilities needed for a standard POSIX-like application to |
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operate. |
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|
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Affected packages |
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================= |
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|
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------------------------------------------------------------------- |
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Package / Vulnerable / Unaffected |
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------------------------------------------------------------------- |
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1 sys-libs/glibc <= 2.3.2-r10 >= 2.3.2-r11 |
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2 sys-libs/glibc <= 2.3.3.20040420 >= 2.3.3.20040420-r1 |
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3 sys-libs/glibc <= 2.3.3.20040420 >= 2.3.4.20040619-r1 |
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4 sys-libs/glibc <= 2.3.4.20040619 >= 2.3.4.20040619-r1 |
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5 sys-libs/glibc <= 2.3.2-r10 Vulnerable! |
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6 sys-libs/glibc <= 2.3.4.20040605 Vulnerable! |
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------------------------------------------------------------------- |
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# Package 1 only applies to ALPHA, ARM, HPPA, IA64 and SPARC |
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users. |
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# Package 2 only applies to x86 and PPC users. |
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# Package 3 only applies to MIPS users. |
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# Package 4 only applies to AMD64 users. |
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# Package 5 only applies to S390 users. |
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# Package 6 only applies to PPC64 users. |
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------------------------------------------------------------------- |
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NOTE: Certain packages are still vulnerable. Users should migrate |
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to another package if one is available or wait for the |
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existing packages to be marked stable by their |
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architecture maintainers. |
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------------------------------------------------------------------- |
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6 affected packages; please see the notes above... |
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------------------------------------------------------------------- |
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|
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Description |
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=========== |
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|
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Silvio Cesare discovered a potential information leak in glibc. It |
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allows LD_DEBUG on SUID binaries where it should not be allowed. This |
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has various security implications, which may be used to gain |
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confidentional information. |
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|
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Impact |
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====== |
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|
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An attacker can gain the list of symbols a SUID application uses and |
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their locations and can then use a trojaned library taking precendence |
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over those symbols to gain information or perform further exploitation. |
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|
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Workaround |
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========== |
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There is no known workaround at this time. All users are encouraged to |
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upgrade to the latest available version of glibc. |
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|
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Resolution |
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========== |
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|
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All glibc users should upgrade to the latest version: |
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|
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# emerge sync |
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# emerge -pv your_version |
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# emerge your_version |
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|
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Availability |
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============ |
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|
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This GLSA and any updates to it are available for viewing at |
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the Gentoo Security Website: |
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|
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http://security.gentoo.org/glsa/glsa-200408-16.xml |
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|
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Concerns? |
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========= |
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|
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Security is a primary focus of Gentoo Linux and ensuring the |
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confidentiality and security of our users machines is of utmost |
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importance to us. Any security concerns should be addressed to |
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security@g.o or alternatively, you may file a bug at |
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http://bugs.gentoo.org. |
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|
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License |
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======= |
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Copyright 2004 Gentoo Foundation, Inc; referenced text |
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belongs to its owner(s). |
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|
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The contents of this document are licensed under the |
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Creative Commons - Attribution / Share Alike license. |
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|
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http://creativecommons.org/licenses/by-sa/1.0 |