RHSA-2010:0919 - Security Advisory

Topic

Updated php packages that fix multiple security issues are now available
for Red Hat Enterprise Linux 4 and 5.

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

An input validation flaw was discovered in the PHP session serializer. If a
PHP script generated session variable names from untrusted user input, a
remote attacker could use this flaw to inject an arbitrary variable into
the PHP session. (CVE-2010-3065)

An information leak flaw was discovered in the PHP var_export() function
implementation. If some fatal error occurred during the execution of this
function (such as the exhaustion of memory or script execution time limit),
part of the function's output was sent to the user as script output,
possibly leading to the disclosure of sensitive information.
(CVE-2010-2531)

A numeric truncation error and an input validation flaw were found in the
way the PHP utf8_decode() function decoded partial multi-byte sequences
for some multi-byte encodings, sending them to output without them being
escaped. An attacker could use these flaws to perform a cross-site
scripting attack. (CVE-2009-5016, CVE-2010-3870)

It was discovered that the PHP lcg_value() function used insufficient
entropy to seed the pseudo-random number generator. A remote attacker could
possibly use this flaw to predict values returned by the function, which
are used to generate session identifiers by default. This update changes
the function's implementation to use more entropy during seeding.
(CVE-2010-1128)

It was discovered that the PHP fnmatch() function did not restrict the
length of the pattern argument. A remote attacker could use this flaw to
crash the PHP interpreter where a script used fnmatch() on untrusted
matching patterns. (CVE-2010-1917)

A NULL pointer dereference flaw was discovered in the PHP XML-RPC
extension. A malicious XML-RPC client or server could use this flaw to
crash the PHP interpreter via a specially-crafted XML-RPC request.
(CVE-2010-0397)

All php users should upgrade to these updated packages, which contain
backported patches to resolve 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
http://kbase.redhat.com/faq/docs/DOC-11259

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 Server 4 x86_64
• Red Hat Enterprise Linux Server 4 ia64
• Red Hat Enterprise Linux Server 4 i386
• Red Hat Enterprise Linux for x86_64 - Extended Update Support 4.8 x86_64
• Red Hat Enterprise Linux for x86_64 - Extended Update Support 4.8 ia64
• Red Hat Enterprise Linux for x86_64 - Extended Update Support 4.8 i386
• Red Hat Enterprise Linux Workstation 5 x86_64
• Red Hat Enterprise Linux Workstation 5 i386
• Red Hat Enterprise Linux Workstation 4 x86_64
• Red Hat Enterprise Linux Workstation 4 ia64
• Red Hat Enterprise Linux Workstation 4 i386
• Red Hat Enterprise Linux Desktop 4 x86_64
• Red Hat Enterprise Linux Desktop 4 i386
• Red Hat Enterprise Linux for IBM z Systems 5 s390x
• Red Hat Enterprise Linux for IBM z Systems 4 s390x
• Red Hat Enterprise Linux for IBM z Systems 4 s390
• Red Hat Enterprise Linux for IBM z Systems - Extended Update Support 4.8 s390x
• Red Hat Enterprise Linux for IBM z Systems - Extended Update Support 4.8 s390
• Red Hat Enterprise Linux for Power, big endian 5 ppc
• Red Hat Enterprise Linux for Power, big endian 4 ppc
• Red Hat Enterprise Linux for Power, big endian - Extended Update Support 4.8 ppc
• Red Hat Enterprise Linux Server from RHUI 5 x86_64
• Red Hat Enterprise Linux Server from RHUI 5 i386

Fixes

• BZ - 573779 - CVE-2010-0397 php: NULL pointer dereference in XML-RPC extension
• BZ - 577582 - CVE-2010-1128 php: LCG entropy weakness
• BZ - 617232 - CVE-2010-1917 php: fnmatch long pattern stack memory exhaustion (MOPS-2010-021)
• BZ - 617673 - CVE-2010-2531 php: information leak vulnerability in var_export()
• BZ - 619030 - CVE-2010-3065 php: session serializer session data injection vulnerability (MOPS-2010-060)
• BZ - 649056 - CVE-2010-3870 php: XSS mitigation bypass via utf8_decode()
• BZ - 652836 - CVE-2009-5016 php: XSS and SQL injection bypass via crafted overlong UTF-8 encoded string

CVEs

• CVE-2010-3065
• CVE-2010-1917
• CVE-2010-2531
• CVE-2010-3870
• CVE-2010-0397
• CVE-2009-5016
• CVE-2010-1128

References

• http://www.redhat.com/security/updates/classification/#moderate