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National Vulnerability Database

National Vulnerability Database

NVD

National Vulnerability Database
  1. Vulnerabilities

CVE-2015-8994 Detail

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.


Metrics

 
NVD enrichment efforts reference publicly available information to associate vector strings. CVSS information contributed by other sources is also displayed.
CVSS 4.0 Severity and Vector Strings:

NIST CVSS score
NIST: NVD
N/A
NVD assessment not yet provided.

References to Advisories, Solutions, and Tools

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

Weakness Enumeration

CWE-ID CWE Name Source
CWE-264 Permissions, Privileges, and Access Controls cwe source acceptance level NIST  

Known Affected Software Configurations Switch to CPE 2.2

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Change History

4 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2015-8994
NVD Published Date:
03/02/2017
NVD Last Modified:
04/19/2025
Source:
MITRE