Improper Authentication Affecting duende.identityserver package, versions [7.0.0,7.0.8)
Threat Intelligence
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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- published29 Oct 2024
- disclosed28 Oct 2024
- creditUnknown
Introduced: 28 Oct 2024
CVE-2024-49755 (opens in a new tab)How to fix?
Upgrade Duende.IdentityServer to version 7.0.8 or higher.
Overview
Affected versions of this package are vulnerable to Improper Authentication due to insufficient validation of the cnf claim in DPoP access tokens. An attacker can use leaked DPoP access tokens at local API endpoints without possessing the private key for signing proof tokens.
Note:
This is only exploitable if IdentityServer implementations are using the local APIs feature and have explicitly enabled DPoP for local APIs.