Vulnerability identifier: #VU42278

Vulnerability risk: Medium

CVSSv3.1: 6.4 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2013-6386

CWE-ID: CWE-310

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Drupal
Web applications / CMS

Vendor: Drupal

Description

The vulnerability allows a remote non-authenticated attacker to read and manipulate data.

Drupal 6.x before 6.29 and 7.x before 7.24 uses the PHP mt_rand function to generate random numbers, which uses predictable seeds and allows remote attackers to predict security strings and bypass intended restrictions via a brute force attack.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Drupal: 7.0 - 7.x-dev, 6.0 - 6.28

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External links
http://secunia.com/advisories/56148
http://www.debian.org/security/2013/dsa-2804
http://www.debian.org/security/2013/dsa-2828
http://www.openwall.com/lists/oss-security/2013/11/22/4
http://drupal.org/SA-CORE-2013-003

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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.