#VU101763 NULL pointer dereference in jwx - CVE-2024-21664

Vulnerability identifier: #VU101763

Vulnerability risk: Low

CVSSv4.0: 1.2 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2024-21664

CWE-ID: CWE-476

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
jwx
Other software / Other software solutions

Vendor: lestrrat-go

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to a NULL pointer dereference error when calling `jws.Parse` with a JSON serialized payload where the `signature` field is present while `protected` is absent. A remote attacker can pass specially crafted data to the application and perform a denial of service (DoS) attack.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

jwx: before 1.2.28

---

External links
https://github.com/lestrrat-go/jwx/security/advisories/GHSA-pvcr-v8j8-j5q3
https://github.com/lestrrat-go/jwx/commit/0e8802ce6842625845d651456493e7c87625601f
https://github.com/lestrrat-go/jwx/commit/d69a721931a5c48b9850a42404f18e143704adcd
https://github.com/lestrrat-go/jwx/commit/8c53d0ae52d5ab1e2b37c5abb67def9e7958fd65

---

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.