CVE-2024-39694

Summary

Duende IdentityServer is an OpenID Connect and OAuth 2.x framework for ASP.NET Core. It is possible for an attacker to craft malicious Urls that certain functions in IdentityServer will incorrectly treat as local and trusted. If such a Url is returned as a redirect, some browsers will follow it to a third-party, untrusted site. Note: by itself, this vulnerability does not allow an attacker to obtain user credentials, authorization codes, access tokens, refresh tokens, or identity tokens. An attacker could however exploit this vulnerability as part of a phishing attack designed to steal user credentials. This vulnerability is fixed in 7.0.6, 6.3.10, 6.2.5, 6.1.8, and 6.0.5. Duende.IdentityServer 5.1 and earlier and all versions of IdentityServer4 are no longer supported and will not be receiving updates. If upgrading is not possible, use IUrlHelper.IsLocalUrl from ASP.NET Core to validate return Urls in user interface code in the IdentityServer host.

Affected Software

VendorProductVersion RangeStatus
DuendeSoftwareIdentityServer< 6.0.5affected
DuendeSoftwareIdentityServer>= 6.1.0-preview.1, <= 6.1.7affected
DuendeSoftwareIdentityServer>= 6.2.0-preview.1, <= 6.2.4affected
DuendeSoftwareIdentityServer>= 6.3.0-preview.1, <= 6.3.9affected
DuendeSoftwareIdentityServer>= 7.0.0-preview.1, <= 7.0.5affected

Weaknesses

  • CWE-601: CWE-601: URL Redirection to Untrusted Site ('Open Redirect')

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: no
    • Technical Impact: partial

References