Security Bulletin: Vulnerability in Apache Log4j affects IBM Event Streams (CVE-2021-45105, CVE-2021-45046)

Summary

There is a vulnerability in the Apache Log4j open source library. The library is used by IBM Event Streams.

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)

CVEID:CVE-2021-45046
**DESCRIPTION:**Apache Log4j could result in remote code execution, caused by an incomplete fix of CVE-2021-44228 in certain non-default configurations. When the logging configuration uses a non-default Pattern Layout with a Context Lookup, an attacker with control over Thread Context Map (MDC) input data can craft malicious input data using a JNDI Lookup pattern to leak sensitive information and remote code execution in some environments and local code execution in all environments.
CVSS Base score: 9
CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/215195 for the current score.
CVSS Vector: (CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H)

Affected Products and Versions

Remediation/Fixes

IBM Event Streams (Helm-based releases)

• Download the 2019.4.6 release from IBM Fix Central.
• Upgrade to IBM Event Streams 2019.4.6 by following the upgrading and migrating documentation.

IBM Event Streams (Continuous Delivery)

• Upgrade to IBM Event Streams 10.5.0 by following the upgrading and migrating documentation.

IBM Event Streams (Extended Update Support)

• Upgrade to IBM Event Streams 10.2.1 by following the upgrading and migrating documentation.

Workarounds and Mitigations

None