CVE-2016-8635

Publication date 17 November 2016

Last updated 25 August 2025

Ubuntu priority

Cvss 3 Severity Score

Description

It was found that Diffie Hellman Client key exchange handling in NSS 3.21.x was vulnerable to small subgroup confinement attack. An attacker could use this flaw to recover private keys by confining the client DH key to small subgroup of the desired group.

Status

Show unmaintained releases

Package	Ubuntu Release	Status
nss	17.04 zesty	Not affected
	16.10 yakkety	Not affected
	16.04 LTS xenial	Fixed 2:3.26.2-0ubuntu0.16.04.2
	14.04 LTS trusty	Fixed 2:3.26.2-0ubuntu0.14.04.3
	12.04 LTS precise	Fixed 2:3.26.2-0ubuntu0.12.04.1

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package	Patch details
nss	Vendor: https://git.centos.org/blob/rpms!nss!/aada6b10b73091276397404059605d13e7548462/SOURCES!moz-1314604.patch Upstream: https://hg.mozilla.org/projects/nss/rev/95bb47ef808b

Severity score breakdown

CVSS version: CVSS v3.0

Base score 5.9 · Medium

Base metrics

Parameter	Value
Attack vector	Network
Attack complexity	High
Privileges required	None
User interaction	None
Scope	Unchanged
Confidentiality impact	High
Integrity impact	None
Availability impact	None

Scores

Parameter	Value
Base score	5.9 · Medium
Exploitability score	-
Impact score	-

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

References

Related Ubuntu Security Notices (USN)

USN-3163-1
NSS vulnerabilities
4 January 2017

Other references

https://www.cve.org/CVERecord?id=CVE-2016-8635