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RHEL-159542 CVE-2026-27784 nginx: NGINX: Denial of Service due to memory corruption via crafted MP4 file

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Resolves: RHEL-159542

rh-pre-commit.version: 2.3.2
rh-pre-commit.check-secrets: ENABLED
This commit is contained in:
pdancak 2026-04-14 12:06:22 +02:00
parent 6f618941b5
commit 8bdb892b28
2 changed files with 90 additions and 0 deletions
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84
0017-Mp4-fixed-possible-integer-overflow-on-32-bit-platfo.patch Normal file
View File

@ -0,0 +1,84 @@
From 3568812cf98dfd7661cd7516ecf9b398c134ab3c Mon Sep 17 00:00:00 2001
From: Roman Arutyunyan <arut@nginx.com>
Date: Mon, 2 Mar 2026 21:12:34 +0400
Subject: [PATCH] Mp4: fixed possible integer overflow on 32-bit platforms.
Previously, a 32-bit overflow could happen while validating atom entries
count. This allowed processing of an invalid atom with entrires beyond
its boundaries with reads and writes outside of the allocated mp4 buffer.
Reported by Prabhav Srinath (sprabhav7).
---
src/http/modules/ngx_http_mp4_module.c | 14 +++++++-------
1 file changed, 7 insertions(+), 7 deletions(-)
diff --git a/src/http/modules/ngx_http_mp4_module.c b/src/http/modules/ngx_http_mp4_module.c
index 173d8ad54..678d6296c 100644
--- a/src/http/modules/ngx_http_mp4_module.c
+++ b/src/http/modules/ngx_http_mp4_module.c
@@ -2297,7 +2297,7 @@ ngx_http_mp4_read_stts_atom(ngx_http_mp4_file_t *mp4, uint64_t atom_data_size)
"mp4 time-to-sample entries:%uD", entries);
if (ngx_mp4_atom_data_size(ngx_mp4_stts_atom_t)
- + entries * sizeof(ngx_mp4_stts_entry_t) > atom_data_size)
+ + (uint64_t) entries * sizeof(ngx_mp4_stts_entry_t) > atom_data_size)
{
ngx_log_error(NGX_LOG_ERR, mp4->file.log, 0,
"\"%s\" mp4 stts atom too small", mp4->file.name.data);
@@ -2612,7 +2612,7 @@ ngx_http_mp4_read_stss_atom(ngx_http_mp4_file_t *mp4, uint64_t atom_data_size)
atom->last = atom_table;
if (ngx_mp4_atom_data_size(ngx_http_mp4_stss_atom_t)
- + entries * sizeof(uint32_t) > atom_data_size)
+ + (uint64_t) entries * sizeof(uint32_t) > atom_data_size)
{
ngx_log_error(NGX_LOG_ERR, mp4->file.log, 0,
"\"%s\" mp4 stss atom too small", mp4->file.name.data);
@@ -2817,7 +2817,7 @@ ngx_http_mp4_read_ctts_atom(ngx_http_mp4_file_t *mp4, uint64_t atom_data_size)
atom->last = atom_table;
if (ngx_mp4_atom_data_size(ngx_mp4_ctts_atom_t)
- + entries * sizeof(ngx_mp4_ctts_entry_t) > atom_data_size)
+ + (uint64_t) entries * sizeof(ngx_mp4_ctts_entry_t) > atom_data_size)
{
ngx_log_error(NGX_LOG_ERR, mp4->file.log, 0,
"\"%s\" mp4 ctts atom too small", mp4->file.name.data);
@@ -2999,7 +2999,7 @@ ngx_http_mp4_read_stsc_atom(ngx_http_mp4_file_t *mp4, uint64_t atom_data_size)
"sample-to-chunk entries:%uD", entries);
if (ngx_mp4_atom_data_size(ngx_mp4_stsc_atom_t)
- + entries * sizeof(ngx_mp4_stsc_entry_t) > atom_data_size)
+ + (uint64_t) entries * sizeof(ngx_mp4_stsc_entry_t) > atom_data_size)
{
ngx_log_error(NGX_LOG_ERR, mp4->file.log, 0,
"\"%s\" mp4 stsc atom too small", mp4->file.name.data);
@@ -3393,7 +3393,7 @@ ngx_http_mp4_read_stsz_atom(ngx_http_mp4_file_t *mp4, uint64_t atom_data_size)
if (size == 0) {
if (ngx_mp4_atom_data_size(ngx_mp4_stsz_atom_t)
- + entries * sizeof(uint32_t) > atom_data_size)
+ + (uint64_t) entries * sizeof(uint32_t) > atom_data_size)
{
ngx_log_error(NGX_LOG_ERR, mp4->file.log, 0,
"\"%s\" mp4 stsz atom too small",
@@ -3552,7 +3552,7 @@ ngx_http_mp4_read_stco_atom(ngx_http_mp4_file_t *mp4, uint64_t atom_data_size)
ngx_log_debug1(NGX_LOG_DEBUG_HTTP, mp4->file.log, 0, "chunks:%uD", entries);
if (ngx_mp4_atom_data_size(ngx_mp4_stco_atom_t)
- + entries * sizeof(uint32_t) > atom_data_size)
+ + (uint64_t) entries * sizeof(uint32_t) > atom_data_size)
{
ngx_log_error(NGX_LOG_ERR, mp4->file.log, 0,
"\"%s\" mp4 stco atom too small", mp4->file.name.data);
@@ -3768,7 +3768,7 @@ ngx_http_mp4_read_co64_atom(ngx_http_mp4_file_t *mp4, uint64_t atom_data_size)
ngx_log_debug1(NGX_LOG_DEBUG_HTTP, mp4->file.log, 0, "chunks:%uD", entries);
if (ngx_mp4_atom_data_size(ngx_mp4_co64_atom_t)
- + entries * sizeof(uint64_t) > atom_data_size)
+ + (uint64_t) entries * sizeof(uint64_t) > atom_data_size)
{
ngx_log_error(NGX_LOG_ERR, mp4->file.log, 0,
"\"%s\" mp4 co64 atom too small", mp4->file.name.data);
--
2.53.0

6
nginx.spec
View File

@ -128,6 +128,10 @@ Patch15: 0015-Upstream-detect-premature-plain-text-response-from-S.pat
# whitespace were removed from the patch
Patch16: 0016-Dav-destination-length-validation-for-COPY-and-MOVE.patch
# https://redhat.atlassian.net/browse/RHEL-159542
# upstream patch - https://github.com/nginx/nginx/commit/3568812cf98df
Patch17: 0017-Mp4-fixed-possible-integer-overflow-on-32-bit-platfo.patch
BuildRequires: make
BuildRequires: gcc
BuildRequires: gnupg2
@ -647,6 +651,8 @@ fi
* Tue Apr 14 2026 Petr Dancak <pdancak@redhat.com> - 2:1.20.1-29
- Resolves: RHEL-159563 - CVE-2026-27654 nginx: NGINX: Denial of Service
or file modification via buffer overflow in ngx_http_dav_module
- Resolves: RHEL-159542 - CVE-2026-27784 nginx: NGINX: Denial of Service
due to memory corruption via crafted MP4 file
* 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