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      <title>CVE-2021-41130 — X-Endpoint-API-UserInfo can be spoofed in cloudendpoints Extensible Service Proxy</title>
      <link>https://cve.radiocsirt.org/vuln/cve-2021-41130</link>
      <description>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; cloudendpoints esp&lt;/p&gt;
&lt;p&gt;Extensible Service Proxy, a.k.a. ESP is a proxy which enables API management capabilities for JSON/REST or gRPC API services. ESPv1 can be configured to authenticate a JWT token. Its verified JWT claim is passed to the application by HTTP header &amp;#34;X-Endpoint-API-UserInfo&amp;#34;, the application can use it to do authorization. But if there are two &amp;#34;X-Endpoint-API-UserInfo&amp;#34; headers from the client, ESPv1 only replaces the first one, the 2nd one will be passed to the application. An attacker can send two &amp;#34;X-Endpoint-API-UserInfo&amp;#34; headers, the second one with a fake JWT claim. Application may use the fake JWT claim to do the authorization. This impacts following ESPv1 usages: 1) Users have configured ESPv1 to do JWT authentication with Google ID Token as described in the referenced google endpoint document. 2) Users backend application is using the info in the &amp;#34;X-Endpoint-API-UserInfo&amp;#34; header to do the authorization. It has been fixed by v1.58.0. You need to patch it in the following ways: * If your docker image is using tag &amp;#34;:1&amp;#34;, needs to re-start the container to pick up the new version. The tag &amp;#34;:1&amp;#34; will automatically point to the latest version. * If your docker image tag pings to a specific minor version, e.g. &amp;#34;:1.57&amp;#34;. You need to update it to &amp;#34;:1.58&amp;#34; and re-start the container. There are no workaround for this issue.&lt;/p&gt;</description>
      <content:encoded>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; cloudendpoints esp&lt;/p&gt;
&lt;p&gt;Extensible Service Proxy, a.k.a. ESP is a proxy which enables API management capabilities for JSON/REST or gRPC API services. ESPv1 can be configured to authenticate a JWT token. Its verified JWT claim is passed to the application by HTTP header &amp;#34;X-Endpoint-API-UserInfo&amp;#34;, the application can use it to do authorization. But if there are two &amp;#34;X-Endpoint-API-UserInfo&amp;#34; headers from the client, ESPv1 only replaces the first one, the 2nd one will be passed to the application. An attacker can send two &amp;#34;X-Endpoint-API-UserInfo&amp;#34; headers, the second one with a fake JWT claim. Application may use the fake JWT claim to do the authorization. This impacts following ESPv1 usages: 1) Users have configured ESPv1 to do JWT authentication with Google ID Token as described in the referenced google endpoint document. 2) Users backend application is using the info in the &amp;#34;X-Endpoint-API-UserInfo&amp;#34; header to do the authorization. It has been fixed by v1.58.0. You need to patch it in the following ways: * If your docker image is using tag &amp;#34;:1&amp;#34;, needs to re-start the container to pick up the new version. The tag &amp;#34;:1&amp;#34; will automatically point to the latest version. * If your docker image tag pings to a specific minor version, e.g. &amp;#34;:1.57&amp;#34;. You need to update it to &amp;#34;:1.58&amp;#34; and re-start the container. There are no workaround for this issue.&lt;/p&gt;</content:encoded>
      <guid isPermaLink="false">https://cve.radiocsirt.org/vuln/cve-2021-41130</guid>
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