Security Bulletin: OpenSSH for IBM i is affected by CVE-2021-41617

Security Bulletin

Summary

OpenSSH on IBM i is vulnerable to the issue described in the vulnerability details section. The applicability of the vulnerability is determined by an application's specific use of OpenSSH. IBM i has addressed the CVE in the OpenSSH implementation.

Vulnerability Details

CVEID: CVE-2021-41617
DESCRIPTION: OpenSSH could allow a local attacker to gain elevated privileges on the system, caused by an error in sshd when certain non-default configurations are used. By executing an AuthorizedKeysCommand or AuthorizedPrincipalsCommand, where a AuthorizedKeysCommandUser or AuthorizedPrincipalsCommandUser directive has been set to run the command as a non-root user, an attacker could exploit this vulnerability to gain privileges associated with group memberships of the sshd process.
CVSS Base score: 7.4
CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/210062 for the current score.
CVSS Vector: (CVSS:3.0/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H)

Affected Products and Versions

Affected Product(s)	Version(s)
IBM i	7.4
IBM i	7.3
IBM i	7.2
IBM i	7.1

Remediation/Fixes

The issues can be fixed by applying a PTF to IBM i. Releases 7.4, 7.3, 7.2, and 7.1 of IBM i are supported and will be fixed.

The IBM i PTF numbers are:
Release 7.1 – SI77663
Release 7.2, 7.3, & 7.4 – SI77631
https://www.ibm.com/support/fixcentral

Important note: IBM recommends that all users running unsupported versions of affected products upgrade to supported and fixed version of affected products.

Workarounds and Mitigations

None

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References

Complete CVSS v3 Guide
On-line Calculator v3

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Change History

01 Dec 2021: Initial Publication

*The CVSS Environment Score is customer environment specific and will ultimately impact the Overall CVSS Score. Customers can evaluate the impact of this vulnerability in their environments by accessing the links in the Reference section of this Security Bulletin.

Disclaimer

Review the IBM security bulletin disclaimer and definitions regarding your responsibilities for assessing potential impact of security vulnerabilities to your environment.

Document Location

Worldwide

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Tips

Security Bulletin: OpenSSH for IBM i is affected by CVE-2021-41617