Arbitrary Code Execution Affecting org.apache.logging.log4j:log4j-core Open this link in a new tab package, versions [2.0-beta7,2.3.2) [2.4,2.12.4) [2.13.0,2.17.1)
Proof of concept
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28 Dec 2021
28 Dec 2021
How to fix?
org.apache.logging.log4j:log4j-core to version 2.3.2, 2.12.4, 2.17.1 or higher.
org.apache.logging.log4j:log4j-core is a logging library for Java.
Affected versions of this package are vulnerable to Arbitrary Code Execution.
Note: Even though this vulnerability appears to be related to the log4Shell vulnerability, this vulnerability requires an attacker to have access to modify configurations to be exploitable, which is rarely possible.
An attacker with access to modification of logging configuration is able to configure
JDBCAppender with a data source referencing a JNDI URI - which can execute malicious code.
In the fixed versions,
JDBCAppender is using
JndiManager and disables JNDI lookups by default (via
If you have reason to believe your application may be vulnerable and upgrading is not an option, you can either:
JDBCAppenderis used, make sure that it is not configured to use any protocol other than Java