Debian DSA-1399-1 : pcre3 - several vulnerabilities

high Nessus Plugin ID 27629

Synopsis

The remote Debian host is missing a security-related update.

Description

Tavis Ormandy of the Google Security Team has discovered several security issues in PCRE, the Perl-Compatible Regular Expression library, which potentially allow attackers to execute arbitrary code by compiling specially crafted regular expressions.

Version 7.0 of the PCRE library featured a major rewrite of the regular expression compiler, and it was deemed infeasible to backport the security fixes in version 7.3 to the versions in Debian's stable and oldstable distributions (6.7 and 4.5, respectively). Therefore, this update is based on version 7.4 (which includes the security bug fixes of the 7.3 version, plus several regression fixes), with special patches to improve the compatibility with the older versions. As a result, extra care is necessary when applying this update.

The Common Vulnerabilities and Exposures project identifies the following problems :

- CVE-2007-1659 Unmatched \Q\E sequences with orphan \E codes can cause the compiled regex to become desynchronized, resulting in corrupt bytecode that may result in multiple exploitable conditions.

- CVE-2007-1660 Multiple forms of character classes had their sizes miscalculated on initial passes, resulting in too little memory being allocated.

- CVE-2007-1661 Multiple patterns of the form \X?\d or \P{L}?\d in non-UTF-8 mode could backtrack before the start of the string, possibly leaking information from the address space, or causing a crash by reading out of bounds.

- CVE-2007-1662 A number of routines can be fooled into reading past the end of a string looking for unmatched parentheses or brackets, resulting in a denial of service.

- CVE-2007-4766 Multiple integer overflows in the processing of escape sequences could result in heap overflows or out of bounds reads/writes.

- CVE-2007-4767 Multiple infinite loops and heap overflows were discovered in the handling of \P and \P{x} sequences, where the length of these non-standard operations was mishandled.

- CVE-2007-4768 Character classes containing a lone unicode sequence were incorrectly optimised, resulting in a heap overflow.

Solution

For the old stable distribution (sarge), these problems have been fixed in version 4.5+7.4-1.

For the stable distribution (etch), these problems have been fixed in version 6.7+7.4-2.

Plugin Details

Severity: High

ID: 27629

File Name: debian_DSA-1399.nasl

Version: 1.29

Type: local

Agent: unix

Family: Debian Local Security Checks

Published: 11/6/2007

Updated: 1/4/2021

Supported Sensors: Agentless Assessment, Frictionless Assessment Agent, Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 5.8

CVSS v2

Risk Factor: High

Base Score: 7.5

Temporal Score: 5.5

Vector: CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P

Vulnerability Information

CPE: p-cpe:/a:debian:debian_linux:pcre3, cpe:/o:debian:debian_linux:3.1, cpe:/o:debian:debian_linux:4.0

Required KB Items: Host/local_checks_enabled, Host/Debian/release, Host/Debian/dpkg-l

Exploit Ease: No known exploits are available

Patch Publication Date: 11/5/2007

Reference Information

CVE: CVE-2007-1659, CVE-2007-1660, CVE-2007-1661, CVE-2007-1662, CVE-2007-4766, CVE-2007-4767, CVE-2007-4768

CWE: 119, 189

DSA: 1399

Detections

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