Third Log4J Bug Can Trigger DoS; Apache Issues Patch

The new Log4j vulnerability is similar to Log4Shell in that it also affects the logging library, but this DoS flaw has to do with Context Map lookups, not JNDI.

No, you’re not seeing triple: On Friday, Apache released yet another patch – version 2.17 – for yet another flaw in the ubiquitous log4j logging library, this time for a DoS bug.

Trouble comes in threes, and this is the third one for log4j. The latest bug isn’t a variant of the Log4Shell remote-code execution (RCE) bug that’s plagued IT teams since Dec. 10, coming under active attack worldwide within hours of its public disclosure, spawning even nastier mutations and leading to the potential for denial-of-service (DoS) in Apache’s initial patch.

It does have similarities, though: The new bug affects the same component as the Log4Shell bug. Both the Log4Shell, tracked as CVE-2021-44228 (criticality rating of CVSS 10.0) and the new bug, tracked as CVE-2021-45105 (CVSS score: 7.5) abuse attacker-controlled lookups in logged data.

The difference: The lookups in the new bug, CVE-2021-45105, are Context Map lookups instead of the Java Naming and Directory Interface (JNDI) lookups to an LDAP server that allow attackers to execute

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