Debian DLA-507-1 : nss security update (Logjam)

Medium Nessus Plugin ID 91505

Synopsis

The remote Debian host is missing a security update.

Description

A vulnerability has been found in nss.

CVE-2015-4000

With TLS protocol 1.2 and earlier, when a DHE_EXPORT ciphersuite is enabled on a server but not on a client, does not properly convey a DHE_EXPORT choice, which allows man-in-the-middle attackers to conduct cipher-downgrade attacks by rewriting a ClientHello with DHE replaced by DHE_EXPORT and then rewriting a ServerHello with DHE_EXPORT replaced by DHE, aka the 'Logjam' issue.

The solution in nss was to not accept bit lengths less than 1024. This may potentially be a backwards incompatibility issue but such low bit lengths should not be in use so it was deemed acceptable.

For Debian 7 'Wheezy', these problems have been fixed in version 2:3.14.5-1+deb7u7.

We recommend that you upgrade your nss packages.

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

Solution

Upgrade the affected packages.

See Also

https://lists.debian.org/debian-lts-announce/2016/06/msg00006.html

https://packages.debian.org/source/wheezy/nss

Plugin Details

Severity: Medium

ID: 91505

File Name: debian_DLA-507.nasl

Version: 2.4

Type: local

Agent: unix

Published: 2016/06/08

Updated: 2018/07/06

Dependencies: 12634

Risk Information

Risk Factor: Medium

CVSS v2.0

Base Score: 4.3

Temporal Score: 3.2

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

Temporal Vector: CVSS2#E:U/RL:OF/RC:C

CVSS v3.0

Base Score: 3.7

Temporal Score: 3.2

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

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: p-cpe:/a:debian:debian_linux:libnss3, p-cpe:/a:debian:debian_linux:libnss3-1d, p-cpe:/a:debian:debian_linux:libnss3-dbg, p-cpe:/a:debian:debian_linux:libnss3-dev, p-cpe:/a:debian:debian_linux:libnss3-tools, cpe:/o:debian:debian_linux:7.0

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

Exploit Available: false

Exploit Ease: No known exploits are available

Patch Publication Date: 2016/06/07

Reference Information

CVE: CVE-2015-4000

BID: 74733