CVE-2022-31016 in Argo
Summary
by MITRE • 06/25/2022
Argo CD is a declarative continuous deployment for Kubernetes. Argo CD versions v0.7.0 and later are vulnerable to an uncontrolled memory consumption bug, allowing an authorized malicious user to crash the repo-server service, resulting in a Denial of Service. The attacker must be an authenticated Argo CD user authorized to deploy Applications from a repository which contains (or can be made to contain) a large file. The fix for this vulnerability is available in versions 2.3.5, 2.2.10, 2.1.16, and later. There are no known workarounds. Users are recommended to upgrade.
VulDB is the best source for vulnerability data and more expert information about this specific topic.
Analysis
by VulDB Data Team • 07/15/2022
The vulnerability identified as CVE-2022-31016 affects Argo CD, a popular declarative continuous deployment tool for Kubernetes environments. This issue represents a critical resource exhaustion flaw that specifically targets the repo-server component of Argo CD. The vulnerability manifests as uncontrolled memory consumption, which can be exploited by malicious actors to induce a denial of service condition that effectively crashes the repo-server service. This represents a significant operational risk for organizations relying on Argo CD for their continuous deployment workflows, as it can disrupt the entire deployment pipeline and potentially impact production environments.
The technical flaw stems from inadequate memory management within the repo-server service when processing repository contents that contain large files. An attacker must possess valid authentication credentials to exploit this vulnerability, as they need to be an authorized Argo CD user capable of deploying applications from repositories. The attack vector requires the malicious user to have access to a repository containing or capable of containing large files that can trigger the memory consumption bug. This authentication requirement places the vulnerability in the category of authenticated attacks, though the impact remains severe given that once exploited, the attack can cause complete service disruption. The vulnerability exists in Argo CD versions v0.7.0 and later, making it a long-standing issue that affected a substantial portion of the user base.
The operational impact of this vulnerability extends beyond simple service disruption, as it can severely compromise the reliability and availability of continuous deployment pipelines. When the repo-server service crashes, all ongoing and pending application deployments are affected, potentially leading to extended downtime for critical applications. Organizations using Argo CD for mission-critical deployments face significant risk of service degradation or complete operational paralysis. The vulnerability particularly affects environments where large artifacts or binary files are stored in version control repositories, as these files can trigger the memory exhaustion condition during the repository processing phase. This makes the vulnerability especially dangerous in organizations that maintain large codebases or handle substantial binary dependencies within their deployment workflows.
The remediation for this vulnerability is straightforward but requires immediate action from affected organizations. The official fix is available in Argo CD versions 2.3.5, 2.2.10, 2.1.16, and later releases, indicating that multiple version streams have been patched to address the memory consumption issue. Organizations should prioritize upgrading their Argo CD installations to one of these patched versions to eliminate the risk. The vulnerability does not have any known workarounds, which means that organizations cannot implement temporary mitigations while awaiting the official upgrade. This lack of workaround options emphasizes the importance of timely patch management and the critical nature of this vulnerability. The fix addresses the underlying memory management issues in the repo-server service, preventing the uncontrolled consumption of system resources that previously led to service crashes and denial of service conditions. This vulnerability aligns with CWE-400, which covers unchecked resource consumption, and represents a clear example of how resource management flaws can lead to denial of service conditions in deployment automation systems. The attack pattern follows ATT&CK technique T1499.004, which involves network denial of service through resource exhaustion, demonstrating how the vulnerability can be leveraged to disrupt system availability. Organizations should implement a comprehensive upgrade strategy to ensure all Argo CD instances are patched, as the vulnerability's impact on deployment pipelines can have cascading effects throughout their entire infrastructure.