Permissions, Privileges, and Access Controls in GnuTLS

1) Permissions, Privileges, and Access Controls

EUVDB-ID: #VU32576

Risk: Medium

CVSSv3.1: 5.7 [CVSS:3.1/CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2014-1959

CWE-ID: CWE-264 - Permissions, Privileges, and Access Controls

Exploit availability: No

Description

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

lib/x509/verify.c in GnuTLS before 3.1.21 and 3.2.x before 3.2.11 treats version 1 X.509 certificates as intermediate CAs, which allows remote attackers to bypass intended restrictions by leveraging a X.509 V1 certificate from a trusted CA to issue new certificates.

Mitigation

Install update from vendor's website.

Vulnerable software versions

GnuTLS: 3.1.0 - 3.1.20

External links

http://seclists.org/oss-sec/2014/q1/344
http://seclists.org/oss-sec/2014/q1/345
http://www.debian.org/security/2014/dsa-2866
http://www.gnutls.org/security.html
http://www.securityfocus.com/bid/65559
http://www.ubuntu.com/usn/USN-2121-1
http://www.gitorious.org/gnutls/gnutls/commit/b1abfe3d182d68539900092eb42fc62cf1bb7e7c

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.