Security Bulletin: ISC DHCP for IBM i is affected by CVE-2021-25217

Security Bulletin

Summary

ISC DHCP on IBM i is vulnerable to the issue described in the vulnerability details section. IBM i has addressed the vulnerability in the ISC DHCP implementation.

Vulnerability Details

CVEID: CVE-2021-25217
DESCRIPTION: ISC DHCP is vulnerable to a denial of service, caused by a buffer overrun in program code used to read and parse stored leases. A remote attacker from within the local network could exploit this vulnerability to cause a crash in the DHCP server or DHCP client.
CVSS Base score: 6.5
CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/202604 for the current score.
CVSS Vector: (CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/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 issue 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 containing the fix for the CVE are:

Release 7.4 - SI76506
Release 7.3 - SI76507
Release 7.2 - SI76509
Release 7.1 - SI76508

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

17 Sep 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: ISC DHCP for IBM i is affected by CVE-2021-25217