CVE-2015-8994 Information disclosure in n/a
Attackers can read or execute other users' PHP scripts via shared OpCache in shared hosting, exposing sensitive data and enabling privilege escalation.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2015-8994?
CVE-2015-8994 is a high-severity vulnerability in Php Php, published on 2 Mar 2017. Any signed-in user can exploit it over the network, with no action from the victim.
Official 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.
Weakness: CWE-264
Which versions are affected by CVE-2015-8994?
It affects 1 product.
Linux distribution packages (6)
php5 SUSE:Linux Enterprise Module for Web and Scripting 12 | All versions | 5.5.14-99.1 |
php7 SUSE:Linux Enterprise Module for Web and Scripting 12 | All versions | 7.0.7-38.1 |
php5 SUSE:Linux Enterprise Software Development Kit 12 SP1 | All versions | 5.5.14-99.1 |
php7 SUSE:Linux Enterprise Software Development Kit 12 SP1 | All versions | 7.0.7-38.1 |
php5 SUSE:Linux Enterprise Software Development Kit 12 SP2 | All versions | 5.5.14-99.1 |
php7 SUSE:Linux Enterprise Software Development Kit 12 SP2 | All versions | 7.0.7-38.1 |
Products include Php Php.
How do I fix CVE-2015-8994?
Change a configuration setting.
Is CVE-2015-8994 being exploited?
There is no known exploitation of CVE-2015-8994 in the wild and no public exploit code.
Other vulnerabilities in Php Php
Sources
Also known as GHSA-rfqg-6vj5-83j7, SUSE-SU-2017:0761-1, SUSE-SU-2017:0899-1, UBUNTU-CVE-2015-8994.