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CVE-2022-2031

Published: 27 July 2022

A flaw was found in Samba. The security vulnerability occurs when KDC and the kpasswd service share a single account and set of keys, allowing them to decrypt each other's tickets. A user who has been requested to change their password, can exploit this flaw to obtain and use tickets to other services.

Notes

AuthorNote
mdeslaur
Fixing this in Ubuntu 18.04 LTS would require substantial
code backports. We will not be fixing this issue in Ubuntu 18.04
LTS. In environments where this is of concern, we recommend
updating to a more recent Ubuntu version, or disabling kpasswd
if this is not passible.

Mitigation

kpasswd is not a critical protocol for the AD DC in most installations, it
can be disabled by setting "kpasswd port = 0" in the smb.conf.

Priority

Medium

Cvss 3 Severity Score

8.8

Score breakdown

Status

Package Release Status
samba
Launchpad, Ubuntu, Debian
bionic Ignored

trusty Needed

impish Ignored
(end of life)
upstream Needs triage

focal
Released (2:4.13.17~dfsg-0ubuntu1.20.04.1)
jammy
Released (2:4.15.9+dfsg-0ubuntu0.2)
kinetic
Released (2:4.16.4+dfsg-2ubuntu1)
lunar
Released (2:4.16.4+dfsg-2ubuntu1)
xenial Needed

mantic
Released (2:4.16.4+dfsg-2ubuntu1)

Severity score breakdown

Parameter Value
Base score 8.8
Attack vector Network
Attack complexity Low
Privileges required Low
User interaction None
Scope Unchanged
Confidentiality High
Integrity impact High
Availability impact High
Vector CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H