CVE-2022-24348: Argo CD Path Traversal Vulnerability

CVE-2022-24348 Overview

CVE-2022-24348 is a directory traversal vulnerability affecting Argo CD, the popular GitOps continuous delivery tool for Kubernetes. The vulnerability exists in the helmTemplate function within repository.go and allows authenticated attackers to exploit path traversal sequences when processing Helm charts. Successful exploitation enables attackers to read sensitive files outside the intended directory scope, potentially exposing credentials and other sensitive information stored in YAML configuration files.

Critical Impact

Authenticated attackers can leverage malicious Helm charts to traverse directories and access sensitive credentials stored in YAML files within Argo CD deployments, potentially compromising Kubernetes cluster security.

Affected Products

• Argo CD versions before 2.1.9
• Argo CD versions 2.2.x before 2.2.4
• All Kubernetes environments using vulnerable Argo CD installations

Discovery Timeline

• 2022-02-04 - CVE-2022-24348 published to NVD
• 2024-11-21 - Last updated in NVD database

Technical Details for CVE-2022-24348

Vulnerability Analysis

This directory traversal vulnerability (CWE-22) originates from improper input validation in the Helm chart template processing functionality of Argo CD. The flaw in helmTemplate within repository.go fails to adequately sanitize file path inputs, allowing attackers to craft malicious Helm charts containing path traversal sequences that escape the expected working directory.

The vulnerability is particularly concerning in multi-tenant Kubernetes environments where Argo CD manages deployments across different namespaces and applications. An attacker with low privileges can exploit this flaw to access sensitive information belonging to other tenants or the Argo CD infrastructure itself.

The attack can be executed remotely over the network without user interaction, though it does require authentication to the Argo CD instance. The scope of impact extends beyond the vulnerable component, as exposed credentials could be used to compromise other systems and services.

Root Cause

The root cause lies in insufficient path validation within the helmTemplate function in repository.go. When Argo CD processes Helm charts, it fails to properly validate and sanitize file paths, allowing directory traversal sequences (such as ../) to be processed. This enables attackers to reference files outside the intended chart directory structure, bypassing the expected security boundaries.

Attack Vector

The attack leverages Argo CD's Helm chart processing mechanism. An attacker with the ability to submit or modify Helm charts can include malicious path traversal sequences within chart templates or values files. When Argo CD processes these charts, the traversal sequences are resolved, allowing the attacker to read arbitrary files accessible to the Argo CD process.

The attack vector requires network access to the Argo CD instance and valid authentication credentials with permissions to deploy or modify Helm-based applications. Once exploited, attackers can extract sensitive information including repository credentials, cluster secrets, and other configuration data stored in YAML format.

For detailed technical analysis of the exploitation mechanism, refer to the Apiiro security research blog post.

Detection Methods for CVE-2022-24348

Indicators of Compromise

• Helm charts containing unusual path traversal patterns (../, ..%2f, or encoded variants)
• Unexpected file access attempts by the Argo CD repo-server component
• Audit log entries showing access to sensitive configuration files outside application directories
• Application manifests referencing paths outside the expected chart structure

Detection Strategies

• Monitor Argo CD application logs for path traversal patterns and file access anomalies
• Implement file integrity monitoring on Argo CD configuration directories
• Review Helm chart contents for suspicious path references before deployment approval
• Enable audit logging for all Argo CD API operations and repository access

Monitoring Recommendations

• Configure alerts for unusual file system access patterns by argocd-repo-server pods
• Monitor for new or modified Helm charts in connected repositories
• Implement network monitoring to detect data exfiltration attempts from Argo CD components
• Review Argo CD RBAC configurations to ensure least-privilege access

How to Mitigate CVE-2022-24348

Immediate Actions Required

• Upgrade Argo CD to version 2.1.9 or later for the 2.1.x branch
• Upgrade Argo CD to version 2.2.4 or later for the 2.2.x branch
• Audit existing Helm charts in connected repositories for malicious content
• Review Argo CD access logs for signs of exploitation attempts

Patch Information

The Argo CD project has released patched versions that address this vulnerability. Users running Argo CD 2.1.x should upgrade to version 2.1.9 or later, while users on the 2.2.x branch should upgrade to version 2.2.4 or later. The patches implement proper path validation in the helmTemplate function to prevent directory traversal attacks.

For complete patch details and upgrade instructions, consult the GitHub Security Advisory GHSA-63qx-x74g-jcr7.

Workarounds

• Restrict Helm chart sources to trusted repositories only
• Implement strict code review processes for all Helm charts before deployment
• Use Argo CD's repository credential isolation features to limit credential exposure
• Consider implementing OPA Gatekeeper or Kyverno policies to scan Helm charts for path traversal patterns

# Verify current Argo CD version
kubectl get pods -n argocd -l app.kubernetes.io/name=argocd-server -o jsonpath='{.items[0].spec.containers[0].image}'

# Upgrade Argo CD using Helm (example for 2.2.4+)
helm upgrade argocd argo/argo-cd --namespace argocd --version 4.2.0