PCRE: Multiple vulnerabilities

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Gentoo Linux Security Advisory                          
GLSA 200711-30
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                                            http://security.gentoo.or
g/
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  Severity: Normal
     Title: PCRE: Multiple vulnerabilities
      Date: November 20, 2007
      Bugs: #198198
        ID: 200711-30

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Synopsis
========

PCRE is vulnerable to multiple buffer overflow and memory
corruption
vulnerabilities, possibly leading to the execution of
arbitrary code.

Background
==========

PCRE is a library providing functions for Perl-compatible
regular
expressions.

Affected packages
=================

   
------------------------------------------------------------
-------
     Package           /  Vulnerable  /                    
Unaffected
   
------------------------------------------------------------
-------
  1  dev-libs/libpcre      < 7.3-r1                      
   >= 7.3-r1

Description
===========

Tavis Ormandy (Google Security) discovered multiple
vulnerabilities in
PCRE. He reported an error when processing "QE"
sequences with
unmatched "E" codes that can lead to the compiled
bytecode being
corrupted (CVE-2007-1659). PCRE does not properly calculate
sizes for
unspecified "multiple forms of character class",
which triggers a
buffer overflow (CVE-2007-1660). Further improper
calculations of
memory boundaries were reported when matching certain input
bytes
against regex patterns in non UTF-8 mode (CVE-2007-1661) and
when
searching for unmatched brackets or parentheses
(CVE-2007-1662).
Multiple integer overflows when processing escape sequences
may lead to
invalid memory read operations or potentially cause
heap-based buffer
overflows (CVE-2007-4766). PCRE does not properly handle
"P" and
"P" sequences which can lead to heap-based
buffer overflows or
trigger the execution of infinite loops (CVE-2007-4767),
PCRE is also
prone to an error when optimizing character classes
containing a
singleton UTF-8 sequence which might lead to a heap-based
buffer
overflow (CVE-2007-4768).

Chris Evans also reported multiple integer overflow
vulnerabilities in
PCRE when processing a large number of named subpatterns
("name_count")
or long subpattern names ("max_name_size")
(CVE-2006-7227), and via
large "min", "max", or
"duplength" values (CVE-2006-7228) both possibly
leading to buffer overflows. Another vulnerability was
reported when
compiling patterns where the "-x" or
"-i" UTF-8 options change within
the pattern, which might lead to improper memory
calculations
(CVE-2006-7230).

Impact
======

An attacker could exploit these vulnerabilities by sending
specially
crafted regular expressions to applications making use of
the PCRE
library, which could possibly lead to the execution of
arbitrary code,
a Denial of Service or the disclosure of sensitive
information.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All PCRE users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose
">=dev-libs/libpcre-7.3-r1"

References
==========

  [ 1 ] CVE-2006-7227
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-200
6-7227
  [ 2 ] CVE-2006-7228
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-200
6-7228
  [ 3 ] CVE-2006-7230
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-200
6-7230
  [ 4 ] CVE-2007-1659
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-200
7-1659
  [ 5 ] CVE-2007-1660
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-200
7-1660
  [ 6 ] CVE-2007-1661
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-200
7-1661
  [ 7 ] CVE-2007-1662
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-200
7-1662
  [ 8 ] CVE-2007-4766
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-200
7-4766
  [ 9 ] CVE-2007-4767
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-200
7-4767
  [ 10 ] CVE-2007-4768
         http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-200
7-4768

Availability
============

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

  ht
tp://security.gentoo.org/glsa/glsa-200711-30.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
securitygentoo.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).

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

http://
creativecommons.org/licenses/by-sa/2.5
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