PHP GENERATE_SEED security bypass

php-generateseed-security-bypass (42284) The risk level is classified as MediumMedium Risk

Description:

PHP, when running on 32-bit systems, could allow a remote attacker to bypass security restrictions. A multiplication process by the GENERATE_SEED macro function uses values which create a zero seed and makes a security bypass easier on the protection mechanism. A remote attacker could exploit this vulnerability to generate predictable random values for the rand and mt_rand functions and gain unauthorized access to the applications.

*CVSS:

Base Score: 5
  Access Vector: Network
  Access Complexity: Low
  Authentication: None
  Confidentiality Impact: None
  Integrity Impact: Partial
  Availability Impact: None
 
Temporal Score: 3.7
  Exploitability: Unproven
  Remediation Level: Official-Fix
  Report Confidence: Confirmed

Consequences:

Bypass Security

Remedy:

Upgrade to the latest version of PHP (5.2.6 or later), available from the PHP Web site. See References.

References:

  • Full-Disclosure Mailing List, Tue May 06 2008 - 03:16:01 CDT: Advisory SE-2008-02: PHP GENERATE_SEED() Weak Random Number Seed Vulnerability.
  • PHP Web site: PHP: Downloads.
  • ASA-2008-313: php security update (RHSA-2008-0544)
  • ASA-2008-320: php security and bug fix update (RHSA-2008-0545)
  • ASA-2008-325: php security update (RHSA-2008-0546)
  • ASA-2008-326: php security update (RHSA-2008-0582)
  • CVE-2008-2107: The GENERATE_SEED macro in PHP 4.x before 4.4.8 and 5.x before 5.2.5, when running on 32-bit systems, performs a multiplication using values that can produce a zero seed in rare circumstances, which allows context-dependent attackers to predict subsequent values of the rand and mt_rand functions and possibly bypass protection mechanisms that rely on an unknown initial seed.
  • DSA-1789: php5 -- several vulnerabilities
  • GLSA-200811-05: PHP: Multiple vulnerabilities
  • MDVSA-2008:125: Updated PHP packages fix multiple vulnerabilities
  • MDVSA-2008:126: Updated PHP packages fix multiple vulnerabilities
  • MDVSA-2008:127: Updated PHP packages fix multiple vulnerabilities
  • MDVSA-2008:128: Updated PHP packages fix multiple vulnerabilities
  • MDVSA-2008:129: Updated PHP packages fix multiple vulnerabilities
  • MDVSA-2008:130: Updated PHP packages fix multiple vulnerabilities
  • RHSA-2008-0505: Moderate: Red Hat Application Stack v2.1 security and enhancement update
  • RHSA-2008-0544: Moderate: php security update
  • RHSA-2008-0545: Moderate: php security and bug fix update
  • RHSA-2008-0546: Moderate: php security update
  • RHSA-2008-0582: Moderate: php security update
  • SUSE-SR:2008:014: [security-announce] SUSE Security Summary Report SUSE-SR:2008:014

Platforms Affected:

  • Canonical Ubuntu 6.06 LTS
  • Canonical Ubuntu 7.04
  • Canonical Ubuntu 7.10
  • Canonical Ubuntu 8.04 LTS
  • Debian Debian Linux 4.0
  • Debian Debian Linux 5.0
  • Gentoo Linux
  • MandrakeSoft Mandrake Linux 2007.1
  • MandrakeSoft Mandrake Linux 2007.1 X86_64
  • MandrakeSoft Mandrake Linux 2008.0 X86_64
  • MandrakeSoft Mandrake Linux 2008.0
  • MandrakeSoft Mandrake Linux 2008.1
  • MandrakeSoft Mandrake Linux 2008.1 X86_64
  • MandrakeSoft Mandrake Linux Corporate Server 3.0 X86_64
  • MandrakeSoft Mandrake Linux Corporate Server 3.0
  • 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 4.4.7
  • PHP PHP 5.0.0 RC2
  • PHP PHP 5.0.0 Beta2
  • PHP PHP 5.0.0 Beta3
  • PHP PHP 5.0.0 RC1
  • PHP PHP 5.0.0 Beta1
  • PHP PHP 5.0.0
  • PHP PHP 5.0.0 RC3
  • PHP PHP 5.0.1
  • PHP PHP 5.0.2
  • PHP PHP 5.0.3
  • PHP PHP 5.0.4
  • PHP PHP 5.0.5
  • PHP PHP 5.1.0
  • PHP PHP 5.1.1
  • PHP PHP 5.1.2
  • PHP PHP 5.1.3
  • PHP PHP 5.1.4
  • PHP PHP 5.1.5
  • PHP PHP 5.1.6
  • PHP PHP 5.2.0
  • PHP PHP 5.2.1
  • PHP PHP 5.2.2
  • PHP PHP 5.2.3
  • PHP PHP 5.2.4
  • RedHat Application Stack v1 for EL AS 4
  • RedHat Application Stack v1 for EL ES 4
  • RedHat Enterprise Linux 2.1 AS
  • RedHat Enterprise Linux 2.1 WS
  • RedHat Enterprise Linux 2.1 ES
  • RedHat Enterprise Linux 3 Desktop
  • RedHat Enterprise Linux 3 AS
  • RedHat Enterprise Linux 3 WS
  • RedHat Enterprise Linux 3 ES
  • RedHat Enterprise Linux 4 WS
  • RedHat Enterprise Linux 4 Desktop
  • RedHat Enterprise Linux 4 AS
  • RedHat Enterprise Linux 4 ES
  • RedHat Enterprise Linux 4.6.z AS
  • RedHat Enterprise Linux 4.6.z ES
  • RedHat Enterprise Linux 5
  • RedHat Enterprise Linux 5 Client Workstation
  • RedHat Enterprise Linux 5.2.z EUS
  • RedHat Linux Advanced Workstation 2.1 Itanium
  • RedHat RHEL Application Stack 2
  • Turbolinux Turbolinux 10 Server
  • Turbolinux Turbolinux 10 Server x64 Ed
  • Turbolinux Turbolinux 11 Server
  • Turbolinux Turbolinux 11 Server x64 Ed
  • 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:

May 06, 2008

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