Input validation error in GnuTLS

1) Input validation error

EUVDB-ID: #VU32394

Risk: Medium

CVSSv3.1: 4.6 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2015-6251

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

The vulnerability allows remote attackers to perform a denial of service (DoS) attack.

The vulnerability exists due to insufficient validation of user-supplied input. A remote attacker can cause a denial of service via a long DistinguishedName (DN) entry in a certificate.

Mitigation

Update to version 3.3.17.

Vulnerable software versions

GnuTLS: 3.3.0 - 3.3.16

External links

http://lists.fedoraproject.org/pipermail/package-announce/2015-September/165286.html
http://lists.opensuse.org/opensuse-updates/2015-09/msg00001.html
http://www.debian.org/security/2015/dsa-3334
http://www.gnutls.org/security.html#GNUTLS-SA-2015-3
http://www.openwall.com/lists/oss-security/2015/08/10/1
http://www.openwall.com/lists/oss-security/2015/08/17/6
http://www.securityfocus.com/bid/76267
http://www.securitytracker.com/id/1033226
http://bugzilla.redhat.com/show_bug.cgi?id=1251902
http://gitlab.com/gnutls/gnutls/commit/272854367efc130fbd4f1a51840d80c630214e12

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.