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Vulnerability Details : CVE-2015-8994

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.
Publish Date : 2017-03-02 Last Update Date : 2022-08-16
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- CVSS Scores & Vulnerability Types

CVSS Score
6.8
Confidentiality Impact Partial (There is considerable informational disclosure.)
Integrity Impact Partial (Modification of some system files or information is possible, but the attacker does not have control over what can be modified, or the scope of what the attacker can affect is limited.)
Availability Impact Partial (There is reduced performance or interruptions in resource availability.)
Access Complexity Medium (The access conditions are somewhat specialized. Some preconditions must be satistified to exploit)
Authentication Not required (Authentication is not required to exploit the vulnerability.)
Gained Access None
Vulnerability Type(s) Gain privileges
CWE ID 264

- Products Affected By CVE-2015-8994

# Product Type Vendor Product Version Update Edition Language
1 Application PHP PHP * * * * Version Details Vulnerabilities

- Number Of Affected Versions By Product

Vendor Product Vulnerable Versions
PHP PHP 1

- References For CVE-2015-8994

http://marc.info/?l=php-internals&m=147876797317925&w=2
http://marc.info/?l=php-internals&m=147921016724565&w=2
http://seclists.org/oss-sec/2016/q4/343
http://seclists.org/oss-sec/2017/q1/520
https://bugs.php.net/bug.php?id=69090
https://ma.ttias.be/a-better-way-to-run-php-fpm/
http://openwall.com/lists/oss-security/2017/02/28/1

- Metasploit Modules Related To CVE-2015-8994

There are not any metasploit modules related to this CVE entry (Please visit www.metasploit.com for more information)


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