#VU32394 Input validation error in GnuTLS - CVE-2015-6251

Vulnerability identifier: #VU32394

Vulnerability risk: Medium

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

CVE-ID: CVE-2015-6251

CWE-ID: CWE-20

Exploitation vector: Network

Exploit availability: No

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

Vendor: GnuTLS

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

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

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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.