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bdu:2024-02250

EUVD-2026-8529

fkie_cve-2024-21661

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 exploit a critical flaw in the application to initiate a Denial of Service (DoS) attack, rendering the application inoperable and affecting all users. The issue arises from unsafe manipulation of an array in a multi-threaded environment. The vulnerability is rooted in the application's code, where an array is being modified while it is being iterated over. This is a classic programming error but becomes critically unsafe when executed in a multi-threaded environment. When two threads interact with the same array simultaneously, the application crashes. This is a Denial of Service (DoS) vulnerability. Any attacker can crash the application continuously, making it impossible for legitimate users to access the service. The issue is exacerbated because it does not require authentication, widening the pool of potential attackers. Versions 2.8.13, 2.9.9, and 2.10.4 contain a patch for this issue.

GHSA-6v85-wr92-q4p7 — Denial of Service (DoS) Vulnerability Due to Unsafe Array Modification in Multi-threaded Environment

Affected: Go: github.com/argoproj/argo-cd, Go: github.com/argoproj/argo-cd/v2

### Summary An attacker can exploit a critical flaw in the application to initiate a Denial of Service (DoS) attack, rendering the application inoperable and affecting all users. The issue arises from unsafe manipulation of an array in a multi-threaded environment.

### Details The vulnerability is rooted in the application's code, where an array is being modified while it is being iterated over. This is a classic programming error but becomes critically unsafe when executed in a multi-threaded environment. When two threads interact with the same array simultaneously, the application crashes.

The core issue is located in [expireOldFailedAttempts](https://github.com/argoproj/argo-cd/blob/54601c8fd30b86a4c4b7eb449956264372c8bde0/util/session/sessionmanager.go#L302-L311) function: ```go func expireOldFailedAttempts(maxAge time.Duration, failures *map[string]LoginAttempts) int {

expiredCount := 0 for key, attempt := range *failures {

if time.Since(attempt.LastFailed) > maxAge*time.Second { expiredCount += 1 delete(*failures, key) // Vulnerable code

} }

return expiredCount } ```

The function modifies the array while iterating it which means the code will cause an error and crash the application pod, inspecting the logs just before the crash we can confirm: ```go goroutine 2032 [running]: github.com/argoproj/argo-cd/v2/util/session.expireOldFailedAttempts(0x12c, 0xc000adecd8)

/go/src/github.com/argoproj/argo-cd/util/session/sessionmanager.go:304 +0x7c github.com/argopro…

gsd-2024-21661

RHSA-2024:1697 — Red Hat Security Advisory: Errata Advisory for Red Hat OpenShift GitOps v1.11.3 security update

CD: Users with `create` but not `override` privileges can perform local sync argo-cd: Bypassing Brute Force Protection via Application Crash and In-Memory Data Loss argo-cd: Denial of Service Due to Unsafe Array Modification in Multi-threaded Environment argo-cd: Bypassing Rate Limit and Brute Force Protection Using Cache Overflow argo-cd: uncontrolled memory allocation vulnerability

WID-SEC-W-2024-0812 — Red Hat OpenShift: Mehrere Schwachstellen

Ein entfernter, anonymer Angreifer kann mehrere Schwachstellen in Red Hat OpenShift ausnutzen, um einen Denial of Service Angriff durchzuführen oder um Sicherheitsmaßnahmen zu umgehen.