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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 |
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Title: PCRE: Multiple vulnerabilities |
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Date: November 20, 2007 |
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Bugs: #198198 |
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ID: 200711-30 |
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Synopsis |
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======== |
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|
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PCRE is vulnerable to multiple buffer overflow and memory corruption |
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vulnerabilities, possibly leading to the execution of arbitrary code. |
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|
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Background |
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========== |
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|
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PCRE is a library providing functions for Perl-compatible regular |
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expressions. |
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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 dev-libs/libpcre < 7.3-r1 >= 7.3-r1 |
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|
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Description |
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=========== |
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|
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Tavis Ormandy (Google Security) discovered multiple vulnerabilities in |
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PCRE. He reported an error when processing "\Q\E" sequences with |
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unmatched "\E" codes that can lead to the compiled bytecode being |
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corrupted (CVE-2007-1659). PCRE does not properly calculate sizes for |
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unspecified "multiple forms of character class", which triggers a |
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buffer overflow (CVE-2007-1660). Further improper calculations of |
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memory boundaries were reported when matching certain input bytes |
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against regex patterns in non UTF-8 mode (CVE-2007-1661) and when |
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searching for unmatched brackets or parentheses (CVE-2007-1662). |
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Multiple integer overflows when processing escape sequences may lead to |
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invalid memory read operations or potentially cause heap-based buffer |
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overflows (CVE-2007-4766). PCRE does not properly handle "\P" and |
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"\P{x}" sequences which can lead to heap-based buffer overflows or |
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trigger the execution of infinite loops (CVE-2007-4767), PCRE is also |
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prone to an error when optimizing character classes containing a |
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singleton UTF-8 sequence which might lead to a heap-based buffer |
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overflow (CVE-2007-4768). |
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|
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Chris Evans also reported multiple integer overflow vulnerabilities in |
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PCRE when processing a large number of named subpatterns ("name_count") |
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or long subpattern names ("max_name_size") (CVE-2006-7227), and via |
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large "min", "max", or "duplength" values (CVE-2006-7228) both possibly |
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leading to buffer overflows. Another vulnerability was reported when |
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compiling patterns where the "-x" or "-i" UTF-8 options change within |
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the pattern, which might lead to improper memory calculations |
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(CVE-2006-7230). |
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|
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Impact |
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====== |
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|
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An attacker could exploit these vulnerabilities by sending specially |
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crafted regular expressions to applications making use of the PCRE |
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library, which could possibly lead to the execution of arbitrary code, |
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a Denial of Service or the disclosure of sensitive information. |
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|
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Workaround |
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========== |
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|
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There is no known workaround at this time. |
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|
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Resolution |
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========== |
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|
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All PCRE users should upgrade to the latest version: |
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# emerge --sync |
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# emerge --ask --oneshot --verbose ">=dev-libs/libpcre-7.3-r1" |
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|
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References |
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========== |
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|
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[ 1 ] CVE-2006-7227 |
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http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-7227 |
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[ 2 ] CVE-2006-7228 |
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http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-7228 |
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[ 3 ] CVE-2006-7230 |
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http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-7230 |
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[ 4 ] CVE-2007-1659 |
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http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-1659 |
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[ 5 ] CVE-2007-1660 |
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http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-1660 |
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[ 6 ] CVE-2007-1661 |
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http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-1661 |
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[ 7 ] CVE-2007-1662 |
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http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-1662 |
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[ 8 ] CVE-2007-4766 |
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http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-4766 |
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[ 9 ] CVE-2007-4767 |
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http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-4767 |
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[ 10 ] CVE-2007-4768 |
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http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-4768 |
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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-200711-30.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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|
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Copyright 2007 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/2.5 |
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