CVE-2022-23307 Overview
CVE-2022-23307 is an insecure deserialization vulnerability affecting Apache Chainsaw and Apache Log4j 1.2.x. This vulnerability was originally identified as CVE-2020-9493, which discovered a deserialization issue present in Apache Chainsaw. Prior to Chainsaw V2.0, Chainsaw was a component of Apache Log4j 1.2.x, where the same deserialization vulnerability exists. This flaw allows authenticated attackers with network access to potentially achieve remote code execution by exploiting unsafe deserialization of untrusted data.
Critical Impact
Authenticated attackers can exploit this deserialization vulnerability to execute arbitrary code on affected systems running Apache Chainsaw or Log4j 1.2.x, potentially leading to complete system compromise.
Affected Products
- Apache Chainsaw (versions prior to V2.0)
- Apache Log4j 1.2.x
- QOS reload4j
- Oracle WebLogic Server (12.2.1.3.0, 12.2.1.4.0, 14.1.1.0.0)
- Oracle Business Intelligence (5.9.0.0.0, 12.2.1.3.0, 12.2.1.4.0)
- Oracle Communications Messaging Server 8.1
- Oracle Enterprise Manager Base Platform (13.4.0.0, 13.5.0.0)
- Oracle MySQL Enterprise Monitor
- Oracle Identity Management Suite (12.2.1.3.0, 12.2.1.4.0)
Discovery Timeline
- 2022-01-18 - CVE-2022-23307 published to NVD
- 2024-11-21 - Last updated in NVD database
Technical Details for CVE-2022-23307
Vulnerability Analysis
This vulnerability (CWE-502: Deserialization of Untrusted Data) stems from improper handling of serialized objects within Apache Chainsaw and Log4j 1.2.x components. When an application deserializes data from untrusted sources without proper validation, attackers can craft malicious serialized objects that, when deserialized, execute arbitrary code or perform other unauthorized actions.
The deserialization vulnerability is particularly dangerous in Java environments because the Java serialization mechanism can instantiate objects and execute code during the deserialization process. Attackers can leverage known "gadget chains" present in the application's classpath to achieve remote code execution.
Root Cause
The root cause lies in the unsafe deserialization practices within Apache Chainsaw and Log4j 1.2.x. These components accept serialized Java objects from potentially untrusted sources without implementing proper validation or filtering of the object types being deserialized. When malicious serialized data is processed, the Java Virtual Machine executes code embedded within the crafted payload, bypassing normal security controls.
Log4j 1.2.x includes Chainsaw as an integrated component, which means any application using Log4j 1.x inherits this vulnerability. The legacy nature of Log4j 1.x compounds the risk, as this version reached end-of-life in August 2015 and no longer receives security updates from Apache.
Attack Vector
The attack is network-based and requires the attacker to have low-privilege authenticated access to the target system. The attacker crafts a malicious serialized Java object containing a "gadget chain" that exploits classes available in the application's classpath.
The exploitation process involves:
- Identifying an endpoint or functionality that processes serialized Java objects
- Crafting a malicious serialized payload using available gadget chains (such as those from Apache Commons Collections or other libraries)
- Sending the payload to the vulnerable component via network communication
- The vulnerable deserialization mechanism processes the payload, triggering code execution
No user interaction is required for exploitation. Upon successful attack, the adversary gains the ability to execute arbitrary commands with the privileges of the application process, potentially leading to full system compromise, data exfiltration, or lateral movement within the network.
Detection Methods for CVE-2022-23307
Indicators of Compromise
- Presence of Apache Log4j 1.2.x JAR files (log4j-1.2.*.jar) in application deployments
- Unusual serialized Java object traffic on network ports used by affected applications
- Unexpected process spawning from Java application processes
- Presence of known deserialization gadget chain artifacts in memory or logs
Detection Strategies
- Implement application-layer monitoring to detect serialized Java object patterns in network traffic
- Deploy endpoint detection rules to identify exploitation of known gadget chains (Commons Collections, Spring, etc.)
- Monitor for suspicious Java process behavior including unexpected child processes or network connections
- Scan all applications and dependencies for Log4j 1.2.x and Chainsaw components using software composition analysis tools
Monitoring Recommendations
- Enable verbose logging for Java applications to capture deserialization events
- Configure network intrusion detection systems to alert on serialized Java object signatures
- Implement file integrity monitoring on application directories to detect unauthorized JAR modifications
- Establish baseline process behavior for Java applications and alert on deviations
How to Mitigate CVE-2022-23307
Immediate Actions Required
- Identify all applications using Apache Log4j 1.2.x or Apache Chainsaw and prioritize remediation
- Upgrade Apache Chainsaw to version 2.0 or later, which addresses this vulnerability
- Migrate from Apache Log4j 1.x to Log4j 2.x (version 2.17.1 or later) as Log4j 1.x is end-of-life
- Consider using QOS reload4j as a drop-in replacement for Log4j 1.x with security fixes applied
- Apply Oracle Critical Patch Updates if running affected Oracle products
Patch Information
Apache has addressed this vulnerability in Chainsaw V2.0, which separates Chainsaw from Log4j and includes deserialization safeguards. For organizations unable to upgrade immediately, migrating to Log4j 2.x or the QOS reload4j project provides a maintained alternative.
Oracle has released patches through their Critical Patch Updates in April 2022 and July 2022 to address this vulnerability in affected Oracle products. Refer to the Oracle CPU April 2022 Alert and Oracle CPU July 2022 Alert for specific version updates. Additional details are available in the Apache Mailing List Thread and Apache Log4j Documentation.
Workarounds
- Remove Chainsaw components from Log4j 1.x deployments if the log viewer functionality is not required
- Implement network segmentation to limit access to services that process serialized objects
- Deploy web application firewalls with rules to block serialized Java object payloads
- Use Java deserialization filters (JEP 290) to restrict classes that can be deserialized, if running Java 9+ or backported versions
# Example: Identifying Log4j 1.x instances on Linux systems
find / -name "log4j-1.2*.jar" -type f 2>/dev/null
# Example: Java deserialization filter (Java 9+)
# Add to JVM arguments to restrict deserialization
-Djdk.serialFilter=!org.apache.commons.collections.**;!org.apache.commons.collections4.**
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
