Ubuntu 12.04 LTS / 14.04 LTS / 15.10 : libtasn1-3, libtasn1-6 vulnerability (USN-2957-1)

Medium Nessus Plugin ID 90856


The remote Ubuntu host is missing one or more security-related patches.


Pascal Cuoq and Miod Vallat discovered that Libtasn1 incorrectly handled certain malformed DER certificates. A remote attacker could possibly use this issue to cause applications using Libtasn1 to hang, resulting in a denial of service.

Note that Tenable Network Security has extracted the preceding description block directly from the Ubuntu security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.


Update the affected libtasn1-3 and / or libtasn1-6 packages.

Plugin Details

Severity: Medium

ID: 90856

File Name: ubuntu_USN-2957-1.nasl

Version: $Revision: 2.5 $

Type: local

Agent: unix

Published: 2016/05/03

Modified: 2016/12/01

Dependencies: 12634

Risk Information

Risk Factor: Medium


Base Score: 4.3

Temporal Score: 3.6

Vector: CVSS2#AV:N/AC:M/Au:N/C:N/I:N/A:P

Temporal Vector: CVSS2#E:F/RL:OF/RC:ND


Base Score: 5.9

Temporal Score: 5.4

Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Temporal Vector: CVSS:3.0/E:F/RL:O/RC:X

Vulnerability Information

CPE: p-cpe:/a:canonical:ubuntu_linux:libtasn1-3, p-cpe:/a:canonical:ubuntu_linux:libtasn1-6, cpe:/o:canonical:ubuntu_linux:12.04:-:lts, cpe:/o:canonical:ubuntu_linux:14.04, cpe:/o:canonical:ubuntu_linux:15.10

Required KB Items: Host/cpu, Host/Ubuntu, Host/Ubuntu/release, Host/Debian/dpkg-l

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 2016/05/02

Reference Information

CVE: CVE-2016-4008

OSVDB: 136947

USN: 2957-1