CVE-2016-2125

Publication date 19 December 2016

Last updated 24 July 2024

Ubuntu priority

Cvss 3 Severity Score

It was found that Samba before versions 4.5.3, 4.4.8, 4.3.13 always requested forwardable tickets when using Kerberos authentication. A service to which Samba authenticated using Kerberos could subsequently use the ticket to impersonate Samba to other services or domain users.

From the Ubuntu Security Team

Simo Sorce discovered that that Samba clients always requested a forwardable ticket when using Kerberos authentication. An attacker could use this to impersonate an authenticated user or service.

Status

Show unmaintained releases

Package	Ubuntu Release	Status
samba	17.04 zesty	Fixed 2:4.4.5+dfsg-2ubuntu7
	16.10 yakkety	Fixed 2:4.4.5+dfsg-2ubuntu5.2
	16.04 LTS xenial	Fixed 2:4.3.11+dfsg-0ubuntu0.16.04.3
	14.04 LTS trusty	Fixed 2:4.3.11+dfsg-0ubuntu0.14.04.4
	12.04 LTS precise	Fixed 2:3.6.25-0ubuntu0.12.04.5
samba4	17.04 zesty	Not in release
	16.10 yakkety	Not in release
	16.04 LTS xenial	Not in release
	14.04 LTS trusty	Not in release
	12.04 LTS precise	Ignored

Severity score breakdown

Parameter	Value
Base score	6.5 · Medium
Attack vector	Adjacent
Attack complexity	Low
Privileges required	None
User interaction	None
Scope	Unchanged
Confidentiality	High
Integrity impact	None
Availability impact	None
Vector	CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

References

Related Ubuntu Security Notices (USN)

USN-3158-1
Samba vulnerabilities
19 December 2016