Withdrawn by the publisher.

Affected: CleanStart: apache-hive

Multiple security vulnerabilities affect the apache-hive package. Netty is an asynchronous, event-driven network application framework. See references for individual vulnerability details.

Netty is an asynchronous, event-driven network application framework. Prior to 4.1.137.Final and 4.2.17.Final, io.netty.handler.codec.http.cors.CorsHandler setVaryHeader replaces application Vary headers such as Authorization or Cookie with Origin, allowing a caching proxy or CDN to reuse authenticated responses across users and disclose sensitive information. This issue is fixed in versions 4.1.137.Final and 4.2.17.Final.

Affected: Maven: io.netty:netty-codec-http

### Summary Netty's `CorsHandler` silently overwrites existing `Vary` headers, enabling cache poisoning and sensitive information disclosure.

### Details `io.netty.handler.codec.http.cors.CorsHandler#setVaryHeader` overwrites any existing Vary headers set by backend applications.

```java private static void setVaryHeader(final HttpResponse response) { response.headers().set(HttpHeaderNames.VARY, HttpHeaderNames.ORIGIN); } ```

Because `set()` replaces all existing values for the header, if a backend application sets a `Vary` header (such as `Vary: Authorization` or `Vary: Cookie`) to ensure that intermediate caches (like CDNs) cache responses separately per user, the `CorsHandler` will overwrite it with `Vary: origin`. This causes the caching proxy to ignore the authorization context and cache the response based solely on the URL and Origin, allowing an attacker to retrieve another user's cached sensitive data.

### Impact This is a Cache Poisoning vulnerability that leads to Information Disclosure. It impacts any Netty-based web application that uses the CorsHandler, sets its own Vary headers to manage caching of authenticated or user-specific responses (e.g., Vary: Authorization), and is deployed behind a caching proxy or CDN. The end-users of these applications are impacted, as their sensitive data may be leaked to unauthorized actors.

netty-4.1.138-1.1 on GA media

Affected: Ubuntu:Pro:14.04:LTS: netty, Ubuntu:Pro:16.04:LTS: netty, Ubuntu:Pro:18.04:LTS: netty, Ubuntu:Pro:20.04:LTS: netty, Ubuntu:Pro:22.04:LTS: netty, Ubuntu:Pro:24.04:LTS: netty, Ubuntu:Pro:26.04:LTS: netty

Netty is an asynchronous, event-driven network application framework. Prior to 4.1.137.Final and 4.2.17.Final, io.netty.handler.codec.http.cors.CorsHandler setVaryHeader replaces application Vary headers such as Authorization or Cookie with Origin, allowing a caching proxy or CDN to reuse authenticated responses across users and disclose sensitive information. This issue is fixed in versions 4.1.137.Final and 4.2.17.Final.

Ein Angreifer kann mehrere Schwachstellen in Netty ausnutzen, um Sicherheitsvorkehrungen zu umgehen, um einen Denial of Service Angriff durchzuführen, und um Informationen offenzulegen.