OCSP stapling bypass in cURL

1) Improper certificate validation

EUVDB-ID: #VU97150

Risk: Low

CVSSv3.1: 3.7 [CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2024-8096

CWE-ID: CWE-295 - Improper Certificate Validation

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform MitM attack.

The vulnerability exists due to curl might fail to detect some OCSP problems when configured to use the Certificate Status Request TLS extension. A remote attacker can bypass OCSP stapling protection and perform a Man-in-the-Middle (MitM) attack.

Successful exploitation of the vulnerability requires that curl is build to use GnuTLS library.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

cURL: 7.41.0 - 8.9.1

CPE2.3

• cpe:2.3:a:curl_haxx_se:curl:8.9.1:*:*:*:*:*:*:*
• cpe:2.3:a:curl_haxx_se:curl:8.9.0:*:*:*:*:*:*:*
• cpe:2.3:a:curl_haxx_se:curl:8.8.0:*:*:*:*:*:*:*

External links

http://curl.haxx.se/docs/CVE-2024-8096.html

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.