CVE-2022-1025: 
Argo CD vulnerability analysis and mitigation

All unpatched versions of Argo CD starting with v1.0.0 are vulnerable to an improper access control bug (CVE-2022-1025), allowing a malicious user to potentially escalate their privileges to admin-level. The vulnerability was discovered and disclosed in March 2022, affecting all versions from v1.0.0 through 2.1.12, 2.2.7, and 2.3.1 (GitHub Advisory).

The vulnerability stems from an improper access control implementation that allows privilege escalation through multiple attack vectors. The vulnerability has been assigned a Critical severity with a CVSS v3.1 base score of 10.0, indicating the highest level of severity. The vulnerability is classified under CWE-1220 and CWE-284, relating to improper access control mechanisms (GitHub Advisory).

The vulnerability allows an authorized Argo CD user with push access to an Application's source git or Helm repository, or sync and override access, to perform unauthorized actions. Users with update access can modify any resource on the destination cluster and potentially escalate to admin-level permissions. Those with delete access can remove any resource, while users with get access can view resources (except secrets) and pod logs. Additionally, users with action privileges can execute actions on any supported resource in the destination cluster (GitHub Advisory).

The vulnerability requires an attacker to have initial authorized access to the system with specific permissions. The exploit can be triggered through multiple vectors depending on the user's RBAC privileges, including update, delete, get, or action access to Applications. A related exploit is also possible for users with get access to an Application, allowing them to access any Event in the Application's destination cluster if they know the involved object's name, UID, and namespace (GitHub Advisory).

The vulnerability has been patched in Argo CD versions v2.3.2, v2.2.8, and v2.1.14. For argo-helm chart users, version 4.2.2 addresses this vulnerability. Temporary mitigations include limiting push access to Application source repositories, restricting sync and override access to Applications, and limiting repository availability in projects where users have update access. However, these mitigations are not substitutes for upgrading, which is strongly recommended (GitHub Advisory).