#VU31457 Cryptographic issues in PHP - CVE-2015-8867

Vulnerability identifier: #VU31457

Vulnerability risk: Medium

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2015-8867

CWE-ID: CWE-310

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
PHP
Universal components / Libraries / Scripting languages

Vendor: PHP Group

Description

The vulnerability allows a remote non-authenticated attacker to gain access to sensitive information.

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.

Mitigation
Install update from vendor's website.

Vulnerable software versions

PHP: 5.6.0 - 5.6.11

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External links
https://git.php.net/?p=php-src.git;a=commit;h=16023f3e3b9c06cf677c3c980e8d574e4c162827
https://lists.opensuse.org/opensuse-security-announce/2016-05/msg00031.html
https://lists.opensuse.org/opensuse-security-announce/2016-05/msg00033.html
https://lists.opensuse.org/opensuse-security-announce/2016-05/msg00056.html
https://rhn.redhat.com/errata/RHSA-2016-2750.html
https://www.openwall.com/lists/oss-security/2016/04/24/1
https://www.php.net/ChangeLog-5.php
https://www.php.net/ChangeLog-7.php
https://www.ubuntu.com/usn/USN-2952-1
https://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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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.