CVE-2023-34462: Allocation of Resources Without Limits or Throttling
(updated )
Netty is an asynchronous event-driven network application framework for rapid development of maintainable high performance protocol servers & clients. The SniHandler
can allocate up to 16MB of heap for each channel during the TLS handshake. When the handler or the channel does not have an idle timeout, it can be used to make a TCP server using the SniHandler
to allocate 16MB of heap. The SniHandler
class is a handler that waits for the TLS handshake to configure a SslHandler
according to the indicated server name by the ClientHello
record. For this matter it allocates a ByteBuf
using the value defined in the ClientHello
record. Normally the value of the packet should be smaller than the handshake packet but there are not checks done here and the way the code is written, it is possible to craft a packet that makes the SslClientHelloHandler
. This vulnerability has been fixed in version 4.1.94.Final.
References
Detect and mitigate CVE-2023-34462 with GitLab Dependency Scanning
Secure your software supply chain by verifying that all open source dependencies used in your projects contain no disclosed vulnerabilities. Learn more about Dependency Scanning →