RHSA-2013:1814 - Security Advisory

Topic

Updated php packages that fix multiple security issues are now available
for Red Hat Enterprise Linux 5.

The Red Hat Security Response Team has rated this update as having critical
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

PHP is an HTML-embedded scripting language commonly used with the Apache
HTTP Server.

A memory corruption flaw was found in the way the openssl_x509_parse()
function of the PHP openssl extension parsed X.509 certificates. A remote
attacker could use this flaw to provide a malicious self-signed certificate
or a certificate signed by a trusted authority to a PHP application using
the aforementioned function, causing the application to crash or, possibly,
allow the attacker to execute arbitrary code with the privileges of the
user running the PHP interpreter. (CVE-2013-6420)

It was found that PHP did not check for carriage returns in HTTP headers,
allowing intended HTTP response splitting protections to be bypassed.
Depending on the web browser the victim is using, a remote attacker could
use this flaw to perform HTTP response splitting attacks. (CVE-2011-1398)

An integer signedness issue, leading to a heap-based buffer underflow, was
found in the PHP scandir() function. If a remote attacker could upload an
excessively large number of files to a directory the scandir() function
runs on, it could cause the PHP interpreter to crash or, possibly, execute
arbitrary code. (CVE-2012-2688)

It was found that the PHP SOAP parser allowed the expansion of external XML
entities during SOAP message parsing. A remote attacker could possibly use
this flaw to read arbitrary files that are accessible to a PHP application
using a SOAP extension. (CVE-2013-1643)

Red Hat would like to thank the PHP project for reporting CVE-2013-6420.
Upstream acknowledges Stefan Esser as the original reporter.

All php users are advised to upgrade to these updated packages, which
contain backported patches to correct these issues. After installing the
updated packages, the httpd daemon must be restarted for the update to
take effect.

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/site/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 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 - 828051 - CVE-2012-2688 php: Integer Signedness issues in _php_stream_scandir
• BZ - 853329 - CVE-2011-1398 PHP: sapi_header_op() %0D sequence handling security bypass
• BZ - 918187 - CVE-2013-1643 php: Ability to read arbitrary files due use of external entities while parsing SOAP WSDL files
• BZ - 1036830 - CVE-2013-6420 php: memory corruption in openssl_x509_parse()

CVEs

• CVE-2011-1398
• CVE-2012-2688
• CVE-2013-1643
• CVE-2013-6420

References

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