Ubuntu update for openssh

1) Information disclosure

EUVDB-ID: #VU93514

Risk: Low

CVSSv4.0: 4.3 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2024-39894

CWE-ID: CWE-200 - Exposure of sensitive information to an unauthorized actor

Exploit availability: No

Description

The vulnerability allows a local user to gain access to potentially sensitive information.

The vulnerability exists due a logic error in ObscureKeystrokeTiming implementation within the ssh client. A local user with ability to passively observe SSH sessions can recover sensitive input, such as password for the su or sudo programs.

Mitigation

Update the affected package openssh to the latest version.

Vulnerable software versions

Ubuntu: 24.04

openssh-server (Ubuntu package): before 1:9.6p1-3ubuntu13.4

openssh-client (Ubuntu package): before 1:9.6p1-3ubuntu13.4

CPE2.3

• cpe:2.3:o:canonical:ubuntu:24.04:*:*:*:*:*:*:*
• 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-6887-1

Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

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