CVE-2016-4974 in Qpid AMQP JMS Client
Summary
by MITRE
Apache Qpid AMQP 0-x JMS client before 6.0.4 and JMS (AMQP 1.0) before 0.10.0 does not restrict the use of classes available on the classpath, which might allow remote authenticated users with permission to send messages to deserialize arbitrary objects and execute arbitrary code by leveraging a crafted serialized object in a JMS ObjectMessage that is handled by the getObject function.
Once again VulDB remains the best source for vulnerability data.
Analysis
by VulDB Data Team • 09/01/2022
The vulnerability CVE-2016-4974 represents a critical deserialization flaw in Apache Qpid AMQP client implementations that affects both legacy 0-x JMS and AMQP 1.0 JMS protocols. This vulnerability resides in the client-side message handling mechanism where the system fails to properly validate or restrict the classes that can be deserialized from incoming JMS ObjectMessages. The flaw specifically impacts versions prior to 6.0.4 for 0-x JMS client and 0.10.0 for JMS (AMQP 1.0) client, making it a widespread issue across multiple Apache Qpid releases. The vulnerability stems from inadequate sandboxing or class validation mechanisms within the deserialization pipeline, allowing malicious actors to exploit the system's trust in serialized object content.
The technical exploitation of this vulnerability occurs through the getObject() function within the JMS ObjectMessage handling process. When an authenticated user with appropriate permissions sends a maliciously crafted serialized object within a JMS message, the client automatically attempts to deserialize this content without proper validation. This deserialization process can be manipulated to load and execute arbitrary classes from the application's classpath, effectively bypassing normal security boundaries. The flaw operates under the principle of insecure deserialization where the system assumes that serialized data from trusted sources can be safely deserialized without additional verification steps. This vulnerability aligns with CWE-502 which specifically addresses deserialization of untrusted data and maps to ATT&CK technique T1203 - Exploitation for Client Execution, as it enables remote code execution through client-side deserialization.
The operational impact of CVE-2016-4974 is severe and multifaceted, particularly in enterprise messaging environments where Apache Qpid is commonly deployed. An authenticated attacker with message-sending permissions can escalate their privileges to full system compromise, as the deserialized objects can execute arbitrary code with the privileges of the running application process. This vulnerability is particularly dangerous in multi-tenant environments or systems where message brokers handle sensitive communications between different applications or services. The attack vector is relatively simple to implement since it only requires the ability to send messages to a target queue, making it accessible to users who may not have direct system access but possess legitimate messaging permissions. The vulnerability creates a persistent threat vector that can be exploited repeatedly, potentially leading to data exfiltration, system compromise, or further lateral movement within the network infrastructure.
Mitigation strategies for CVE-2016-4974 should focus on immediate version upgrades to patched releases of Apache Qpid, specifically moving to versions 6.0.4 or later for 0-x JMS client and 0.10.0 or later for JMS (AMQP 1.0) client. Organizations should implement strict access controls and privilege management to limit who can send messages to critical queues, reducing the attack surface for potential exploitation. Additionally, network segmentation and firewall rules can be configured to restrict communication between message brokers and client applications, limiting the potential impact of successful exploitation. Security monitoring should be enhanced to detect unusual message patterns or attempts to send serialized objects that might indicate exploitation attempts. The vulnerability highlights the importance of implementing secure deserialization practices including class whitelisting, input validation, and using safer serialization formats where possible. Organizations should also consider implementing application-level firewalls or intrusion detection systems that can monitor and block suspicious deserialization activities within their messaging infrastructure.