CVE-2012-4458 in Qpid
Summary
by MITRE
The AMQP type decoder in Apache Qpid 0.20 and earlier allows remote attackers to cause a denial of service (memory consumption and server crash) via a large number of zero width elements in the client-properties map in a connection.start-ok message.
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Analysis
by VulDB Data Team • 12/30/2021
The vulnerability identified as CVE-2012-4458 represents a critical denial of service weakness in Apache Qpid messaging systems version 0.20 and earlier. This flaw specifically targets the Advanced Message Queuing Protocol AMQP type decoder component which processes connection establishment messages from clients. The vulnerability manifests when a malicious client sends a connection.start-ok message containing an excessive number of zero width elements within the client-properties map structure. This particular attack vector exploits the lack of proper input validation and bounds checking in the AMQP decoder implementation, allowing an attacker to consume excessive memory resources and ultimately cause the target server to crash.
The technical exploitation of this vulnerability occurs during the AMQP connection handshake process when the server attempts to decode the client-properties map contained in the connection.start-ok message. The AMQP type decoder in affected versions fails to properly validate the size and structure of elements within this map, particularly when encountering zero width elements that require special handling. These zero width elements, while technically valid in the AMQP specification, when repeated in large quantities can cause the decoder to allocate excessive memory buffers or enter infinite loops during parsing operations. The vulnerability falls under CWE-129 Input Validation and Output Encoding, specifically targeting improper validation of array indices and buffer overflows in protocol parsing components. This weakness enables attackers to perform resource exhaustion attacks that consume all available memory on the target server, leading to complete service disruption.
The operational impact of CVE-2012-4458 extends beyond simple service interruption to potentially compromise the entire messaging infrastructure. When exploited successfully, the vulnerability allows remote attackers to consume system resources at an exponential rate, causing the Qpid server to become unresponsive and eventually crash. This denial of service condition affects all services relying on the vulnerable messaging system, potentially disrupting critical business operations that depend on message queuing for inter-application communication. The vulnerability is particularly dangerous in enterprise environments where Qpid servers may be exposed to untrusted networks or clients, as it requires no authentication to exploit and can be executed from any remote location. The attack can be amplified by sending multiple connection.start-ok messages with varying numbers of zero width elements, making it difficult to detect and mitigate through simple rate limiting approaches.
Mitigation strategies for CVE-2012-4458 should focus on immediate software upgrades to Apache Qpid versions 0.22 or later, where the vulnerability has been addressed through improved input validation and bounds checking in the AMQP type decoder. Organizations should implement network segmentation to restrict access to Qpid servers and deploy firewalls that can detect and block malformed connection.start-ok messages containing suspicious element counts. Additionally, monitoring systems should be configured to track memory usage patterns and connection attempts that exceed normal operational parameters, providing early warning of potential exploitation attempts. The vulnerability demonstrates the importance of implementing proper input validation and defensive programming practices in protocol implementations, aligning with ATT&CK technique T1499.004 for Resource Exhaustion and T1071.004 for Application Layer Protocol. Organizations should also consider implementing rate limiting and connection pooling mechanisms to reduce the impact of potential exploitation attempts while maintaining legitimate service availability.