Debian 11 & 12: DSA-5558-1 Critical: Netty Denial Of Service

Two security vulnerabilities have been discovered in Netty, a Java NIO
client/server socket framework.

CVE-2023-34462

It might be possible for a remote peer to send a client hello packet during
a TLS handshake which lead the server to buffer up to 16 MB of data per
connection. This could lead to a OutOfMemoryError and so result in a denial
of service.

CVE-2023-44487

The HTTP/2 protocol allowed a denial of service (server resource
consumption) because request cancellation can reset many streams quickly.
This problem is also known as Rapid Reset Attack.

For the oldstable distribution (bullseye), these problems have been fixed
in version 1:4.1.48-4+deb11u2.

For the stable distribution (bookworm), these problems have been fixed in
version 1:4.1.48-7+deb12u1.

We recommend that you upgrade your netty packages.

For the detailed security status of netty please refer to
its security tracker page at:
https://security-tracker.debian.org/tracker/source-package/netty

Further information...