CVE-2024-8096 OCSP stapling bypass with GnuTLS

2024-09-1110:03:59

curl

github.com

cve-2024-8096

ocsp stapling

gnutls

certificate status request

tls extension

curl

server certificate

ocsp problems

revoked

unauthorized

EPSS

Percentile

16.4%

SSVC

Exploitation

none

Automatable

yes

Technical Impact

partial

JSON

When curl is told to use the Certificate Status Request TLS extension, often referred to as OCSP stapling, to verify that the server certificate is valid, it might fail to detect some OCSP problems and instead wrongly consider the response as fine. If the returned status reports another error than ‘revoked’ (like for example ‘unauthorized’) it is not treated as a bad certficate.

ADP Affected

[
  {
    "cpes": [
      "cpe:2.3:a:curl:curl:*:*:*:*:*:*:*:*"
    ],
    "vendor": "curl",
    "product": "curl",
    "versions": [
      {
        "status": "affected",
        "version": "7.41.0",
        "versionType": "semver",
        "lessThanOrEqual": "8.9.1"
      }
    ],
    "defaultStatus": "unknown"
  }
]