Home CVE Database CVE-2015-8994

CVE-2015-8994

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.

Priority: MEDIUM
CVSS v3: 7.5
Publish Date: Mar 2, 2017
Related ID: --
CVSS v2: High
Modified Date: Mar 2, 2017

Find out more about CVE-2015-8994 from the MITRE-CVE dictionary and NIST NVD


Products Affected

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Product Name Status Defect Fixed Downloads
Linux
Wind River Linux LTS 17 Not Vulnerable -- -- --
Wind River Linux 9 Fixed 9.0.0.5 Wind River Linux 9.0.0.5
Wind River Linux 8 Fixed LIN8-6059
8.0.0.16 Wind River Linux 8.0.0.16
Wind River Linux 8.0.0.17
Wind River Linux 8.0.0.18
Wind River Linux 8.0.0.19
Wind River Linux 8.0.0.20
Wind River Linux 8.0.0.21
Wind River Linux 8.0.0.22
Wind River Linux 8.0.0.23
Wind River Linux 8.0.0.24
Wind River Linux 8.0.0.25
Wind River Linux 8.0.0.26
Wind River Linux 8.0.0.27
Wind River Linux 8.0.0.28
Wind River Linux 8.0.0.29
Wind River Linux 8.0.0.30
Wind River Linux 8.0.0.31
Wind River Linux 8.0.0.32
Wind River Linux 8.0.0.33
Wind River Linux LTS 18 Not Vulnerable -- -- --
Wind River Linux LTS 19 Not Vulnerable -- -- --
Wind River Linux CD release Not Vulnerable -- -- --
VxWorks
VxWorks 7 Not Vulnerable -- -- --
VxWorks 6.9 Not Vulnerable -- -- --

Related Products

Product Name Status Defect Fixed Downloads
Linux 7 SCP Not Vulnerable -- -- --
Linux 7 CGP Not Vulnerable -- -- --

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