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CVE-2016-2119

Published: 7 July 2016

libcli/smb/smbXcli_base.c in Samba 4.x before 4.2.14, 4.3.x before 4.3.11, and 4.4.x before 4.4.5 allows man-in-the-middle attackers to bypass a client-signing protection mechanism, and consequently spoof SMB2 and SMB3 servers, via the (1) SMB2_SESSION_FLAG_IS_GUEST or (2) SMB2_SESSION_FLAG_IS_NULL flag.

Notes

AuthorNote
sbeattie
workaround in upstream report

Priority

Medium

Cvss 3 Severity Score

7.5

Score breakdown

Status

Package Release Status
samba
Launchpad, Ubuntu, Debian
precise Not vulnerable
(4.x only)
trusty
Released (2:4.3.11+dfsg-0ubuntu0.14.04.1)
upstream Needed

wily Ignored
(end of life)
xenial
Released (2:4.3.11+dfsg-0ubuntu0.16.04.1)
yakkety Not vulnerable
(2:4.4.5+dfsg-2ubuntu5)
zesty Not vulnerable
(2:4.4.5+dfsg-2ubuntu5)
samba4
Launchpad, Ubuntu, Debian
precise Ignored
(end of life)
trusty Does not exist

upstream Needs triage

wily Does not exist

xenial Does not exist

yakkety Does not exist

zesty Does not exist

Severity score breakdown

Parameter Value
Base score 7.5
Attack vector Network
Attack complexity High
Privileges required None
User interaction Required
Scope Unchanged
Confidentiality High
Integrity impact High
Availability impact High
Vector CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H