CVE-2022-2031
Publication date 27 July 2022
Last updated 24 July 2024
Ubuntu priority
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.
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.
Status
| Package | Ubuntu Release | Status |
|---|---|---|
| samba | 24.04 LTS noble |
Fixed 2:4.16.4+dfsg-2ubuntu1
|
| 22.04 LTS jammy |
Fixed 2:4.15.9+dfsg-0ubuntu0.2
|
|
| 20.04 LTS focal |
Fixed 2:4.13.17~dfsg-0ubuntu1.20.04.1
|
|
| 18.04 LTS bionic | Ignored | |
| 16.04 LTS xenial |
Vulnerable
|
|
| 14.04 LTS trusty |
Vulnerable
|
Notes
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.
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score |
8.8 · High
|
| 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 |
References
Related Ubuntu Security Notices (USN)
- USN-5542-1
- Samba vulnerabilities
- 1 August 2022