^{CVE-2022-31034:}CVE-2022-31034 describes insecure entropy in Argo CD's OAuth2/OIDC login flows, which can potentially allow an attacker with SSO access to gain admin privileges. The vulnerability affects Argo CD versions starting from v0.11.0 up to just before the patched releases, with patches released in v2.1.16, v2.2.10, v2.3.5, and v2.4.1. There are no known workarounds; upgrading to a patched version is required.

Argo CD is a declarative GitOps tool for Kubernetes. All versions beginning with v0.11.0 are susceptible to attacks during SSO login initiated via the Argo CD CLI or UI due to the use of insufficiently random values in OAuth2/OIDC login parameters. The root cause is the use of a relatively predictable or low-entropy seed in a non-cryptographically secure PRNG, resulting in weaker randomness than required by the relevant specifications and best practices. In some cases, the entropy is even lower due to overly short values. While exploitability in login flows is non-trivial, successful exploitation can potentially grant an attacker admin access to Argo CD. The vendor has released patches in several versions: v2.4.1, v2.3.5, v2.2.10, and v2.1.16. There are no known workarounds for this vulnerability.

Overview

Argo CD versions vulnerable to insecure entropy in OAuth2/OIDC login flows can expose administrative access through SSO authentication. The issue stems from insufficient randomness in login parameters, which compromises the security of SSO login processes. Patches have been released in specific later versions (2.1.16, 2.2.10, 2.3.5, 2.4.1), and all versions starting from v0.11.0 up to just before these fixes are affected. The CVSS score is high, reflecting significant impact to confidentiality, integrity, and availability, with no known workarounds.

Remediation

• Upgrade to a patched Argo CD version (preferred): use one of the fixed releases — v2.1.16, v2.2.10, v2.3.5, or v2.4.1 — with v2.4.1 being the latest among the listed fixes. Where possible, upgrade to the latest patched release to ensure future fixes and security improvements.
• Plan and perform the upgrade with standard change-management practices:
  • Back up configuration and any custom plugins or tooling.
  • Test the upgrade in a staging environment compatible with your cluster.
  • Apply the upgrade (via Helm charts, manifests, or your typical deployment method) and verify pod status and Argo CD server health.
  • Validate that the Argo CD version shows the patched release.
• Post-upgrade validation:
  • Verify that SSO/OIDC login flows function correctly and that login tokens are issued with proper entropy.
  • Conduct basic login flow tests to ensure no regression or unexpected access issues.
• Credential and access review:
  • Rotate admin credentials and re-key any SSO client secrets or tokens that may have been exposed.
  • Review and tighten admin access controls; implement least-privilege policies for Argo CD roles.
• Monitoring and auditing:
  • Enable or review login event auditing and monitor for anomalous authentication or admin activity.
  • Review identity-provider logs for any suspicious SSO attempts.
• If upgrade is not feasible in the near term:
  • There are no known safe workarounds to fix the underlying issue; mitigate exposure by restricting network access to Argo CD UI/API to trusted networks and ensuring strong authentication controls, while planning the upgrade.
  • Develop a remediation timeline and communicate with stakeholders about the heightened risk during the interim period.

References

• GHSA advisory: https://github.com/argoproj/argo-cd/security/advisories/GHSA-2m7h-86qq-fp4v
• Commit with patch details: https://github.com/argoproj/argo-cd/commit/17f7f4f462bdb233e1b9b36f67099f41052d8cb0
• MITRE CVE entry: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-31034