Security Bulletin: Multiple Vulnerabilities in Apache Log4j impact IBM Sterling External Authentication Server (CVE-2021-45105, CVE-2021-45046)

Summary

IBM Sterling External Authentication Server is vulnerable to denial of service and arbitrary code execution due to Apache Log4j, which is used for logging (CVE-2021-45105,CVE-2021-45046). The fix includes Apache Log4j 2.17.0.

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 strongly recommends addressing the vulnerability now.

See the Fix Central links below for Apache Log4j 2.17.0 jar files and installation instructions for an immediate remediation of the vulnerabilities prior to full iFixes for the associated releases.

The Fix Central - 6030 link points to a fix called SSP-SEAS-log4j-2.17.0-jars-for-CVE-2021-45105 which supplies the jars and instructions to replace them. This fix remediates CVE-2021-44228, CVE-2021-45046, and CVE-2021-45105.

Workarounds and Mitigations

None