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.
Published 2017-03-02 06:59:00
Updated 2022-08-16 13:16:57
Source MITRE
View at NVD,   CVE.org

Threat overview for CVE-2015-8994

Top countries where our scanners detected CVE-2015-8994
Top open port discovered on systems with this issue 80
IPs affected by CVE-2015-8994 605,829
Threat actors abusing to this issue? Yes
Find out if you* are affected by CVE-2015-8994!
*Directly or indirectly through your vendors, service providers and 3rd parties. Powered by attack surface intelligence from SecurityScorecard.

Exploit prediction scoring system (EPSS) score for CVE-2015-8994

Probability of exploitation activity in the next 30 days: 0.45%

Percentile, the proportion of vulnerabilities that are scored at or less: ~ 72 % EPSS Score History EPSS FAQ

CVSS scores for CVE-2015-8994

Base Score Base Severity CVSS Vector Exploitability Score Impact Score Score Source
6.8
MEDIUM AV:N/AC:M/Au:N/C:P/I:P/A:P
8.6
6.4
NIST
7.5
HIGH CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
1.6
5.9
NIST

CWE ids for CVE-2015-8994

  • Assigned by: nvd@nist.gov (Primary)

References for CVE-2015-8994

Products affected by CVE-2015-8994

  • PHP » PHP
    Versions from including (>=) 5.0.0 and up to, including, (<=) 5.6.29
    cpe:2.3:a:php:php:*:*:*:*:*:*:*:*
  • PHP » PHP
    Versions from including (>=) 7.0.0 and before (<) 7.0.14
    cpe:2.3:a:php:php:*:*:*:*:*:*:*:*
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