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Red Hat Security Advisory

Synopsis: Low: grep security and bug fix update
Advisory ID: RHSA-2015:2111-07
Product: Red Hat Enterprise Linux
Advisory URL: https://rhn.redhat.com/errata/RHSA-2015-2111.html
Issue date: 2015-11-19
CVE Names: CVE-2015-1345
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1. Summary:

Updated grep packages that fix one security issue and several bugs are now
available for Red Hat Enterprise Linux 7.

Red Hat Product Security has rated this update as having Low security
impact. A Common Vulnerability Scoring System (CVSS) base score, which
gives a detailed severity rating, is available from the CVE link in the
References section.

2. Relevant releases/architectures:

Red Hat Enterprise Linux Client (v. 7) – x86_64
Red Hat Enterprise Linux ComputeNode (v. 7) – x86_64
Red Hat Enterprise Linux Server (v. 7) – aarch64, ppc64, ppc64le, s390x, x86_64
Red Hat Enterprise Linux Workstation (v. 7) – x86_64

3. Description:

The grep utility searches through textual input for lines that contain a
match to a specified pattern and then prints the matching lines. The GNU
grep utilities include grep, egrep, and fgrep.

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)

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, using regular expressions
with “\w” and “\W” could lead to incorrect results. With this update, “\w”
is consistently matched to the [_[:alnum:]] character, and “\W” is
consistently matched to the [^_[:alnum:]] character. (BZ#1159012)

* Previously, the Perl Compatible Regular Expression (PCRE) matcher
(selected by the “-P” parameter in grep) did not work correctly when
matching non-UTF-8 text in UTF-8 locales. 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 grep utility. As a result,
PCRE now skips non-UTF-8 characters as non-matching text without returning
any error message. (BZ#1217080)

All grep users are advised to upgrade to these updated packages, which
contain backported patches to correct these issues.

4. Solution:

Before applying this update, make sure all previously released errata
relevant to your system have been applied.

For details on how to apply this update, refer to:

https://access.redhat.com/articles/11258

5. Bugs fixed (https://bugzilla.redhat.com/):

1103259 – undocumented option –fixed-regexp
1159012 – inconsistent \w and [[:alnum:]] behaviour
1183651 – CVE-2015-1345 grep: heap buffer overrun

6. Package List:

Red Hat Enterprise Linux Client (v. 7):

Source:
grep-2.20-2.el7.src.rpm

x86_64:
grep-2.20-2.el7.x86_64.rpm
grep-debuginfo-2.20-2.el7.x86_64.rpm

Red Hat Enterprise Linux ComputeNode (v. 7):

Source:
grep-2.20-2.el7.src.rpm

x86_64:
grep-2.20-2.el7.x86_64.rpm
grep-debuginfo-2.20-2.el7.x86_64.rpm

Red Hat Enterprise Linux Server (v. 7):

Source:
grep-2.20-2.el7.src.rpm

aarch64:
grep-2.20-2.el7.aarch64.rpm
grep-debuginfo-2.20-2.el7.aarch64.rpm

ppc64:
grep-2.20-2.el7.ppc64.rpm
grep-debuginfo-2.20-2.el7.ppc64.rpm

ppc64le:
grep-2.20-2.el7.ppc64le.rpm
grep-debuginfo-2.20-2.el7.ppc64le.rpm

s390x:
grep-2.20-2.el7.s390x.rpm
grep-debuginfo-2.20-2.el7.s390x.rpm

x86_64:
grep-2.20-2.el7.x86_64.rpm
grep-debuginfo-2.20-2.el7.x86_64.rpm

Red Hat Enterprise Linux Workstation (v. 7):

Source:
grep-2.20-2.el7.src.rpm

x86_64:
grep-2.20-2.el7.x86_64.rpm
grep-debuginfo-2.20-2.el7.x86_64.rpm

These packages are GPG signed by Red Hat for security. Our key and
details on how to verify the signature are available from
https://access.redhat.com/security/team/key/

7. References:

https://access.redhat.com/security/cve/CVE-2015-1345
https://access.redhat.com/security/updates/classification/#low

8. Contact:

The Red Hat security contact is <secalert@redhat.com>. More contact
details at https://access.redhat.com/security/team/contact/

Copyright 2015 Red Hat, Inc.
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