URL Redirection to Untrusted Site ('Open Redirect') Affecting identityserver4 package, versions [0,]
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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- published1 Aug 2024
- disclosed31 Jul 2024
- creditUnknown
Introduced: 31 Jul 2024
CVE-2024-39694 (opens in a new tab)How to fix?
There is no fixed version for IdentityServer4.
Overview
IdentityServer4 is an OpenID Connect and OAuth 2.0 Framework for ASP.NET Core
Affected versions of this package are vulnerable to URL Redirection to Untrusted Site ('Open Redirect') through the commonly used GetAuthorizationContextAsync and IsValidReturnUrl methods which return non-null values and the IsValidReturnUrl method which could return true for malicious URLs.
In addition, this could be exploited through the uncommonly used ServerUrlExtensions.GetIdentityServerRelativeUrl, ReturnUrlParser.ParseAsync and OidcReturnUrlParser.ParseAsync methods that could incorrectly return non-null, and the ReturnUrlParser.IsValidReturnUrl and OidcReturnUrlParser.IsValidReturnUrl methods that could incorrectly return true for malicious URLs.
Workaround
Users who are unable to upgrade to the fixed version can use IUrlHelper.IsLocalUrl from ASP.NET Core 5.0 or later to validate return Urls in user interface code in the IdentityServer host.