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

From: Kurt Lieber (klieber_at_gentoo.org)
Date: 08/17/04

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To: gentoo-announce@lists.gentoo.org

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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!
        -------------------------------------------------------------------
         # 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...
        -------------------------------------------------------------------

    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@gentoo.org 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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