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Gentoo Linux Security Advisory 200711-30

Gentoo Linux Security Advisory 200711-30
Posted Nov 26, 2007
Authored by Gentoo | Site security.gentoo.org

Gentoo Linux Security Advisory GLSA 200711-30 - Tavis Ormandy (Google Security) discovered multiple vulnerabilities in PCRE. He reported an error when processing \Q\E sequences with unmatched \E codes that can lead to the compiled bytecode being corrupted. PCRE does not properly calculate sizes for unspecified multiple forms of character class, which triggers a buffer overflow. Further improper calculations of memory boundaries were reported when matching certain input bytes against regex patterns in non UTF-8 mode and when searching for unmatched brackets or parentheses. Multiple integer overflows when processing escape sequences may lead to invalid memory read operations or potentially cause heap-based buffer overflows. PCRE does not properly handle \P and \P{x} sequences which can lead to heap-based buffer overflows or trigger the execution of infinite loops, 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. Versions less than 7.3-r1 are affected.

tags | advisory, overflow, vulnerability
systems | linux, gentoo
advisories | CVE-2006-7227, CVE-2006-7228, CVE-2006-7230, CVE-2007-1659, CVE-2007-1660, CVE-2007-1661, CVE-2007-1662, CVE-2007-4766, CVE-2007-4767, CVE-2007-4768
MD5 | 52301116aa5ae4963242b6577a6a61d2

Gentoo Linux Security Advisory 200711-30

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Gentoo Linux Security Advisory GLSA 200711-30
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http://security.gentoo.org/
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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 "\Q\E" 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{x}" 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-2006-7227
[ 2 ] CVE-2006-7228
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-7228
[ 3 ] CVE-2006-7230
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-7230
[ 4 ] CVE-2007-1659
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-1659
[ 5 ] CVE-2007-1660
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-1660
[ 6 ] CVE-2007-1661
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-1661
[ 7 ] CVE-2007-1662
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-1662
[ 8 ] CVE-2007-4766
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-4766
[ 9 ] CVE-2007-4767
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-4767
[ 10 ] CVE-2007-4768
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-4768

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

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

http://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
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).

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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