CVE-2022-4767 in memos
Summary
by MITRE • 12/27/2022
Denial of Service in GitHub repository usememos/memos prior to 0.9.1.
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Analysis
by VulDB Data Team • 01/25/2023
The vulnerability identified as CVE-2022-4767 represents a denial of service condition affecting the usememos/memos repository prior to version 0.9.1. This issue specifically targets the application's handling of certain input parameters that can trigger uncontrolled resource consumption, ultimately leading to system instability and service disruption. The vulnerability stems from inadequate input validation mechanisms within the application's processing pipeline, where malformed or specially crafted requests can cause the system to enter an infinite loop or consume excessive computational resources.
This vulnerability operates at the application layer and can be classified under CWE-400, which encompasses issues related to resource exhaustion and uncontrolled resource consumption. The flaw manifests when the application processes user-provided data without proper sanitization or validation checks, allowing malicious actors to exploit the system's resource management capabilities. The affected system becomes unable to process legitimate requests effectively, resulting in a denial of service condition that impacts availability for authorized users and potentially disrupts business operations.
The operational impact of this vulnerability extends beyond simple service interruption, as it can affect the overall reliability and performance of the memos application. Attackers can leverage this weakness to consume CPU cycles, memory resources, or other system components, potentially causing cascading failures throughout the application stack. The vulnerability affects the application's ability to maintain consistent response times and can lead to complete service unavailability, particularly when multiple concurrent requests are made to exploit the flaw.
Mitigation strategies for CVE-2022-4767 involve implementing robust input validation controls and rate limiting mechanisms to prevent resource exhaustion attacks. Organizations should upgrade to version 0.9.1 or later, which includes patches addressing the specific resource consumption issues. Network-level protections such as intrusion detection systems and web application firewalls can help detect and block malicious requests before they reach the vulnerable application components. Additionally, implementing proper monitoring and alerting for unusual resource consumption patterns can aid in early detection of exploitation attempts.
The vulnerability aligns with several ATT&CK techniques including T1499.004 for network denial of service and T1595.001 for reconnaissance using network sniffers. Security teams should consider this vulnerability as part of their broader threat modeling efforts, particularly when evaluating the attack surface of open source applications deployed in production environments. The issue demonstrates the critical importance of maintaining up-to-date software versions and implementing proper security controls to prevent resource exhaustion attacks that can severely impact system availability and user experience.