CVE-2024-49755: Duende.IdentityServer Duende IdentityServer Has Insufficient Validation Vulnerability
LOWCVE-2024-49755 is a LOW (CVSS 3.1) duende identityserver has insufficient validation vulnerability (CWE-287: Improper Authentication) affecting Duende.IdentityServer libraries in the NuGet ecosystem. The issue involves duende identityserver has insufficient validation of dpop cnf claim in local apis. Remediation is available by upgrading affected packages to version 7.0.8.
CVE-2024-49755 at a Glance
Security Impact
CVSS: 3.1
The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N).
How to Fix CVE-2024-49755
To remediate this vulnerability, upgrade all affected Duende.IdentityServer dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.
Upgrade Duende.IdentityServer to 7.0.8Run the following command in your project directory to verify that all resolved dependencies use the patched release:
inspect dependencies for Duende.IdentityServerHow to Check if You Are Affected
To determine whether your application is affected by CVE-2024-49755, inspect your project dependencies for Duende.IdentityServer:
inspect dependencies for Duende.IdentityServerAnalyze the terminal output to locate any version of Duende.IdentityServer in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 7.0.8), your application is affected.
Note: Verify declared build manifests and deployed runtime container environments.
Technical Details
Vulnerability Mechanism & Technical Analysis
This vulnerability is classified under CWE-287: Improper Authentication, where when an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct. In Duende.IdentityServer, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.
Source Advisory Statement
CVE-2024-49755 Affected Duende.IdentityServer Versions
1 component(s)| Product / Package | Ecosystem | Affected Versions | Fixed Version |
|---|---|---|---|
|
Duende.IdentityServer
|
NuGet |
≥ 7.0.0
< 7.0.8
|
7.0.8
|
References
Frequently Asked Questions
What is CVE-2024-49755?
Which Duende.IdentityServer versions are affected?
What version fixes CVE-2024-49755?
Is Duende.IdentityServer affected?
What is the CVSS score of CVE-2024-49755?
What CWE is associated with CVE-2024-49755?
How can I check NuGet dependencies for CVE-2024-49755?
Machine-readable OSV JSON
OSV v1.5 Schema
{
"schema_version" : "1.4.0",
"id" : "GHSA-v9xq-2mvm-x8xc",
"modified" : "2024-10-28T21:49:51Z",
"published" : "2024-10-28T19:44:10Z",
"aliases" : [ "CVE-2024-49755" ],
"summary" : "Duende IdentityServer has insufficient validation of DPoP cnf claim in Local APIs ",
"details" : "### Impact\nIdentityServer's local API authentication handler performs insufficient validation of the `cnf` claim in DPoP access tokens. This allows an attacker to use leaked DPoP access tokens at local api endpoints even without possessing the private key for signing proof tokens.\n\nNote that this only impacts custom endpoints within an IdentityServer implementation that have explicitly used the `LocalApiAuthenticationHandler` for authentication. It does not impact:\n- OAuth or OIDC protocol endpoints defined by IdentityServer, such as the authorize and token endpoints.\n- Typical UI pages within an IdentityServer implementation, which are not normally authorized with the local API authentication handler.\n- The use of DPoP to create sender-constrained tokens in IdentityServer that are consumed by external API resources.\n- The use of DPoP to sender-constrain refresh tokens issued to public clients.\n\n## Are you affected?\n\nThis vulnerability only affects IdentityServer implementations that are using the local APIs feature of IdentityServer and have explicitly enabled DPoP for local APIs. The local api authentication handler is configured with a call to either `AddLocalApi` or `AddLocalApiAuthentication`, and the opt-in to DPoP for local APIs is enabled via the `TokenMode` option. \n\nVulnerable implementations of IdentityServer would have configuration code similar to the following:\n\n```cs\nservices.AddAuthentication()\n .AddLocalApi(\"local\", options => \n {\n options.TokenMode = LocalApiTokenMode.DPoPAndBearer; // or LocalApiTokenMode.DPoPOnly\n });\n```\n\n### Patches\nThis vulnerability is patched in IdentityServer 7.0.8. Version 6.3 and below are unaffected, as they do not support DPoP in Local APIs.\n",
"severity" : [ {
"type" : "CVSS_V3",
"score" : "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N"
}, {
"type" : "CVSS_V4",
"score" : "CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:P/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N"
} ],
"affected" : [ {
"package" : {
"ecosystem" : "NuGet",
"name" : "Duende.IdentityServer"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "7.0.0"
}, {
"fixed" : "7.0.8"
} ]
} ]
} ],
"references" : [ {
"type" : "WEB",
"url" : "https://github.com/DuendeSoftware/IdentityServer/security/advisories/GHSA-v9xq-2mvm-x8xc"
}, {
"type" : "ADVISORY",
"url" : "https://nvd.nist.gov/vuln/detail/CVE-2024-49755"
}, {
"type" : "WEB",
"url" : "https://github.com/DuendeSoftware/IdentityServer/commit/f28cac921c1f545afe65af71a9327224755b6dac"
}, {
"type" : "PACKAGE",
"url" : "https://github.com/DuendeSoftware/IdentityServer"
} ],
"database_specific" : {
"cwe_ids" : [ "CWE-287" ],
"severity" : "LOW",
"github_reviewed" : true,
"github_reviewed_at" : "2024-10-28T19:44:10Z",
"nvd_published_at" : "2024-10-28T20:15:06Z"
}
}