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Security Advisories: GSA_kwCzR0hTQS01NXA3LXYyMjMteDM2Ns4AA-TC

IdentityServer Open Redirect vulnerability

Impact

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.

Affected Methods

In the DefaultIdentityServerInteractionService, the GetAuthorizationContextAsync method may return non-null and the IsValidReturnUrl method may return true for malicious Urls, indicating incorrectly that they can be safely redirected to.

UI code calling these two methods is the most commonly used code path that will expose the vulnerability. The default UI templates rely on this behavior in the Login, Challenge, and Consent pages. Customized user interface code might also rely on this behavior. The following uncommonly used APIs are also vulnerable:
The ServerUrlExtensions.GetIdentityServerRelativeUrl, ReturnUrlParser.ParseAsync and OidcReturnUrlParser.ParseAsync methods may incorrectly return non-null, and the ReturnUrlParser.IsValidReturnUrl and OidcReturnUrlParser.IsValidReturnUrl methods may incorrectly return true for malicious Urls.

Patches

IdentityServer4 is no longer supported and will not be receiving updates. Please consider updating to Duende.IdentityServer.

Permalink: https://github.com/advisories/GHSA-55p7-v223-x366
JSON: https://advisories.ecosyste.ms/api/v1/advisories/GSA_kwCzR0hTQS01NXA3LXYyMjMteDM2Ns4AA-TC
Source: GitHub Advisory Database
Origin: Unspecified
Severity: Moderate
Classification: General
Published: 3 months ago
Updated: 3 months ago

CVSS Score: 4.7
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:N/A:N

Identifiers: GHSA-55p7-v223-x366
References:

Repository: https://github.com/DuendeSoftware/IdentityServer
Blast Radius: 1.0

Affected Packages

nuget:IdentityServer4

Dependent packages: 176
Dependent repositories: 0
Downloads: 55,121,379 total
Affected Version Ranges: <= 4.1.2
No known fixed version
All affected versions: 1.0.0, 1.0.1, 1.0.2, 1.1.0, 1.1.1, 1.2.0, 1.2.1, 1.3.0, 1.3.1, 1.4.0, 1.4.1, 1.4.2, 1.5.0, 1.5.1, 1.5.2, 1.5.3, 2.0.0, 2.0.1, 2.0.2, 2.0.3, 2.0.4, 2.0.5, 2.0.6, 2.1.0, 2.1.1, 2.1.2, 2.1.3, 2.2.0, 2.3.0, 2.3.1, 2.3.2, 2.4.0, 2.5.0, 2.5.1, 2.5.2, 2.5.3, 2.5.4, 3.0.1, 3.0.2, 3.1.0, 3.1.1, 3.1.2, 3.1.3, 3.1.4, 4.0.0, 4.0.1, 4.0.2, 4.0.3, 4.0.4, 4.1.0, 4.1.1, 4.1.2