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Scientific Linux Security Update : grep on SL6.x i386/x86_64 (20150722)
medium Nessus Plugin ID 85194
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Synopsis
The remote Scientific Linux host is missing one or more security updates.Description
An integer overflow flaw, leading to a heap-based buffer overflow, was found in the way grep parsed large lines of data. An attacker able to trick a user into running grep on a specially crafted data file could use this flaw to crash grep or, potentially, execute arbitrary code with the privileges of the user running grep. (CVE-2012-5667)A heap-based buffer overflow flaw was found in the way grep processed certain pattern and text combinations. An attacker able to trick a user into running grep on specially crafted input could use this flaw to crash grep or, potentially, read from uninitialized memory.
(CVE-2015-1345)
The grep packages have been upgraded to upstream version 2.20, which provides a number of bug fixes and enhancements over the previous version. Notably, the speed of various operations has been improved significantly. Now, the recursive grep utility uses the fts function of the gnulib library for directory traversal, so that it can handle much larger directories without reporting the 'File name too long' error message, and it can operate faster when dealing with large directory hierarchies.
This update also fixes the following bugs :
- Prior to this update, the \w and \W symbols were inconsistently matched to the [:alnum:] character class.
Consequently, regular expressions that used \w and \W in some cases had incorrect results. An upstream patch which fixes the matching problem has been applied, and \w is now matched to the [_[:alnum:]] character and \W to the [^_[:alnum:]] character consistently.
- Previously, the '--fixed-regexp' command-line option was not included in the grep(1) manual page. Consequently, the manual page was inconsistent with the built-in help of the grep utility. To fix this bug, grep(1) has been updated to include a note informing the user that '--fixed-regexp' is an obsolete option. Now, the built-in help and manual page are consistent regarding the '--fixed-regexp' option.
- Previously, the Perl Compatible Regular Expression (PCRE) library did not work correctly when matching non-UTF-8 text in UTF-8 mode. Consequently, an error message about invalid UTF-8 byte sequence characters was returned. To fix this bug, patches from upstream have been applied to the PCRE library and the grep utility.
As a result, PCRE now skips non-UTF-8 characters as non-matching text without returning any error message.
Solution
Update the affected grep and / or grep-debuginfo packages.See Also
Plugin Details
Severity: Medium
ID: 85194
File Name: sl_20150722_grep_on_SL6_x.nasl
Version: 2.4
Type: local
Agent: unix
Published: 8/4/2015
Updated: 1/14/2021
Supported Sensors: Nessus Agent, Nessus
Risk Information
VPR
Risk Factor: Medium
Score: 6.7
CVSS v2
Risk Factor: Medium
Base Score: 4.4
Vector: CVSS2#AV:L/AC:M/Au:N/C:P/I:P/A:P
Vulnerability Information
CPE: p-cpe:/a:fermilab:scientific_linux:grep, p-cpe:/a:fermilab:scientific_linux:grep-debuginfo, x-cpe:/o:fermilab:scientific_linux
Required KB Items: Host/local_checks_enabled, Host/RedHat/release, Host/RedHat/rpm-list, Host/cpu
Patch Publication Date: 7/22/2015
Vulnerability Publication Date: 1/3/2013
Reference Information
CVE: CVE-2012-5667, CVE-2015-1345