NVD - CVE-2015-8994

CVE-2015-8994 Detail

Current 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.

Source: MITRE
Description Last Modified: 03/02/2017
View Analysis Description

Impact

CVSS v3.0 Severity and Metrics:

Base Score: 7.5 HIGH
Vector: AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H (V3 legend)
Impact Score: 5.9
Exploitability Score: 1.6

Attack Vector (AV): Network
Attack Complexity (AC): High
Privileges Required (PR): Low
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): High
Integrity (I): High
Availability (A): High

CVSS v2.0 Severity and Metrics:

Base Score: 6.8 MEDIUM
Vector: (AV:N/AC:M/Au:N/C:P/I:P/A:P) (V2 legend)
Impact Subscore: 6.4
Exploitability Subscore: 8.6

Access Vector (AV): Network
Access Complexity (AC): Medium
Authentication (AU): None
Confidentiality (C): Partial
Integrity (I): Partial
Availability (A): Partial
Additional Information:
Allows unauthorized disclosure of information
Allows unauthorized modification
Allows disruption of service

References to Advisories, Solutions, and Tools

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

Technical Details

Vulnerability Type (View All)

Permissions, Privileges, and Access Control (CWE-264)

Vulnerable software and versions Switch to CPE 2.2

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Change History

1 change record found - show changes

Initial Analysis - 3/16/2017 10:40:13 AM

Action	Type	Old Value	New Value
Added	CPE Configuration		Record truncated, showing 500 of 9522 characters. View Entire Change Record OR cpe:2.3:a:php:php:5.0.0::::::: cpe:2.3:a:php:php:5.0.0:beta1::::::* cpe:2.3:a:php:php:5.0.0:beta2::::::* cpe:2.3:a:php:php:5.0.0:beta3::::::* cpe:2.3:a:php:php:5.0.0:beta4::::::* cpe:2.3:a:php:php:5.0.0:rc1::::::* cpe:2.3:a:php:php:5.0.0:rc2::::::* cpe:2.3:a:php:php:5.0.0:rc3::::::* cpe:2.3:a:php:php:5.0.1::::::: cpe:2.3:a:php:php:5.0.2::::::: cpe:2.3:a:php:php:5.0.3:::
Added	CVSS V2		(AV:N/AC:M/Au:N/C:P/I:P/A:P)
Added	CVSS V3		AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Added	CWE		CWE-264
Changed	Reference Type	http://marc.info/?l=php-internals&m=147876797317925&w=2 No Types Assigned	http://marc.info/?l=php-internals&m=147876797317925&w=2 Mailing List
Changed	Reference Type	http://marc.info/?l=php-internals&m=147921016724565&w=2 No Types Assigned	http://marc.info/?l=php-internals&m=147921016724565&w=2 Mailing List
Changed	Reference Type	http://openwall.com/lists/oss-security/2017/02/28/1 No Types Assigned	http://openwall.com/lists/oss-security/2017/02/28/1 Mailing List
Changed	Reference Type	http://seclists.org/oss-sec/2016/q4/343 No Types Assigned	http://seclists.org/oss-sec/2016/q4/343 Mailing List
Changed	Reference Type	http://seclists.org/oss-sec/2017/q1/520 No Types Assigned	http://seclists.org/oss-sec/2017/q1/520 Mailing List
Changed	Reference Type	https://bugs.php.net/bug.php?id=69090 No Types Assigned	https://bugs.php.net/bug.php?id=69090 Exploit, Issue Tracking
Changed	Reference Type	https://ma.ttias.be/a-better-way-to-run-php-fpm/ No Types Assigned	https://ma.ttias.be/a-better-way-to-run-php-fpm/ Exploit, Technical Description, Third Party Advisory

Quick Info

CVE Dictionary Entry:
CVE-2015-8994
NVD Published Date:
03/02/2017
NVD Last Modified:
03/16/2017

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Information Technology Laboratory

National Vulnerability Database