In Log4j 2.12.2 (for Java 7) and 2.16.0 (for Java 8 or later) the message lookups feature has been completely removed. ImpactĪ remote, unauthenticated attacker with the ability to log specially crafted messages can cause Log4j to connect to a service controlled by the attacker to download and execute arbitrary code. Applications using only the log4j-api JAR file without the log4j-core JAR file are not impacted by this vulnerability. Note that only the log4j-core JAR file is impacted by this vulnerability. Log4j 1.x configurations without JMSAppender are not impacted by this vulnerability. To mitigate: audit your logging configuration to ensure it has no JMSAppender configured. A separate CVE (CVE-2021-4104) has been filed for this vulnerability. Applications using Log4j 1.x are only vulnerable to this attack when they use JNDI in their configuration. Log4j 1.x mitigation: Log4j 1.x does not have Lookups so the risk is lower. More information is available from the Apache Log4j Security Vulnerabilities page, including these highlights.Ĭertain conditions must be met to make Log4j 1.x vulnerable: We provide tools to scan for vulnerable jar files. This vulnerability poses considerabily more risk than the others.ĬVE-2021-4104 tracks a very similar vulnerability that affects Log4j 1 if JMSAppender and malicious connections have been configured.ĬVE-2021-45046 tracks an incomplete fix for CVE-2021-44228 affecting Log4j 2.15.0 when an attacker has ".control over Thread Context Map (MDC) input data when the logging configuration uses a non-default Pattern Layout with either a Context Lookup (for example, $$) or a Thread Context Map pattern." This vulnerability note includes information about the following related vulnerabilities.ĬVE-2021-44228 tracks the initial JNDI injection and RCE vulnerability in Log4j 2. The default configuration of Apache Log4j supports JNDI (Java Naming and Directory Interface) lookups that can be exploited to exfiltrate data or execute arbitrary code via remote services such as LDAP, RMI, and DNS. Apache Log4j allows insecure JNDI lookups that could allow an unauthenticated, remote attacker to execute arbitrary code with the privileges of the vulnerable Java application using Log4j.ĬISA has published Apache Log4j Vulnerability Guidance and provides a Software List.
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