Overview
The CVE-2024-0567 vulnerability is a flaw in GnuTLS that allows an unauthenticated, remote attacker to initiate a denial of service attack. This vulnerability is particularly concerning due to its potential to result in system compromise or data leakage. Entities using GnuTLS, especially those utilizing cockpit-certificate-ensure, should be aware of this vulnerability and take steps to mitigate its impact.
Vulnerability Summary
CVE ID: CVE-2024-0567
Severity: High (CVSS: 7.5)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: Denial of Service leading to potential system compromise or data leakage
Affected Products
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Product | Affected Versions
GnuTLS | All versions prior to the patched version
Cockpit | All versions utilizing GnuTLS prior to the patched version
How the Exploit Works
The exploit takes advantage of a flaw in GnuTLS when it is used by Cockpit to validate a certificate chain. If the certificate chain involves distributed trust, it is erroneously rejected. An attacker can exploit this flaw to initiate a Denial of Service (DoS) attack by sending a specifically crafted certificate chain intended to trigger this flaw, thereby bringing down the service and potentially leading to system compromise or data leakage.
Conceptual Example Code
This is a conceptual representation of an attack, using a specifically crafted certificate chain designed to trigger the flaw in the target system:
POST /cockpit-certificate-ensure HTTP/1.1
Host: target.example.com
Content-Type: application/x-x509-ca-cert
-----BEGIN CERTIFICATE-----
[Malicious crafted certificate chain]
-----END CERTIFICATE-----Note: This is a theoretical example and may not reflect the exact method an attacker would use to exploit this vulnerability.
