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Resolves: RHEL-146528 - CVE-2026-1642 nginx: NGINX: Data injection via

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man-in-the-middle attack on TLS proxied connection
This commit is contained in:
Luboš Uhliarik 2026-02-17 15:30:14 +01:00
parent 730025f7b6
commit 2ec55f3e43
2 changed files with 53 additions and 1 deletions
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45
0015-Upstream-detect-premature-plain-text-response-from-S.patch Normal file
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@ -0,0 +1,45 @@
From 93ac6eae019e30fc22d2d5321acb28de549f73aa Mon Sep 17 00:00:00 2001
From: Roman Arutyunyan <arut@nginx.com>
Date: Thu, 29 Jan 2026 13:27:32 +0400
Subject: [PATCH] Upstream: detect premature plain text response from SSL
backend.
When connecting to a backend, the connection write event is triggered
first in most cases. However if a response arrives quickly enough, both
read and write events can be triggered together within the same event loop
iteration. In this case the read event handler is called first and the
write event handler is called after it.
SSL initialization for backend connections happens only in the write event
handler since SSL handshake starts with sending Client Hello. Previously,
if a backend sent a quick plain text response, it could be parsed by the
read event handler prior to starting SSL handshake on the connection.
The change adds protection against parsing such responses on SSL-enabled
connections.
---
src/http/ngx_http_upstream.c | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/src/http/ngx_http_upstream.c b/src/http/ngx_http_upstream.c
index 2ce9f21..70c3b46 100644
--- a/src/http/ngx_http_upstream.c
+++ b/src/http/ngx_http_upstream.c
@@ -2461,6 +2461,15 @@ ngx_http_upstream_process_header(ngx_http_request_t *r, ngx_http_upstream_t *u)
return;
}
+#if (NGX_HTTP_SSL)
+ if (u->ssl && c->ssl == NULL) {
+ ngx_log_error(NGX_LOG_ERR, c->log, 0,
+ "upstream prematurely sent response");
+ ngx_http_upstream_next(r, u, NGX_HTTP_UPSTREAM_FT_ERROR);
+ return;
+ }
+#endif
+
u->state->bytes_received += n;
u->buffer.last += n;
--
2.44.0

9
nginx.spec
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@ -41,7 +41,7 @@
Name: nginx
Epoch: 2
Version: 1.20.1
Release: 27%{?dist}
Release: 28%{?dist}
Summary: A high performance web server and reverse proxy server
# BSD License (two clause)
@ -119,6 +119,9 @@ Patch13: 0013-CVE-2024-7347-Buffer-overread-in-the-mp4-module.patch
# upstream patch - https://github.com/nginx/nginx/pull/1089
Patch14: 0014-Clarify-binding-behavior-of-t-option.patch
# https://issues.redhat.com/browse/RHEL-146516
# upstream patch - https://github.com/nginx/nginx/commit/784fa05025cb8cd0c770f99bc79d2794b9f85b6e
Patch15: 0015-Upstream-detect-premature-plain-text-response-from-S.patch
BuildRequires: make
BuildRequires: gcc
@ -636,6 +639,10 @@ fi
%changelog
* Tue Feb 17 2026 Luboš Uhliarik <luhliari@redhat.com> - 2:1.20.1-28
- Resolves: RHEL-146528 - CVE-2026-1642 nginx: NGINX: Data injection via
man-in-the-middle attack on TLS proxied connection
* Thu Jan 29 2026 Luboš Uhliarik <luhliari@redhat.com> - 2:1.20.1-27
- Resolves: RHEL-145177 - Clarify binding behavior of -t option