http2: allow security revert for Ping/Settings Flood

nghttp2 has updated its limit for outstanding Ping/Settings ACKs to 1000. This commit allows reverting to the old default of 10000. The associated CVEs are CVE-2019-9512/CVE-2019-9515. Backport-PR-URL: #29123 PR-URL: #29122 Reviewed-By: Rich Trott <[email protected]> Reviewed-By: James M Snell <[email protected]>
nodejs · Aug 15, 2019 · 0acbe05 · 0acbe05
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commit 0acbe05
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diff --git a/src/node_http2.cc b/src/node_http2.cc
@@ -152,6 +152,9 @@ Http2Options::Http2Options(Environment* env, nghttp2_session_type type) {
         buffer[IDX_OPTIONS_PEER_MAX_CONCURRENT_STREAMS]);
   }
 
+  if (IsReverted(SECURITY_REVERT_CVE_2019_9512))
+    nghttp2_option_set_max_outbound_ack(options_, 10000);
+
   // The padding strategy sets the mechanism by which we determine how much
   // additional frame padding to apply to DATA and HEADERS frames. Currently
   // this is set on a per-session basis, but eventually we may switch to

diff --git a/src/node_revert.h b/src/node_revert.h
@@ -16,6 +16,7 @@
 namespace node {
 
 #define SECURITY_REVERSIONS(XX)                                            \
+  XX(CVE_2019_9512, "CVE-2019-9512", "HTTP/2 Ping/Settings Flood")         \
   XX(CVE_2019_9514, "CVE-2019-9514", "HTTP/2 Reset Flood")                 \
   XX(CVE_2019_9516, "CVE-2019-9516", "HTTP/2 0-Length Headers Leak")       \
   XX(CVE_2019_9518, "CVE-2019-9518", "HTTP/2 Empty DATA Frame Flooding")   \