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AUSCERT External Security Bulletin Redistribution
Low: httpd security, bug fix, and enhancement update
9 January 2013
AusCERT Security Bulletin Summary
Publisher: Red Hat
Operating System: Red Hat Enterprise Linux Server 5
Red Hat Enterprise Linux WS/Desktop 5
Impact/Access: Cross-site Scripting -- Remote with User Interaction
Provide Misleading Information -- Remote with User Interaction
CVE Names: CVE-2012-2687 CVE-2008-0456 CVE-2008-0455
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Red Hat Security Advisory
Synopsis: Low: httpd security, bug fix, and enhancement update
Advisory ID: RHSA-2013:0130-01
Product: Red Hat Enterprise Linux
Advisory URL: https://rhn.redhat.com/errata/RHSA-2013-0130.html
Issue date: 2013-01-08
CVE Names: CVE-2008-0455 CVE-2008-0456 CVE-2012-2687
Updated httpd packages that fix multiple security issues, various bugs,
and add enhancements are now available for Red Hat Enterprise Linux 5.
The Red Hat Security Response Team has rated this update as having low
security impact. Common Vulnerability Scoring System (CVSS) base scores,
which give detailed severity ratings, are available for each vulnerability
from the CVE links in the References section.
2. Relevant releases/architectures:
RHEL Desktop Workstation (v. 5 client) - i386, x86_64
Red Hat Enterprise Linux (v. 5 server) - i386, ia64, ppc, s390x, x86_64
Red Hat Enterprise Linux Desktop (v. 5 client) - i386, x86_64
The httpd packages contain the Apache HTTP Server (httpd), which is the
namesake project of The Apache Software Foundation.
Input sanitization flaws were found in the mod_negotiation module. A remote
attacker able to upload or create files with arbitrary names in a directory
that has the MultiViews options enabled, could use these flaws to conduct
cross-site scripting and HTTP response splitting attacks against users
visiting the site. (CVE-2008-0455, CVE-2008-0456, CVE-2012-2687)
* Previously, no check was made to see if the
/etc/pki/tls/private/localhost.key file was a valid key prior to running
the "%post" script for the "mod_ssl" package. Consequently, when
/etc/pki/tls/certs/localhost.crt did not exist and "localhost.key" was
present but invalid, upgrading the Apache HTTP Server daemon (httpd) with
mod_ssl failed. The "%post" script has been fixed to test for an existing
SSL key. As a result, upgrading httpd with mod_ssl now proceeds as
* The "mod_ssl" module did not support operation under FIPS mode.
Consequently, when operating Red Hat Enterprise Linux 5 with FIPS mode
enabled, httpd failed to start. An upstream patch has been applied to
disable non-FIPS functionality if operating under FIPS mode and httpd now
starts as expected. (BZ#773473)
* Prior to this update, httpd exit status codes were not Linux Standard
Base (LSB) compliant. When the command "service httpd reload" was run and
httpd failed, the exit status code returned was "0" and not in the range 1
to 6 as expected. A patch has been applied to the init script and httpd now
returns "1" as an exit status code. (BZ#783242)
* Chunked Transfer Coding is described in RFC 2616. Previously, the
Apache server did not correctly handle a chunked encoded POST request with
a "chunk-size" or "chunk-extension" value of 32 bytes or more.
Consequently, when such a POST request was made the server did not respond.
An upstream patch has been applied and the problem no longer occurs.
* Due to a regression, when mod_cache received a non-cacheable 304
response, the headers were served incorrectly. Consequently, compressed
data could be returned to the client without the cached headers to indicate
the data was compressed. An upstream patch has been applied to merge
response and cached headers before data from the cache is served to the
client. As a result, cached data is now correctly interpreted by the
* In a proxy configuration, certain response-line strings were not handled
correctly. If a response-line without a "description" string was received
from the origin server, for a non-standard status code, such as the "450"
status code, a "500 Internal Server Error" would be returned to the client.
This bug has been fixed so that the original response line is returned to
the client. (BZ#853128)
* The configuration directive "LDAPReferrals" is now supported in addition
to the previously introduced "LDAPChaseReferrals". (BZ#727342)
* The AJP support module for "mod_proxy", "mod_proxy_ajp", now supports the
"ProxyErrorOverride" directive. Consequently, it is now possible to
configure customized error pages for web applications running on a backend
server accessed via AJP. (BZ#767890)
* The "%posttrans" scriptlet which automatically restarts the httpd service
after a package upgrade can now be disabled. If the file
/etc/sysconfig/httpd-disable-posttrans exists, the scriptlet will not
restart the daemon. (BZ#833042)
* The output of "httpd -S" now includes configured alias names for each
virtual host. (BZ#833043)
* New certificate variable names are now exposed by "mod_ssl" using the
"_DN_userID" suffix, such as "SSL_CLIENT_S_DN_userID", which use the
commonly used object identifier (OID) definition of "userID", OID
All users of httpd are advised to upgrade to these updated packages, which
fix these issues and add these enhancements.
Before applying this update, make sure all previously-released errata
relevant to your system have been applied.
This update is available via the Red Hat Network. Details on how to
use the Red Hat Network to apply this update are available at
5. Bugs fixed (http://bugzilla.redhat.com/):
727342 - LDAPChaseReferrals should be LDAPReferrals
752618 - mod_ssl post install script can cause failures
767890 - The mod_proxy_ajp lacks the ErrorOverride
773473 - [RHEL 5.7] Apache HTTP Server cannot start with mod_ssl when FIPS 140-2 mode enabled
783242 - service httpd reload return 0 when it fails
840845 - httpd fails in processing chunked requests with > 31 bytes chunk-size / -extension line
845532 - mod_cache regression in httpd 2.2.3-65: non-cacheable 304 responses serve bad data
850794 - CVE-2012-2687 CVE-2008-0455 httpd: mod_negotiation XSS via untrusted file names in directories with MultiViews enabled
879292 - CVE-2008-0456 httpd: mod_negotiation CRLF injection via untrusted file names in directories with MultiViews enabled
6. Package List:
Red Hat Enterprise Linux Desktop (v. 5 client):
RHEL Desktop Workstation (v. 5 client):
Red Hat Enterprise Linux (v. 5 server):
These packages are GPG signed by Red Hat for security. Our key and
details on how to verify the signature are available from
The Red Hat security contact is <firstname.lastname@example.org>. More contact
details at https://access.redhat.com/security/team/contact/
Copyright 2013 Red Hat, Inc.
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