CVE-2022-24768 in Argo
Summary
by MITRE • 03/24/2022
Argo CD is a declarative, GitOps continuous delivery tool for Kubernetes. All unpatched versions of Argo CD starting with 1.0.0 are vulnerable to an improper access control bug, allowing a malicious user to potentially escalate their privileges to admin-level. Versions starting with 0.8.0 and 0.5.0 contain limited versions of this issue. To perform exploits, an authorized Argo CD user must have push access to an Application's source git or Helm repository or `sync` and `override` access to an Application. Once a user has that access, different exploitation levels are possible depending on their other RBAC privileges. A patch for this vulnerability has been released in Argo CD versions 2.3.2, 2.2.8, and 2.1.14. Some mitigation measures are available but do not serve as a substitute for upgrading. To avoid privilege escalation, limit who has push access to Application source repositories or `sync` + `override` access to Applications; and limit which repositories are available in projects where users have `update` access to Applications. To avoid unauthorized resource inspection/tampering, limit who has `delete`, `get`, or `action` access to Applications.
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Analysis
by VulDB Data Team • 03/25/2022
The vulnerability identified as CVE-2022-24768 represents a critical improper access control flaw within Argo CD, a widely adopted GitOps continuous delivery tool for Kubernetes environments. This vulnerability affects all unpatched versions of Argo CD beginning with version 1.0.0, creating a significant security risk that could allow malicious users to escalate their privileges to administrative levels. The flaw specifically targets the authorization mechanisms within Argo CD's role-based access control (RBAC) system, potentially enabling unauthorized privilege escalation through carefully crafted exploitation techniques. The vulnerability manifests when users possess specific access rights to application source repositories or application management capabilities, making it particularly dangerous in environments where multiple users have varying degrees of access to critical infrastructure components.
The technical implementation of this vulnerability stems from inadequate validation of user permissions within Argo CD's application management workflows. An attacker must first obtain legitimate access to an Argo CD system with push permissions to an application's source git or Helm repository, or possess both sync and override access to an application. This initial access point serves as the foundation for privilege escalation attempts, where the vulnerability allows attackers to bypass normal access controls and potentially gain administrative privileges. The flaw operates at the application level within Argo CD's architecture, specifically affecting how the system validates and enforces access permissions during application synchronization and management operations. This issue is classified under CWE-284, which addresses improper access control vulnerabilities, and aligns with ATT&CK technique T1078.1 for valid accounts and privilege escalation. The vulnerability's exploitation requires a combination of access rights that would typically be granted to legitimate users but creates an unexpected path for unauthorized privilege elevation.
The operational impact of CVE-2022-24768 extends beyond simple privilege escalation, potentially enabling comprehensive system compromise through unauthorized resource inspection and tampering. Attackers who successfully exploit this vulnerability can manipulate application configurations, access sensitive data, and potentially disrupt continuous delivery pipelines. The vulnerability affects organizations that rely heavily on GitOps practices, where the integrity of application source repositories and deployment workflows is paramount. Organizations using Argo CD for production deployments face significant risk, as the vulnerability could enable attackers to modify application manifests, change deployment targets, or gain access to sensitive configuration data. The potential for unauthorized resource manipulation creates cascading security implications, particularly in environments where Argo CD manages critical infrastructure components and where automated deployment processes are heavily dependent on the integrity of source repositories.
The security community has addressed this vulnerability through targeted patches released in Argo CD versions 2.3.2, 2.2.8, and 2.1.14, which provide comprehensive fixes for the improper access control issue. These patches implement enhanced validation mechanisms that properly enforce access controls during application management operations, preventing unauthorized privilege escalation attempts. While temporary mitigation measures are available, these do not provide complete protection and should be considered interim solutions until full upgrades are implemented. Organizations should implement strict access control policies limiting who can push to source repositories and who has sync and override capabilities for applications. The recommended mitigation strategies include restricting update access to applications within projects where users have elevated repository permissions, effectively creating administrative boundaries that prevent exploitation. Additionally, organizations should implement comprehensive monitoring of application access patterns and privilege changes to detect potential exploitation attempts. The vulnerability's remediation requires careful attention to Argo CD's RBAC configuration and proper implementation of least privilege principles across all application management operations.