CVE-2015-8867

Severity: high (CVSS 7.5 v3.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 4.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2016-05-22 · updated 2026-06-17
Weakness: CWE-310

Description

The openssl_random_pseudo_bytes function in ext/openssl/openssl.c in PHP before 5.4.44, 5.5.x before 5.5.28, and 5.6.x before 5.6.12 incorrectly relies on the deprecated RAND_pseudo_bytes function, which makes it easier for remote attackers to defeat cryptographic protection mechanisms via unspecified vectors.

Affected products

Canonical Ubuntu Linux: 12.04, 14.04, 15.10
PHP: from 5.4.0 before 5.4.44; from 5.5.0 before 5.5.28; from 5.6.0 before 5.6.12 — fixed in 5.4.44, 5.5.28, 5.6.12

How to fix

Upgrade to a fixed version: PHP 5.4.44, 5.5.28, 5.6.12. Check the vendor advisory for mitigations.

References

http://git.php.net/?p=php-src.git%3Ba=commit%3Bh=16023f3e3b9c06cf677c3c980e8d574e4c162827
http://lists.opensuse.org/opensuse-security-announce/2016-05/msg00031.html
http://lists.opensuse.org/opensuse-security-announce/2016-05/msg00033.html
http://lists.opensuse.org/opensuse-security-announce/2016-05/msg00056.html
http://rhn.redhat.com/errata/RHSA-2016-2750.html
http://www.openwall.com/lists/oss-security/2016/04/24/1
http://www.php.net/ChangeLog-5.php
http://www.php.net/ChangeLog-7.php
http://www.ubuntu.com/usn/USN-2952-1
http://www.ubuntu.com/usn/USN-2952-2
https://bugs.launchpad.net/ubuntu/+source/php5/+bug/1534203
https://bugs.php.net/bug.php?id=70014

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