CVE-2025-58056

Ein entfernter, anonymer Angreifer kann mehrere Schwachstellen in IBM SPSS ausnutzen, um einen Denial of Service Angriff durchzuführen, und um Sicherheitsvorkehrungen zu umgehen.

Ein entfernter, anonymer Angreifer kann mehrere Schwachstellen in Red Hat Enterprise Linux ausnutzen, um Sicherheitsvorkehrungen zu umgehen oder einen Denial of Service auszuführen.

Ein entfernter, anonymer oder authentisierter Angreifer kann mehrere Schwachstellen in IBM InfoSphere Information Server ausnutzen, um Dateien zu manipulieren, beliebigen Code auszuführen oder einen Denial-of-Service-Zustand zu verursachen.

Ein entfernter, anonymer Angreifer kann mehrere Schwachstellen in NetApp ActiveIQ Unified Manager ausnutzen, um einen Denial of Service Angriff durchzuführen oder Daten zu manipulieren.

Ein Angreifer kann mehrere Schwachstellen in IBM Concert ausnutzen, um beliebigen Programmcode auszuführen, um einen Denial of Service Angriff durchzuführen, um Informationen offenzulegen, um Dateien zu manipulieren, um einen Cross-Site Scripting Angriff durchzuführen, um einen SQL-Injection Angriff durchzuführen und um Sicherheitsvorkehrungen zu umgehen.

## Summary A flaw in netty's parsing of chunk extensions in HTTP/1.1 messages with chunked encoding can lead to request smuggling issues with some reverse proxies. ## Details When encountering a newline character (LF) while parsing a chunk extension, netty interprets the newline as the end of the chunk-size line regardless of whether a preceding carriage return (CR) was found. This is in violation of the HTTP 1.1 standard which specifies that the chunk extension is terminated by a CRLF sequence (see the [RFC](https://datatracker.ietf.org/doc/html/rfc9112#name-chunked-transfer-coding)). This is by itself harmless, but consider an intermediary with a similar parsing flaw: while parsing a chunk extension, the intermediary interprets an LF without a preceding CR as simply part of the chunk extension (this is also in violation of the RFC, because whitespace characters are not allowed in chunk extensions). We can use this discrepancy to construct an HTTP request that the intermediary will interpret as one request but netty will interpret as two (all lines ending with CRLF, notice the LFs in the chunk extension): ``` POST /one HTTP/1.1 Host: localhost:8080 Transfer-Encoding: chunked 48;\nAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n0 POST /two HTTP/1.1 Host: localhost:8080 Transfer-Encoding: chunked 0 ``` The intermediary will interpret this as a single request. Once forwarded to netty, netty will interpret it as two separate requests. This is a problem, because attackers can then the intermediary, as well as perform standard request smuggling attacks against other live users (see [this Portswigger article](https://portswigger.net/web-security/request-smuggling/exploiting)). ## Impact This is a request smuggling issue which can be exploited for bypassing front-end access control rules as well as corrupting the responses served to other live clients. The impact is high, but it only affects setups that use a front-end which: 1. Interprets LF characters (without preceding CR) in chunk extensions as part of the chunk extension. 2. Forwards chunk extensions without normalization. ## Disclosure - This vulnerability was disclosed on June 18th, 2025 here: https://w4ke.info/2025/06/18/funky-chunks.html ## Discussion Discussion for this vulnerability can be found here: - https://github.com/netty/netty/issues/15522 - https://github.com/JLLeitschuh/unCVEed/issues/1 ## Credit - Credit to @JeppW for uncovering this vulnerability. - Credit to @JLLeitschuh at [Socket](https://socket.dev/) for coordinating the vulnerability disclosure.