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fix(patches): apply Nginx patch for detecting HTTP/2 stream reset att…
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…acks early (CVE-2023-44487)

From nginx/nginx@6ceef19
---------

Signed-off-by: Aapo Talvensaari <[email protected]>
Co-authored-by: chronolaw <[email protected]>
Co-authored-by: Datong Sun <[email protected]>
(cherry picked from commit c54eddd)
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windmgc committed Oct 12, 2023
1 parent 0b47e24 commit 36a63e0
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Showing 2 changed files with 56 additions and 0 deletions.
Original file line number Diff line number Diff line change
@@ -0,0 +1,53 @@
diff --git a/bundle/nginx-1.21.4/src/http/v2/ngx_http_v2.c b/bundle/nginx-1.21.4/src/http/v2/ngx_http_v2.c
index 3afa8b6..228b060 100644
--- a/bundle/nginx-1.21.4/src/http/v2/ngx_http_v2.c
+++ b/bundle/nginx-1.21.4/src/http/v2/ngx_http_v2.c
@@ -361,6 +361,7 @@ ngx_http_v2_read_handler(ngx_event_t *rev)
ngx_log_debug0(NGX_LOG_DEBUG_HTTP, c->log, 0, "http2 read handler");

h2c->blocked = 1;
+ h2c->new_streams = 0;

if (c->close) {
c->close = 0;
@@ -1321,6 +1322,14 @@ ngx_http_v2_state_headers(ngx_http_v2_connection_t *h2c, u_char *pos,
goto rst_stream;
}

+ if (h2c->new_streams++ >= 2 * h2scf->concurrent_streams) {
+ ngx_log_error(NGX_LOG_INFO, h2c->connection->log, 0,
+ "client sent too many streams at once");
+
+ status = NGX_HTTP_V2_REFUSED_STREAM;
+ goto rst_stream;
+ }
+
if (!h2c->settings_ack
&& !(h2c->state.flags & NGX_HTTP_V2_END_STREAM_FLAG)
&& h2scf->preread_size < NGX_HTTP_V2_DEFAULT_WINDOW)
@@ -1386,6 +1395,12 @@ ngx_http_v2_state_headers(ngx_http_v2_connection_t *h2c, u_char *pos,

rst_stream:

+ if (h2c->refused_streams++ > ngx_max(h2scf->concurrent_streams, 100)) {
+ ngx_log_error(NGX_LOG_INFO, h2c->connection->log, 0,
+ "client sent too many refused streams");
+ return ngx_http_v2_connection_error(h2c, NGX_HTTP_V2_NO_ERROR);
+ }
+
if (ngx_http_v2_send_rst_stream(h2c, h2c->state.sid, status) != NGX_OK) {
return ngx_http_v2_connection_error(h2c, NGX_HTTP_V2_INTERNAL_ERROR);
}
diff --git a/bundle/nginx-1.21.4/src/http/v2/ngx_http_v2.h b/bundle/nginx-1.21.4/src/http/v2/ngx_http_v2.h
index 0eceae3..aef40bb 100644
--- a/bundle/nginx-1.21.4/src/http/v2/ngx_http_v2.h
+++ b/bundle/nginx-1.21.4/src/http/v2/ngx_http_v2.h
@@ -124,6 +124,8 @@ struct ngx_http_v2_connection_s {
ngx_uint_t processing;
ngx_uint_t frames;
ngx_uint_t idle;
+ ngx_uint_t new_streams;
+ ngx_uint_t refused_streams;
ngx_uint_t priority_limit;

ngx_uint_t pushing;
3 changes: 3 additions & 0 deletions changelog/unreleased/kong/fix-cve-2023-44487.yml
Original file line number Diff line number Diff line change
@@ -0,0 +1,3 @@
message: Apply Nginx patch for detecting HTTP/2 stream reset attacks early (CVE-2023-44487)
type: bugfix
scope: Core

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