CVE-2015-8994

Priority
Low
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.
References
Bugs
Notes
 sbeattie> PEAR issues should go against php-pear as of xenial
 tyhicks> PHP7 < 7.0.14 and PHP5 < 5.6.29 are affected
Package
Source: php5 (LP Ubuntu Debian)
Upstream:needs-triage
Ubuntu 17.10 (Artful Aardvark):DNE
Ubuntu 12.04 ESM (Precise Pangolin):not-affected (code not present)
Ubuntu 14.04 LTS (Trusty Tahr):released (5.5.9+dfsg-1ubuntu4.22)
Ubuntu Core 15.04:DNE
Ubuntu 16.04 LTS (Xenial Xerus):DNE
Ubuntu 17.04 (Zesty Zapus):DNE
Patches:
Upstream:https://github.com/php/php-src/commit/ecba563f2fa1e027ea91b9ee0d50611273852995
Upstream:https://github.com/php/php-src/commit/8202b970777b84d57c590b78f9b6572ef0e0c205
Upstream:https://github.com/php/php-src/commit/9849c97b1bdfd7f0a7c499cad4cf601ebd68cc22
Package
Upstream:released (7.1.1-1)
Ubuntu 17.10 (Artful Aardvark):not-affected (7.1.4-2ubuntu1)
Ubuntu 12.04 ESM (Precise Pangolin):DNE
Ubuntu 14.04 LTS (Trusty Tahr):DNE
Ubuntu Core 15.04:DNE
Ubuntu 16.04 LTS (Xenial Xerus):DNE
Ubuntu 17.04 (Zesty Zapus):DNE
Package
Upstream:released (7.0.14-1)
Ubuntu 17.10 (Artful Aardvark):DNE
Ubuntu 12.04 ESM (Precise Pangolin):DNE
Ubuntu 14.04 LTS (Trusty Tahr):DNE
Ubuntu Core 15.04:DNE
Ubuntu 16.04 LTS (Xenial Xerus):not-affected (7.0.15-0ubuntu0.16.04.2)
Ubuntu 17.04 (Zesty Zapus):not-affected
Patches:
Upstream:http://git.php.net/?p=php-src.git;a=commit;h=ecba563f2fa1e027ea91b9ee0d50611273852995
More Information

Updated: 2017-08-11 23:54:10 UTC (commit 13081)