RHSA-2013:0130 - Security Advisory

Topic

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.

Description

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)

Bug fixes:

• 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
expected. (BZ#752618)

• 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.
(BZ#840845)

• 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
client. (BZ#845532)

• 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)

Enhancements:

• 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
0.9.2342.19200300.100.1.1. (BZ#840036)

All users of httpd are advised to upgrade to these updated packages, which
fix these issues and add these enhancements.

Solution

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

Affected Products

• Red Hat Enterprise Linux Server 5 x86_64
• Red Hat Enterprise Linux Server 5 ia64
• Red Hat Enterprise Linux Server 5 i386
• Red Hat Enterprise Linux Workstation 5 x86_64
• Red Hat Enterprise Linux Workstation 5 i386
• Red Hat Enterprise Linux Desktop 5 x86_64
• Red Hat Enterprise Linux Desktop 5 i386
• Red Hat Enterprise Linux for IBM z Systems 5 s390x
• Red Hat Enterprise Linux for Power, big endian 5 ppc
• Red Hat Enterprise Linux Server from RHUI 5 x86_64
• Red Hat Enterprise Linux Server from RHUI 5 i386

Fixes

• BZ - 727342 - LDAPChaseReferrals should be LDAPReferrals
• BZ - 752618 - mod_ssl post install script can cause failures
• BZ - 767890 - The mod_proxy_ajp lacks the ErrorOverride
• BZ - 773473 - [RHEL 5.7] Apache HTTP Server cannot start with mod_ssl when FIPS 140-2 mode enabled
• BZ - 783242 - service httpd reload return 0 when it fails
• BZ - 840845 - httpd fails in processing chunked requests with > 31 bytes chunk-size / -extension line
• BZ - 845532 - mod_cache regression in httpd 2.2.3-65: non-cacheable 304 responses serve bad data
• BZ - 850794 - CVE-2012-2687 CVE-2008-0455 httpd: mod_negotiation XSS via untrusted file names in directories with MultiViews enabled
• BZ - 879292 - CVE-2008-0456 httpd: mod_negotiation CRLF injection via untrusted file names in directories with MultiViews enabled

CVEs

• CVE-2008-0455
• CVE-2012-2687
• CVE-2008-0456

References

• https://access.redhat.com/security/updates/classification/#low