| Zusammenfassung: | 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. |
| Beschreibung: | 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/OS:
nss on Debian Linux
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.
CVSS Score:
9.3
CVSS Vector:
AV:N/AC:M/Au:N/C:C/I:C/A:C
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