Vulnerability identifier: #VU58333

Vulnerability risk: Low

CVSSv3.1: 6.1 [CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-41617

CWE-ID: CWE-269

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
OpenSSH
Server applications / Remote management servers, RDP, SSH

Vendor: OpenSSH

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
Install updates from vendor's website.

Vulnerable software versions

OpenSSH: 6.2 - 8.7p1

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External links
http://www.openwall.com/lists/oss-security/2021/09/26/1
http://www.openssh.com/txt/release-8.8
http://www.openssh.com/security.html
http://bugzilla.suse.com/show_bug.cgi?id=1190975
http://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/6XJIONMHMKZDTMH6BQR5TNLF2WDCGWED/
http://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/W44V2PFQH5YLRN6ZJTVRKAD7CU6CYYET/
http://security.netapp.com/advisory/ntap-20211014-0004/
http://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/KVI7RWM2JLNMWTOFK6BDUSGNOIPZYPUT/

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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.