CVE-2022-41881

Netty project is an event-driven asynchronous network application framework. In versions prior to 4.1.86.Final, a StackOverflowError can be raised when parsing a malformed crafted message due to an infinite recursion. This issue is patched in version 4.1.86.Final. There is no workaround, except using a custom HaProxyMessageDecoder.

Netty project is an event-driven asynchronous network application framework. In versions prior to 4.1.86.Final, a StackOverflowError can be raised when parsing a malformed crafted message due to an infinite recursion. This issue is patched in version 4.1.86.Final. There is no workaround, except using a custom HaProxyMessageDecoder.

### Impact A StackOverflowError can be raised when parsing a malformed crafted message due to an infinite recursion. ### Patches Users should upgrade to 4.1.86.Final. ### Workarounds There is no workaround, except using a custom HaProxyMessageDecoder. ### References When parsing a TLV with type = PP2_TYPE_SSL, the value can be again a TLV with type = PP2_TYPE_SSL and so on. The only limitation of the recursion is that the TLV length cannot be bigger than 0xffff because it is encoded in an unsigned short type. Providing a TLV with a nesting level that is large enough will lead to raising of a StackOverflowError. The StackOverflowError will be caught if HAProxyMessageDecoder is used as part of Netty’s ChannelPipeline, but using it directly without the ChannelPipeline will lead to a thrown exception / crash. ### For more information If you have any questions or comments about this advisory: * Open an issue in [netty](https://github.com/netty/netty)

### Impact A StackOverflowError can be raised when parsing a malformed crafted message due to an infinite recursion. ### Patches Users should upgrade to 4.1.86.Final. ### Workarounds There is no workaround, except using a custom HaProxyMessageDecoder. ### References When parsing a TLV with type = PP2_TYPE_SSL, the value can be again a TLV with type = PP2_TYPE_SSL and so on. The only limitation of the recursion is that the TLV length cannot be bigger than 0xffff because it is encoded in an unsigned short type. Providing a TLV with a nesting level that is large enough will lead to raising of a StackOverflowError. The StackOverflowError will be caught if HAProxyMessageDecoder is used as part of Netty’s ChannelPipeline, but using it directly without the ChannelPipeline will lead to a thrown exception / crash. ### For more information If you have any questions or comments about this advisory: * Open an issue in [netty](https://github.com/netty/netty)

El proyecto Netty es un framework de aplicación de red asíncrona impulsado por eventos. En versiones anteriores a la 4.1.86.Final, se puede generar un StackOverflowError al analizar un mensaje manipulado con formato incorrecto debido a una recursividad infinita. Este problema se solucionó en la versión 4.1.86.Final. No existe ningún workaround, excepto utilizar un HaProxyMessageDecoder personalizado.