GHSA-g687-f2gx-6wm8 Argo CD repo-server Denial of Service vulnerability

• Go github.com/argoproj/argo-cd/v2: >= 2.4.0, < 2.6.15 → fixed in 2.6.15 • Go github.com/argoproj/argo-cd/v2: >= 2.7.0, < 2.7.14 → fixed in 2.7.14 • Go github.com/argoproj/argo-cd/v2: >= 2.8.0, < 2.8.3 → fixed in 2.8.3

Impact All versions of ArgoCD starting from v2.4 have a bug where the ArgoCD repo-server component is vulnerable to a Denial-of-Service attack vector. Specifically, the said component extracts a user-controlled tar.gz file without validating the size of its inner files. As a result, a malicious, low-privileged user can send a malicious tar.gz file that exploits this vulnerability to the repo-server, thereby harming the system's functionality and availability. Additionally, the repo-server is susceptible to another vulnerability due to the fact that it does not check the extracted file permissions before attempting to delete them. Consequently, an attacker can craft a malicious tar.gz archive in a way that prevents the deletion of its inner files when the manifest generation process is completed. Patches A patch for this vulnerability has been released in the following Argo CD versions: • v2.6.15 • v2.7.14 • v2.8.3 Workarounds The only way to completely resolve the issue is to upgrade. Mitigations Configure RBAC (Role-Based Access Control) and provide access for configuring applications only to a limited number of administrators. These administrators should utilize trusted and verified Helm charts. For more information If you have any questions or comments about this advisory: • Open an issue in the Argo CD issue tracker or discussions • Join us on Slack in channel #argo-cd Credits This vulnerability was found & reported by GE Vernova – Amit Laish. The Argo team would like to thank these contributors for their responsible disclosure and constructive communications during the resolve of this issue