Detections
Analytics
GLSA-200711-30 : PCRE: Multiple vulnerabilities
high Nessus Plugin ID 28319
Synopsis
The remote Gentoo host is missing one or more security-related patches.Description
The remote host is affected by the vulnerability described in GLSA-200711-30 (PCRE: Multiple vulnerabilities)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.
Solution
All PCRE users should upgrade to the latest version:# emerge --sync # emerge --ask --oneshot --verbose '>=dev-libs/libpcre-7.3-r1'
See Also
Plugin Details
Severity: High
ID: 28319
File Name: gentoo_GLSA-200711-30.nasl
Version: 1.22
Type: local
Family: Gentoo Local Security Checks
Published: 11/26/2007
Updated: 1/6/2021
Supported Sensors: Nessus
Risk Information
VPR
Risk Factor: Medium
Score: 6.7
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: cpe:/o:gentoo:linux, p-cpe:/a:gentoo:linux:libpcre
Required KB Items: Host/local_checks_enabled, Host/Gentoo/release, Host/Gentoo/qpkg-list
Exploit Ease: No known exploits are available
Patch Publication Date: 11/20/2007
Reference Information
CVE: 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