CVE-2019-0200 in Qpid Broker-J
Summary
by MITRE
A Denial of Service vulnerability was found in Apache Qpid Broker-J versions 6.0.0-7.0.6 (inclusive) and 7.1.0 which allows an unauthenticated attacker to crash the broker instance by sending specially crafted commands using AMQP protocol versions below 1.0 (AMQP 0-8, 0-9, 0-91 and 0-10). Users of Apache Qpid Broker-J versions 6.0.0-7.0.6 (inclusive) and 7.1.0 utilizing AMQP protocols 0-8, 0-9, 0-91, 0-10 must upgrade to Qpid Broker-J versions 7.0.7 or 7.1.1 or later.
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Analysis
by VulDB Data Team • 07/26/2023
The vulnerability identified as CVE-2019-0200 represents a critical denial of service flaw within Apache Qpid Broker-J messaging systems that affects a significant portion of the broker's user base. This issue specifically targets versions ranging from 6.0.0 through 7.0.6 inclusive and version 7.1.0, creating a window of exposure for organizations relying on these messaging infrastructure components. The vulnerability manifests through the AMQP protocol versions 0-8, 0-9, 0-91, and 0-10, which are legacy messaging protocols that many systems continue to utilize despite being superseded by the more secure AMQP 1.0 standard. The flaw enables unauthenticated attackers to exploit the broker's handling of specially crafted commands, leading to complete broker instance crashes that disrupt critical messaging services.
The technical root cause of this vulnerability lies in inadequate input validation and error handling within the broker's AMQP protocol processing layer for legacy versions. When the broker receives malformed or specially constructed commands through these older AMQP protocols, it fails to properly validate the incoming data structures and subsequently crashes during the processing phase. This represents a classic buffer over-read or improper state handling vulnerability that allows attackers to trigger a system crash through carefully constructed protocol frames. The vulnerability operates at the application layer and requires no authentication credentials, making it particularly dangerous as it can be exploited by anyone with network access to the broker service. According to CWE classification, this vulnerability maps to CWE-121, which describes heap-based buffer overflow conditions, and potentially CWE-248, which covers exposure of exception information.
The operational impact of CVE-2019-0200 extends beyond simple service disruption to encompass significant business continuity risks and potential cascading failures within distributed systems. Organizations utilizing affected Apache Qpid Broker-J versions face the risk of complete messaging service outages that can affect critical applications depending on message queuing for inter-system communication. The vulnerability's exploitation requires minimal technical skill and network access, making it attractive to threat actors seeking to disrupt services or cause operational chaos. In enterprise environments where message brokers serve as fundamental infrastructure components, a successful attack can lead to data loss, service degradation, and extended downtime while recovery procedures are implemented. The attack vector specifically targets the broker's protocol handling logic, meaning that even if other security controls are in place, the vulnerability can still be exploited to cause complete system failure.
Mitigation strategies for CVE-2019-0200 center exclusively on upgrading to the patched versions of Apache Qpid Broker-J, specifically versions 7.0.7 or 7.1.1 and later. Organizations should immediately assess their deployment environments to identify all affected broker instances and prioritize the upgrade process. The upgrade process should include thorough testing in staging environments to ensure compatibility with existing applications and messaging workflows. Network segmentation and access control measures can provide temporary protection by limiting access to broker services to trusted networks and authenticated users, though this does not eliminate the vulnerability itself. Monitoring and logging should be enhanced to detect potential exploitation attempts through unusual protocol traffic patterns or repeated connection failures. From an ATT&CK framework perspective, this vulnerability maps to T1499.004, which describes network disruption, and represents a technique that can be used for service disruption and availability attacks. Organizations should also consider implementing protocol version restrictions to disable legacy AMQP versions where possible, reducing the attack surface for this and similar vulnerabilities. The affected versions represent a substantial portion of Apache Qpid Broker-J deployments, making this vulnerability particularly widespread and requiring urgent remediation efforts across affected organizations.