![]() Several exploit techniques exist that leverage specific Java code paths/classes to achieve remote code execution (RCE). If log4j is configured with non-default Pattern Layout with a Context Lookup such as $ and lookup and return Java code from a remote attacker controlled server. Other projects like Log4net are not impacted. ![]() Applications using only the log4j-api JAR file without the log4j-core JAR file are not impacted.Īpache Log4j is the only Logging Services subproject affected by this vulnerability. Only the log4j-core JAR file is impacted by this vulnerability. Successful attacks require the attacker to have access to Thread Context Map (MDC) input, and for log4j configured with non-default pattern layout with a Context Lookup. An attacker can trigger a DoS with malicious input data that generates a recursive lookup and consequent application crash. This has been fixed by using the JndiManager in the createConnectionSource method in DataSourceConnectionSource.java when performing lookups using a JDNI data source.Īpache log4j is vulnerable to a denial-of-service (DoS) when uncontrolled recursion occurs through a self-referencing lookup. An attacker that is able to modify the configuration files to contain a jdbcAppender that has a JDNI URI in the data source can use this to achieve RCE. The createConnectionSource method in log4j-core/src/main/java/org/apache/logging/log4j/core/appender/db/jdbc/DataSourceConnectionSource.java performs a lookup with the given jndiName. The RCE vulnerability is due to the JDBC Appender not using the JndiManager when accessing JNDI resources. Note: This vulnerability impacts log4j-core. This allows an attacker that has permissions to modify the logging configuration files to input a malicious JDBC Appender with a data source referencing a JDNI URI. ![]() Log4j vulnerable to Remote Code Execution (RCE) via Malicious JDBC Appender ConfigurationĪpache Log4j vulnerable to denial-of-service (DoS) via infinite loopĪpache Log4j vulnerable to Remote Code Execution (RCE) via non-default pattern layoutĪpache Log4j vulnerable to Remote Code Execution (RCE) through LDAP access via JNDI and specially crafted log messagesĪpache Log4j contains a remote code execution (RCE) vulnerability. Summary of the recent Log4j vulnerabilities CVE ID This will simplify the triage, validation, and remediation efforts. This information enables users to quickly identify where they have exposure to this vulnerability without requiring any rescanning of their applications. ![]() ![]() The Synopsys Cybersecurity Research Center (CyRC) has issued a corresponding set of Black Duck® Security Advisory (BDSA) records, and assigned a CVSS score with links to proof-of-concept exploits. As Log4j is a de facto standard within the Java community, it’s likely that most Java applications use it as their log interface. The Synopsys Cybersecurity Research Center (CyRC) has issued a corresponding Black Duck® Security Advisory (BDSA), and assigned a CVSS score of 9.4, with links to proof-of-concept exploits.Ĭlick the video above for an analysis of the Log4j vulnerability.Ī dangerous, zero day exploit has been identified in Log4j, a popular Java logging library.Īpache Log4j/Log4j2 is broadly used within the Java community to implement application logging. ![]()
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