CVE-2016-3094 in Qbid Java
Summary
by MITRE
PlainSaslServer.java in Apache Qpid Java before 6.0.3, when the broker is configured to allow plaintext passwords, allows remote attackers to cause a denial of service (broker termination) via a crafted authentication attempt, which triggers an uncaught exception.
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Analysis
by VulDB Data Team • 08/22/2022
The vulnerability described in CVE-2016-3094 represents a critical denial of service flaw within Apache Qpid Java broker implementations. This issue specifically affects versions prior to 6.0.3 and stems from improper exception handling within the PlainSaslServer.java component. The vulnerability manifests when the broker is configured to accept plaintext password authentication, creating a scenario where malicious actors can exploit a crafted authentication attempt to trigger an uncaught exception that ultimately terminates the broker service.
The technical root cause of this vulnerability lies in the inadequate error handling mechanisms within the SASL authentication process. When a specially crafted authentication request is submitted to the broker, the PlainSaslServer component fails to properly manage the exception flow, resulting in an unhandled exception that cascades through the system architecture. This particular flaw falls under the category of improper exception handling as classified by CWE-252, which specifically addresses situations where exceptions are not properly caught or managed, leading to application instability or termination. The vulnerability demonstrates a classic example of how insufficient input validation and exception management can create exploitable conditions in authentication systems.
The operational impact of this vulnerability extends beyond simple service disruption to potentially compromise the entire messaging infrastructure. When exploited, the denial of service condition causes the broker to terminate unexpectedly, which can result in message queue failures, communication breakdowns between applications, and potential data loss. This type of attack directly violates the availability principle of the CIA triad and can have cascading effects throughout distributed systems that depend on the Qpid broker for message passing. The vulnerability is particularly concerning because it requires minimal privileges to exploit, as attackers only need to initiate a malicious authentication attempt rather than possessing elevated system access rights.
Organizations utilizing Apache Qpid Java brokers must implement immediate mitigation strategies to address this vulnerability. The primary and most effective remediation involves upgrading to Apache Qpid Java version 6.0.3 or later, which contains the necessary exception handling fixes. Additionally, system administrators should consider implementing network-level controls to restrict access to the broker's authentication endpoints and monitor for unusual authentication patterns that might indicate exploitation attempts. From an ATT&CK framework perspective, this vulnerability maps to the T1499.004 technique related to network denial of service, and organizations should implement defensive measures such as rate limiting and connection monitoring to detect and prevent exploitation attempts. Security teams should also consider implementing intrusion detection systems that can identify malicious authentication patterns and ensure proper logging and monitoring of authentication attempts to facilitate incident response activities.