Ubuntu update for openssh

1) Protection mechanism failure

EUVDB-ID: #VU107332

Risk: Low

CVSSv4.0: 0.6 [CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2025-32728

CWE-ID: CWE-693 - Protection Mechanism Failure

Exploit availability: No

Description

The vulnerability allows a remote user to bypass implemented security restrictions.

The vulnerability exists due to software does not properly handle the DisableForwarding directive, which does not disable X11 forwarding and agent forwarding as documented. A remote user can bypass expected application's behavior and bypass implemented security restrictions.

Mitigation

Update the affected package openssh to the latest version.

Vulnerable software versions

Ubuntu: 20.04 - 25.04

openssh-server (Ubuntu package): before 1:8.2p1-4ubuntu0.13

openssh-client (Ubuntu package): before 1:8.2p1-4ubuntu0.13

CPE2.3

• cpe:2.3:o:canonical:ubuntu:20.04:*:*:*:*:*:*:*
• cpe:2.3:o:canonical:ubuntu:22.04:*:*:*:*:*:*:*
• cpe:2.3:o:canonical:ubuntu:24.04:*:*:*:*:*:*:*
• cpe:2.3:o:canonical:ubuntu:24.10:*:*:*:*:*:*:*
• cpe:2.3:o:canonical:ubuntu:25.04:*:*:*:*:*:*:*
• cpe:2.3:a:canonical:openssh-server_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:openssh-client_ubuntu_package:*:*:*:*:*:ubuntu:*:*

External links

https://ubuntu.com/security/notices/USN-7457-1

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.