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PHP CVEs

Vulnerabilities in the PHP language itself, and which PHP versions they affect.

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CVE-2015-8994

HIGH 7.5 CVSS 3.1
Published
March 2, 2017
Last modified
June 17, 2026
NVD status
Modified
Reported by
cve@mitre.org
Weakness
CWE-264
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

Description

An issue was discovered in PHP 5.x and 7.x, when the configuration uses apache2handler/mod_php or php-fpm with OpCache enabled. With 5.x after 5.6.28 or 7.x after 7.0.13, the issue is resolved in a non-default configuration with the opcache.validate_permission=1 setting. The vulnerability details are as follows. In PHP SAPIs where PHP interpreters share a common parent process, Zend OpCache creates a shared memory object owned by the common parent during initialization. Child PHP processes inherit the SHM descriptor, using it to cache and retrieve compiled script bytecode ("opcode" in PHP jargon). Cache keys vary depending on configuration, but filename is a central key component, and compiled opcode can generally be run if a script's filename is known or can be guessed. Many common shared-hosting configurations change EUID in child processes to enforce privilege separation among hosted users (for example using mod_ruid2 for the Apache HTTP Server, or php-fpm user settings). In these scenarios, the default Zend OpCache behavior defeats script file permissions by sharing a single SHM cache among all child PHP processes. PHP scripts often contain sensitive information: Think of CMS configurations where reading or running another user's script usually means gaining privileges to the CMS database.

Affected products and versions

  • PHP — From 5.0.0 (including) to 5.6.29 (including)
  • PHP — From 7.0.0 (including) to 7.0.14 (excluding)

References

  • marc.info http://marc.info/?l=php-internals&m=147876797317925&w=2 Mailing List
  • marc.info http://marc.info/?l=php-internals&m=147921016724565&w=2 Mailing List
  • openwall.com http://openwall.com/lists/oss-security/2017/02/28/1 Mailing List
  • seclists.org http://seclists.org/oss-sec/2016/q4/343 Mailing List, Third Party Advisory
  • seclists.org http://seclists.org/oss-sec/2017/q1/520 Mailing List, Third Party Advisory
  • bugs.php.net https://bugs.php.net/bug.php?id=69090 Exploit, Issue Tracking
  • ma.ttias.be https://ma.ttias.be/a-better-way-to-run-php-fpm/ Exploit, Technical Description, Third Party Advisory
  • nvd.nist.gov Official NVD record