PHP ZVAL reference counter code execution

php-zval-code-execution (32796) The risk level is classified as MediumMedium Risk

Description:

PHP could allow a remote attacker to execute arbitrary code on the system, caused by an integer overflow in the ZVAL reference counter when handling strings from the unserialize function. By sending a specially-crafted request with an overly long string, a remote attacker could exploit this vulnerability to execute arbitrary code on the system or cause the application using the unserialize function to crash.

*CVSS:

Base Score: 5.6
  Access Vector: Remote
  Access Complexity: High
  Authentication: Not Required
  Confidentiality Impact: Partial
  Integrity Impact: Partial
  Availability Impact: Partial
 
Temporal Score: 4.4
  Exploitability: Proof-Of-Concept
  Remediation Level: Official-Fix
  Report Confidence: Confirmed

Consequences:

Gain Access

Remedy:

Upgrade to the latest version of PHP (4.4.5 or later), available from the PHP Web site. See References.

For Hewlett-Packard (PHP):
Refer to HPSBTU02232 SSRT071429 for patch, upgrade, or suggested workaround information. See References.

For Gentoo Linux (PHP):
Refer to GLSA 200705-19 for patch, upgrade, or suggested workaround information. See References.

For Debian GNU/Linux (PHP4):
Refer to DSA-1282-1 for patch, upgrade, or suggested workaround information. See References.

For Debian GNU/Linux (PHP5):
Refer to DSA-1283-1 for patch, upgrade, or suggested workaround information. See References.

For Turbolinux:
Refer to TLSA-2007-29 for patch, upgrade, or suggested workaround information. See References.

For other distributions:
Contact your vendor for upgrade or patch information.

References:

  • HPSBTU02232 SSRT071429 : Secure Web Server for HP Tru64 UNIX Powered by Apache (SWS) or HP Internet Express for Tru64 UNIX running PHP, Remote Arbitrary Code Execution, Unauthorized Disclosure of Information, or Denial of Service (DoS).
  • MOPB-04-2007: PHP 4 unserialize() ZVAL Reference Counter Overflow.
  • PHP Web site: PHP: Hypertext Preprocessor.
  • ASA-2007-195: php security update (RHSA-2007-0154)
  • ASA-2007-196: php security update (RHSA-2007-0155)
  • BID-22765: PHP ZVAL Reference Counter Integer Overflow Vulnerability
  • CVE-2007-1286: Integer overflow in PHP 4.4.4 and earlier allows remote context-dependent attackers to execute arbitrary code via a long string to the unserialize function, which triggers the overflow in the ZVAL reference counter.
  • DSA-1282: php4 -- several vulnerabilities
  • DSA-1283: php5 -- several vulnerabilities
  • GLSA-200703-21: PHP: Multiple vulnerabilities
  • GLSA-200705-19: PHP: Multiple vulnerabilities
  • MDKSA-2007:087: Updated php packages fix multiple vulnerabilities
  • MDKSA-2007:088: Updated php packages fix multiple vulnerabilities
  • OSVDB ID: 32771: PHP unserialize() ZVAL Reference Counter Remote Overflow
  • RHSA-2007-0154: Important: php security update
  • RHSA-2007-0155: Important: php security update
  • RHSA-2007-0163: Important: php security update for Stronghold
  • SA25423: HP System Management Homepage PHP Multiple Vulnerabilities
  • SA25850: HP Secure Web Server/Internet Express for Tru64 UNIX PHP Vulnerabilities

Platforms Affected:

  • Debian Debian Linux 3.1
  • Debian Debian Linux 4.0
  • Gentoo Linux
  • HP Internet Express 6.6
  • HP Secure Web Server for Tru64 6.6.4
  • MandrakeSoft Mandrake Linux Corporate Server 3.0
  • MandrakeSoft Mandrake Linux Corporate Server 3.0 X86_64
  • MandrakeSoft Mandrake Linux Corporate Server 4.0 X86_64
  • MandrakeSoft Mandrake Linux Corporate Server 4.0
  • MandrakeSoft Mandrake Multi Network Firewall 2.0
  • PHP PHP 4.0 RC1
  • PHP PHP 4.0 Beta4
  • PHP PHP 4.0 Beta3
  • PHP PHP 4.0 Beta2
  • PHP PHP 4.0 Beta1
  • PHP PHP 4.0 Beta 4 Patch1
  • PHP PHP 4.0 RC2
  • PHP PHP 4.0.0
  • PHP PHP 4.0.1
  • PHP PHP 4.0.2
  • PHP PHP 4.0.3
  • PHP PHP 4.0.4
  • PHP PHP 4.0.5
  • PHP PHP 4.0.6
  • PHP PHP 4.0.7
  • PHP PHP 4.1.0
  • PHP PHP 4.1.1
  • PHP PHP 4.1.2
  • PHP PHP 4.1.3
  • PHP PHP 4.2.0
  • PHP PHP 4.2.1
  • PHP PHP 4.2.2
  • PHP PHP 4.2.3
  • PHP PHP 4.2.4
  • PHP PHP 4.3.0
  • PHP PHP 4.3.1
  • PHP PHP 4.3.10
  • PHP PHP 4.3.11
  • PHP PHP 4.3.2
  • PHP PHP 4.3.3
  • PHP PHP 4.3.4
  • PHP PHP 4.3.5
  • PHP PHP 4.3.6
  • PHP PHP 4.3.7
  • PHP PHP 4.3.8
  • PHP PHP 4.3.9
  • PHP PHP 4.4.0
  • PHP PHP 4.4.1
  • PHP PHP 4.4.2
  • PHP PHP 4.4.3
  • PHP PHP 4.4.4
  • RedHat Enterprise Linux 2.1 AS
  • RedHat Enterprise Linux 2.1 ES
  • RedHat Enterprise Linux 2.1 WS
  • RedHat Enterprise Linux 3 Desktop
  • RedHat Enterprise Linux 3 WS
  • RedHat Enterprise Linux 3 ES
  • RedHat Enterprise Linux 3 AS
  • RedHat Enterprise Linux 4 Desktop
  • RedHat Enterprise Linux 4 WS
  • RedHat Enterprise Linux 4 ES
  • RedHat Enterprise Linux 4 AS
  • RedHat Linux Advanced Workstation 2.1 Itanium
  • RedHat Stronghold
  • Turbolinux Turbolinux 10 Desktop
  • Turbolinux Turbolinux 10 F...
  • Turbolinux Turbolinux 10 Server
  • Turbolinux Turbolinux 10 Server x64 Ed
  • Turbolinux Turbolinux 8 Server
  • Turbolinux Turbolinux Home
  • Turbolinux Turbolinux Multimedia
  • Turbolinux Turbolinux Personal
  • Turbolinux Turbolinux Appliance Server 1.0 Hosting Ed
  • Turbolinux Turbolinux Appliance Server 1.0 Workgroup Ed
  • Turbolinux Turbolinux Appliance Server 2.0

Reported:

Mar 02, 2007

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