[ GLSA 200707-04 ] GNU C Library: Integer overflow

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  Severity: Normal
     Title: GNU C Library: Integer overflow
      Date: July 03, 2007
      Bugs: #183844
        ID: 200707-04

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Synopsis

An integer overflow in the dynamic loader, ld.so, could result in the execution of arbitrary code with escalated privileges.

Background

The GNU C library is the standard C library used by Gentoo Linux systems. It provides programs with basic facilities and interfaces to system calls. ld.so is the dynamic linker which prepares dynamically linked programs for execution by resolving runtime dependencies and related functions.

Affected packages

     Package         /  Vulnerable  /                       Unaffected
    -------------------------------------------------------------------
  1  sys-libs/glibc      < 2.5-r4                            >= 2.5-r4
    -------------------------------------------------------------------
     # Package 1 only applies to x86 users.

Description

Tavis Ormandy of the Gentoo Linux Security Team discovered a flaw in the handling of the hardware capabilities mask by the dynamic loader. If a mask is specified with a high population count, an integer overflow could occur when allocating memory.

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Impact

As the hardware capabilities mask is honored by the dynamic loader during the execution of suid and sgid programs, in theory this vulnerability could result in the execution of arbitrary code with root privileges. This update is provided as a precaution against currently unknown attack vectors.

Workaround

There is no known workaround at this time.

Resolution

All users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=sys-libs/glibc-2.5-r4"

References

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  [ 1 ] CVE-2007-3508
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-3508

Availability

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

  http://security.gentoo.org/glsa/glsa-200707-04.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 2007 Gentoo Foundation, Inc; referenced text belongs to its owner(s).

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The contents of this document are licensed under the Creative Commons - Attribution / Share Alike license.

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