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Debian Security Advisory DSA 3688-1 (nss - security update)

Information

Severity

Severity

Critical

Family

Family

Debian Local Security Checks

CVSSv2 Base

CVSSv2 Base

9.3

CVSSv2 Vector

CVSSv2 Vector

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

Solution Type

Solution Type

Vendor Patch

Created

Created

5 years ago

Modified

Modified

8 months ago

Summary

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.

Affected Software

Affected Software

nss on Debian Linux

Detection Method

Detection Method

This check tests the installed software version using the apt package manager.

Solution

Solution

For the stable distribution (jessie), these problems have been fixed in version 2:3.26-1+debu8u1. For the unstable distribution (sid), these problems have been fixed in version 2:3.23-1. We recommend that you upgrade your nss packages.