Debian DSA-3688-1 : nss - security update (Logjam) (SLOTH)

Severity

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Debian DSA-3688-1 : nss - security update (Logjam) (SLOTH)

critical Nessus Plugin ID 93871

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New! Plugin Severity Now Using CVSS v3

The calculated severity for Plugins has been updated to use CVSS v3 by default. Plugins that do not have a CVSS v3 score will fall back to CVSS v2 for calculating severity. Severity display preferences can be toggled in the settings dropdown.

Synopsis

The remote Debian host is missing a security-related update.

Description

Several vulnerabilities were discovered in NSS, the cryptography library developed by the Mozilla project.

- CVE-2015-4000 David Adrian et al. reported that it may be feasible to attack Diffie-Hellman-based cipher suites in certain circumstances, compromising the confidentiality and integrity of data encrypted with Transport Layer Security (TLS).

- CVE-2015-7181 CVE-2015-7182 CVE-2016-1950 Tyson Smith, David Keeler, and Francis Gabriel discovered heap-based buffer overflows in the ASN.1 DER parser, potentially leading to arbitrary code execution.

- CVE-2015-7575 Karthikeyan Bhargavan discovered that TLS client implementation accepted MD5-based signatures for TLS 1.2 connections with forward secrecy, weakening the intended security strength of TLS connections.

- CVE-2016-1938 Hanno Boeck discovered that NSS miscomputed the result of integer division for certain inputs. This could weaken the cryptographic protections provided by NSS.
However, NSS implements RSA-CRT leak hardening, so RSA private keys are not directly disclosed by this issue.

- CVE-2016-1978 Eric Rescorla discovered a use-after-free vulnerability in the implementation of ECDH-based TLS handshakes, with unknown consequences.

- CVE-2016-1979 Tim Taubert discovered a use-after-free vulnerability in ASN.1 DER processing, with application-specific impact.

- CVE-2016-2834 Tyson Smith and Jed Davis discovered unspecified memory-safety bugs in NSS.

In addition, the NSS library did not ignore environment variables in processes which underwent a SUID/SGID/AT_SECURE transition at process start. In certain system configurations, this allowed local users to escalate their privileges.

This update contains further correctness and stability fixes without immediate security impact.

Solution

Upgrade the nss packages.

For the stable distribution (jessie), these problems have been fixed in version 2:3.26-1+debu8u1.

Plugin Details

Severity: Critical

ID: 93871

File Name: debian_DSA-3688.nasl

Version: 2.8

Type: local

Agent: unix

Family: Debian Local Security Checks

Published: 10/6/2016

Updated: 1/11/2021

Dependencies: ssh_get_info.nasl

Risk Information

VPR

Risk Factor: Medium

Score: 5.9

CVSS v2

Risk Factor: High

Base Score: 9.3

Temporal Score: 6.9

Vector: AV:N/AC:M/Au:N/C:C/I:C/A:C

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

CVSS v3

Risk Factor: Critical

Base Score: 9.8

Temporal Score: 8.5

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

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

Vulnerability Information

CPE: p-cpe:/a:debian:debian_linux:nss, cpe:/o:debian:debian_linux:8.0

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

Exploit Ease: No known exploits are available

Patch Publication Date: 10/5/2016

Reference Information

CVE: CVE-2015-4000, CVE-2015-7181, CVE-2015-7182, CVE-2015-7575, CVE-2016-1938, CVE-2016-1950, CVE-2016-1978, CVE-2016-1979, CVE-2016-2834

DSA: 3688