Security Bulletin: A vulnerability in Apache Log4j affects IBM Db2 Web Query for i (CVE-2021-45105)

Security Bulletin

Summary

There is a vulnerability in Apache Log4j as described in the vulnerability details section. Apache Log4j v2.16 is used by Db2 Web Query for i for generating logs and diagnostic traces in some of its components. IBM has addressed the vulnerability in Db2 Web Query for i.

Vulnerability Details

CVEID: CVE-2021-45105
DESCRIPTION: Apache Log4j is vulnerable to a denial of service, caused by the failure to protect from uncontrolled recursion from self-referential lookups. A remote attacker with control over Thread Context Map (MDC) input data could craft malicious input data that contains a recursive lookup to cause a StackOverflowError that will terminate the process. Note: The vulnerability is also called LOG4J2-3230.
CVSS Base score: 7.5
CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/215647 for the current score.
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)

Affected Products and Versions

Affected Product(s)	Version(s)
IBM Db2 Web Query for i	2.3.0
IBM Db2 Web Query for i	2.2.1

Remediation/Fixes

It is strongly recommended that you apply the fix.

The issue can be fixed by applying a Group Program Temporary Fix (PTF) for Db2 Web Query for i.
Db2 Web Query for i releases 2.3.0 and 2.2.1 are impacted and will be fixed.
The Db2 Web Query for i group PTF contains the fix for the CVE by upgrading to Apache Log4j v2.17. The group PTF numbers for each IBM i release and minimum group levels that contain the fix are:

IBM Db2 Web Query	IBM i 7.4	IBM i 7.3	IBM i 7.2	IBM i 7.1
2.3.0	SF99654 Level 4	SF99533 Level 4	N/A	N/A
2.2.1	SF99653 Level 12	SF99433 Level 12	SF99434 Level 12	SF99435 Level 12

Group Program Temporary Fixes (PTFs) can be downloaded from 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

28 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: A vulnerability in Apache Log4j affects IBM Db2 Web Query for i (CVE-2021-45105)