Description
A privilege escalation flaw was found in the Xorg-x11-server due to a lack of authentication for X11 clients. This flaw allows an attacker to take control of an X application by impersonating the server it is expecting to connect to.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| — | xorg-x11-server | All | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 22.04 LTS | libx11 | No fix yet | — |
Show 4 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 20.04 LTS | libx11 | No fix yet | — |
| Ubuntu Pro 18.04 LTS | libx11 | No fix yet | — |
| Ubuntu Pro 16.04 LTS | libx11 | No fix yet | — |
| Ubuntu Pro 14.04 LTS | libx11 | No fix yet | — |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP5 | xtrans | 1.3.5-150000.3.3.1 | SUSE-SU-2023:3190-1 |
| SLES 15 SP4 | xtrans | 1.3.5-150000.3.3.1 | SUSE-SU-2023:3190-1 |
| SLES 12 SP5 | xtrans | 1.3.5-5.3.1 | SUSE-SU-2023:3189-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLE Real Time 15 SP3 | xtrans | 1.3.5-150000.3.3.1 | SUSE-SU-2023:3190-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | xtrans | 1.5.0-1.1 | openSUSE-SU-2024:12993-1 |
| openSUSE Leap 15.5 | xtrans | 1.3.5-150000.3.3.1 | SUSE-SU-2023:3190-1 |
| openSUSE Leap 15.4 | xtrans | 1.3.5-150000.3.3.1 | SUSE-SU-2023:3190-1 |
Advisories 4
- openSUSE-SU-2024:12993-1 xtrans-1.5.0-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2023:3189-1 Security update for xtrans SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2023:3190-1 Security update for xtrans SUSE / openSUSE Security Updates · May 2, 2025
- WID-SEC-2023-1966 X.Org X11: Schwachstelle ermöglicht Privilegieneskalation BSI CERT-Bund (WID) · Aug 3, 2023
References
- [oss-security] 20201109 The importance of mutual authentication: Local Privilege Escalation in X11 mailing-list
- [mina-dev] 20210225 [jira] [Created] (FTPSERVER-500) Security vulnerability in common/lib/log4j-1.2.17.jar mailing-list
- https://seclists.org/oss-sec/2020/q4/105
- https://bugzilla.redhat.com/show_bug.cgi?id=1895295