Security Bulletin: Apache Log4j vulnerabilities impact z/Transaction Processing Facility (z/TPF) and TPF Operations Server (CVE-2021-45105, CVE-2021-45046)

Summary

The Apache Log4j vulnerabilities affect the z/Transaction Processing Facility (z/TPF) system and TPF Operations Server. Several Java applications on the z/TPF system depend on Apache Log4j capabilities. Additionally, the 64-bit Java support in TPF Operations Server uses Apache Log4j capabilities. All components in the z/TPF system and TPF Operations Server that use Apache Log4j have been updated to use Apache Log4j 2.17.1.

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

z/Transaction Processing Facility ( z/TPF)

| 1.1
TPF Operations Server| 1.2.06

Remediation/Fixes

IBM strongly recommends addressing the vulnerability now.

Apply the APAR, which is available for download from the TPF Family Products: Maintenance for z/TPF & z/TPFDF web page.

TPF Operations Server| 1.2.06| IT39522|

Apply the APAR, which is available for download from the TPF Product Family: Maintenance for TPF Operations Server web page.

Workarounds and Mitigations

None.