#VU32576 Permissions, Privileges, and Access Controls in GnuTLS - CVE-2014-1959

Vulnerability identifier: #VU32576

Vulnerability risk: Medium

CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2014-1959

CWE-ID: CWE-264

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
GnuTLS
Universal components / Libraries / Libraries used by multiple products

Vendor: GnuTLS

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

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

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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.