GHSA-xpw8-rcwv-8f8p io.netty:netty-codec-http2 vulnerable to HTTP/2 Rapid Reset Attack
Attackers can cause denial of service on HTTP/2 servers by sending frequent RST frames, requiring library upgrades to mitigate.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is GHSA-xpw8-rcwv-8f8p?
GHSA-xpw8-rcwv-8f8p is a denial of service vulnerability in io.netty:netty-codec-http2, published on 10 Oct 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A client might overload the server by issue frequent RST frames. This can cause a massive amount of load on the remote system and so cause a DDOS attack.
Impact
This is a DDOS attack, any http2 server is affected and so you should update as soon as possible.
Patches
This is patched in version 4.1.100.Final.
Workarounds
A user can limit the amount of RST frames that are accepted per connection over a timeframe manually using either an own Http2FrameListener implementation or an ChannelInboundHandler implementation (depending which http2 API is used).
References
Which versions are affected by GHSA-xpw8-rcwv-8f8p?
2 open source packages ship an affected version, including io.netty:netty-codec-http2.
| Package | Affected | Fixed in |
|---|---|---|
io.netty:netty-codec-http2 Maven | All versions | 4.1.100.Final |
io.netty:netty-codec-http2 Maven | All versions | 4.1.100.Final |
How do I fix GHSA-xpw8-rcwv-8f8p?
Upgrade io.netty:netty-codec-http2 to 4.1.100.Final or later.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is GHSA-xpw8-rcwv-8f8p being exploited?
There is no known exploitation of GHSA-xpw8-rcwv-8f8p in the wild and no public exploit code.