CVE-2015-2721

MEDIUM

Description

Mozilla Network Security Services (NSS) before 3.19, as used in Mozilla Firefox before 39.0, Firefox ESR 31.x before 31.8 and 38.x before 38.1, Thunderbird before 38.1, and other products, does not properly determine state transitions for the TLS state machine, which allows man-in-the-middle attackers to defeat cryptographic protection mechanisms by blocking messages, as demonstrated by removing a forward-secrecy property by blocking a ServerKeyExchange message, aka a "SMACK SKIP-TLS" issue.

References

http://lists.opensuse.org/opensuse-security-announce/2015-07/msg00025.html

http://lists.opensuse.org/opensuse-security-announce/2015-07/msg00031.html

http://lists.opensuse.org/opensuse-security-announce/2015-07/msg00033.html

http://lists.opensuse.org/opensuse-security-announce/2015-07/msg00034.html

http://lists.opensuse.org/opensuse-security-announce/2015-08/msg00021.html

http://rhn.redhat.com/errata/RHSA-2015-1185.html

http://rhn.redhat.com/errata/RHSA-2015-1664.html

http://www.debian.org/security/2015/dsa-3324

http://www.debian.org/security/2015/dsa-3336

http://www.mozilla.org/security/announce/2015/mfsa2015-71.html

http://www.oracle.com/technetwork/security-advisory/cpuapr2016v3-2985753.html

http://www.oracle.com/technetwork/security-advisory/cpujul2016-2881720.html

http://www.oracle.com/technetwork/topics/security/bulletinapr2016-2952098.html

http://www.oracle.com/technetwork/topics/security/bulletinoct2015-2511968.html

http://www.oracle.com/technetwork/topics/security/ovmbulletinjul2016-3090546.html

http://www.securityfocus.com/bid/75541

http://www.securityfocus.com/bid/83398

http://www.securityfocus.com/bid/91787

http://www.securitytracker.com/id/1032783

http://www.securitytracker.com/id/1032784

http://www.ubuntu.com/usn/USN-2656-1

http://www.ubuntu.com/usn/USN-2656-2

http://www.ubuntu.com/usn/USN-2672-1

http://www.ubuntu.com/usn/USN-2673-1

https://bugzilla.mozilla.org/show_bug.cgi?id=1086145

https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSS/NSS_3.19_release_notes

https://security.gentoo.org/glsa/201512-10

https://security.gentoo.org/glsa/201701-46

https://smacktls.com

Details

Source: MITRE

Published: 2015-07-06

Updated: 2018-01-05

Type: CWE-310

Risk Information

CVSS v2.0

Base Score: 4.3

Vector: (AV:N/AC:M/Au:N/C:N/I:P/A:N)

Impact Score: 2.9

Exploitability Score: 8.6

Severity: MEDIUM