CVE-2023-40584: Denial of Service to Argo CD repo-server
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
Other sources
Argo CD is a declarative continuous deployment for Kubernetes. 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. A patch for this vulnerability has been released in versions 2.6.15, 2.7.14, and 2.8.3. Users are advised to upgrade. The only way to completely resolve the issue is to upgrade, however users unable to upgrade should 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.
— MITRE
Affected Software
Remediation
Event History
Frequently Asked Questions
What is CVE-2023-40584?
CVE-2023-40584 is a vulnerability in the ArgoCD repo-server component that allows for a Denial-of-Service attack.
What is the impact of CVE-2023-40584?
The impact of CVE-2023-40584 is a Denial-of-Service attack vector.
Which versions of ArgoCD are affected by CVE-2023-40584?
All versions of ArgoCD starting from v2.4 up to, but not including, v2.6.
How can the CVE-2023-40584 vulnerability be fixed?
To fix CVE-2023-40584, upgrade ArgoCD to version 2.6 or higher.
Where can I find more information about CVE-2023-40584?
You can find more information about CVE-2023-40584 at the following references: [Link 1](https://access.redhat.com/errata/RHSA-2023:5029), [Link 2](https://access.redhat.com/errata/RHSA-2023:5030), [Link 3](https://bugzilla.redhat.com/show_bug.cgi?id=2236530).