CVE-2016-6210

Publication date 18 July 2016

Last updated 25 August 2025

Ubuntu priority

Cvss 3 Severity Score

Description

sshd in OpenSSH before 7.3, when SHA256 or SHA512 are used for user password hashing, uses BLOWFISH hashing on a static password when the username does not exist, which allows remote attackers to enumerate users by leveraging the timing difference between responses when a large password is provided.

Status

Show unmaintained releases

Package	Ubuntu Release	Status
openssh	17.04 zesty	Not affected
	16.10 yakkety	Not affected
	16.04 LTS xenial	Fixed 1:7.2p2-4ubuntu2.1
	15.10 wily	Ignored end of life
	14.04 LTS trusty	Fixed 1:6.6p1-2ubuntu2.8
	12.04 LTS precise	Fixed 1:5.9p1-5ubuntu1.10

Patch details

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

Package	Patch details
openssh	Upstream: ?id=928 Upstream: ?id=283 Upstream: ?id=dbf

Severity score breakdown

Parameter	Value
Base score	5.9 · Medium
Attack vector	Network
Attack complexity	High
Privileges required	None
User interaction	None
Scope	Unchanged
Confidentiality	High
Integrity impact	None
Availability impact	None
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-3061-1
OpenSSH vulnerabilities
15 August 2016