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Security Bulletin: BIND for IBM i is affected by CVE-2021-25219

Security Bulletin


Summary

The IBM i DNS Server implementation uses ISC BIND. IBM i has addressed the applicable CVE with a fix.

Vulnerability Details

CVEID:   CVE-2021-25219
DESCRIPTION:   ISC BIND is vulnerable to a denial of service, caused by a flaw in response processing. By abusing a lame cache, an attacker could exploit this vulnerability to cause a named resolver to spend most of its CPU time on managing and checking the lame cache and severely degrade resolver performance.
CVSS Base score: 5.3
CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/212375 for the current score.
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L)

Affected Products and Versions

Affected Product(s)Version(s)
IBM i7.4
IBM i7.3
IBM i7.2
IBM i7.1

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 are:
Release 7.4 – SI77560
Release 7.3 – SI77753
Release 7.2 – SI77898
Release 7.1 – SI77757

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

Off

Related Information

IBM Secure Engineering Web Portal
IBM Product Security Incident Response Blog

Change History

22 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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Document Information

Modified date:
22 December 2021

Initial Publish date:
22 December 2021

UID

ibm16536716

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