Ubuntu update for openssh



Risk Low
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2021-41617
CWE-ID CWE-269
Exploitation vector Local
Public exploit N/A
Vulnerable software
 Ubuntu
Operating systems & Components / Operating system

openssh-server (Ubuntu package)
Operating systems & Components / Operating system package or component

Vendor Canonical Ltd.

Security Bulletin

This security bulletin contains one low risk vulnerability.

1) Improper Privilege Management

EUVDB-ID: #VU58333

Risk: Low

CVSSv4.0: 4.4 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2021-41617

CWE-ID: CWE-269 - Improper Privilege Management

Exploit availability: No

Description

The vulnerability allows a local user to escalate privileges.

The vulnerability exists due to improper privilege management in sshd, when certain non-default configurations are used, because supplemental groups are not initialized as expected. Helper programs for AuthorizedKeysCommand and AuthorizedPrincipalsCommand may run with privileges associated with group memberships of the sshd process, if the configuration specifies running the command as a different user. A local user can escalate privileges on the system.

Mitigation

Update the affected package openssh to the latest version.

Vulnerable software versions

Ubuntu: 16.04

openssh-server (Ubuntu package): before Ubuntu Pro (Infra-only)

CPE2.3 External links

https://ubuntu.com/security/notices/USN-5666-1


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.



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