Argo CD is a declarative, GitOps continuous delivery tool for Kubernetes. Prior to versions 2.8.13, 2.9.9, and 2.10.4, an attacker can effectively bypass the rate limit and brute force protections by exploiting the application's weak cache-based mechanism. This loophole in security can be combined with other vulnerabilities to attack the default admin account. This flaw undermines a patch for CVE-2020-8827 intended to protect against brute-force attacks. The application's brute force protection relies on a cache mechanism that tracks login attempts for each user. This cache is limited to a `defaultMaxCacheSize` of 1000 entries. An attacker can overflow this cache by bombarding it with login attempts for different users, thereby pushing out the admin account's failed attempts and effectively resetting the rate limit for that account. This is a severe vulnerability that enables attackers to perform brute force attacks at an accelerated rate, especially targeting the default admin account. Users should upgrade to version 2.8.13, 2.9.9, or 2.10.4 to receive a patch.

There are packages installed that are affected by a vulnerability referenced in the following CVE:

  - Argo CD is a declarative, GitOps continuous delivery tool for Kubernetes. Prior to versions 2.8.13, 2.9.9,
    and 2.10.4, an attacker can effectively bypass the rate limit and brute force protections by exploiting
    the application's weak cache-based mechanism. This loophole in security can be combined with other
    vulnerabilities to attack the default admin account. This flaw undermines a patch for CVE-2020-8827
    intended to protect against brute-force attacks. The application's brute force protection relies on a
    cache mechanism that tracks login attempts for each user. This cache is limited to a `defaultMaxCacheSize`
    of 1000 entries. An attacker can overflow this cache by bombarding it with login attempts for different
    users, thereby pushing out the admin account's failed attempts and effectively resetting the rate limit
    for that account. This is a severe vulnerability that enables attackers to perform brute force attacks at
    an accelerated rate, especially targeting the default admin account. Users should upgrade to version
    2.8.13, 2.9.9, or 2.10.4 to receive a patch. (CVE-2024-21662)

The remote Redhat Enterprise Linux 8 / 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2024:1752 advisory.

    Errata Advisory for Red Hat OpenShift GitOps v1.12.1- Argo CD CLI and MicroShift GitOps.

    Security Fix(es):

    * argo-cd: Denial of Service Due to Unsafe Array Modification in Multi-threaded Environment     (CVE-2024-21661)

    * argo-cd: Users with `create` but not `override` privileges can perform local     sync (CVE-2023-50726)

    * argo-cd: Bypassing Brute Force Protection via Application Crash and In-Memory Data Loss (CVE-2024-21652)

    * argo-cd: uncontrolled resource consumption vulnerability (CVE-2024-29893)

    * argo-cd: Bypassing Rate Limit and Brute Force Protection Using Cache Overflow (CVE-2024-21662)

    For more details about the security issue(s), including the impact, a CVSS     score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References     section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

ID	Name	Product	Family	Severity
409107	SCA: security update for github.com/argoproj/argo-cd/v2 (GHSA-2vgg-9h6w-m454)	Tenable Cloud Security	SCA Checks	critical
409107	SCA: security update for github.com/argoproj/argo-cd/v2 (GHSA-2vgg-9h6w-m454)	Tenable Self-Hosted Container Security	SCA Checks	critical
193172	RHEL 8 / 9 : GitOps 1.12.1- Argo CD CLI and MicroShift GitOps (RHSA-2024:1752)	Nessus	Red Hat Local Security Checks	critical

Detections

Analytics

CVE-2024-21662

critical

Tenable Plugins

critical

critical

critical