From 66dbcd37f5b53843ae5cff004ba47b1bdd5c6e64 Mon Sep 17 00:00:00 2001
From: Sean McArthur <sean@seanmonstar.com>
Date: Wed, 3 Apr 2024 14:22:17 -0400
Subject: [PATCH] h2: continuation flood cause degradation of service (#1930)

---
 crates/h2/RUSTSEC-0000-0000.md | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)
 create mode 100644 crates/h2/RUSTSEC-0000-0000.md

diff --git a/crates/h2/RUSTSEC-0000-0000.md b/crates/h2/RUSTSEC-0000-0000.md
new file mode 100644
index 0000000..34eaecc
--- /dev/null
+++ b/crates/h2/RUSTSEC-0000-0000.md
@@ -0,0 +1,24 @@
+```toml
+[advisory]
+id = "RUSTSEC-0000-0000"
+package = "h2"
+date = "2024-04-03"
+references = ["https://seanmonstar.com/blog/hyper-http2-continuation-flood/"]
+categories = ["denial-of-service"]
+keywords = ["http", "http2", "h2"]
+
+[versions]
+patched = ["^0.3.26", ">= 0.4.4"]
+```
+
+# Degradation of service in h2 servers with CONTINUATION Flood
+
+An attacker can send a flood of CONTINUATION frames, causing `h2` to process them indefinitely.
+This results in an increase in CPU usage.
+
+Tokio task budget helps prevent this from a complete denial-of-service, as the server can still
+respond to legitimate requests, albeit with increased latency.
+
+More details at "https://seanmonstar.com/blog/hyper-http2-continuation-flood/.
+
+Patches available for 0.4.x and 0.3.x versions.