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From: Milan Crha <mcrha@redhat.com>
Date: Tue, 15 Apr 2025 09:03:00 +0200
Subject: multipart: Fix read out of buffer bounds under
soup_multipart_new_from_message()
This is CVE-2025-32914, special crafted input can cause read out of buffer bounds
of the body argument.
Closes #436
(cherry picked from commit 5bfcf8157597f2d327050114fb37ff600004dbcf)
Tests backporting forward-ported from bullseye work by Andreas Henriksson.
---
libsoup/soup-multipart.c | 2 +-
tests/multipart-test.c | 58 ++++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 59 insertions(+), 1 deletion(-)
diff --git a/libsoup/soup-multipart.c b/libsoup/soup-multipart.c
index a7e550f..dd93973 100644
--- a/libsoup/soup-multipart.c
+++ b/libsoup/soup-multipart.c
@@ -181,7 +181,7 @@ soup_multipart_new_from_message (SoupMessageHeaders *headers,
return NULL;
}
- split = strstr (start, "\r\n\r\n");
+ split = g_strstr_len (start, body_end - start, "\r\n\r\n");
if (!split || split > end) {
soup_multipart_free (multipart);
soup_buffer_free (flattened);
diff --git a/tests/multipart-test.c b/tests/multipart-test.c
index 64a5ebf..c46b320 100644
--- a/tests/multipart-test.c
+++ b/tests/multipart-test.c
@@ -479,6 +479,62 @@ test_multipart (gconstpointer data)
g_main_loop_unref (loop);
}
+static void
+test_multipart_bounds_good (void)
+{
+ #define TEXT "line1\r\nline2"
+ SoupMultipart *multipart;
+ SoupMessageHeaders *headers, *set_headers = NULL;
+ GBytes *bytes, *set_bytes = NULL;
+ const char *raw_data = "--123\r\nContent-Type: text/plain;\r\n\r\n" TEXT "\r\n--123--\r\n";
+ gboolean success;
+
+ headers = soup_message_headers_new (SOUP_MESSAGE_HEADERS_MULTIPART);
+ soup_message_headers_append (headers, "Content-Type", "multipart/mixed; boundary=\"123\"");
+
+ bytes = g_bytes_new (raw_data, strlen (raw_data));
+
+ multipart = soup_multipart_new_from_message (headers, bytes);
+
+ g_assert_nonnull (multipart);
+ g_assert_cmpint (soup_multipart_get_length (multipart), ==, 1);
+ success = soup_multipart_get_part (multipart, 0, &set_headers, &set_bytes);
+ g_assert_true (success);
+ g_assert_nonnull (set_headers);
+ g_assert_nonnull (set_bytes);
+ g_assert_cmpint (strlen (TEXT), ==, g_bytes_get_size (set_bytes));
+ g_assert_cmpstr ("text/plain", ==, soup_message_headers_get_content_type (set_headers, NULL));
+ g_assert_cmpmem (TEXT, strlen (TEXT), g_bytes_get_data (set_bytes, NULL), g_bytes_get_size (set_bytes));
+
+ soup_message_headers_unref (headers);
+ g_bytes_unref (bytes);
+
+ soup_multipart_free (multipart);
+
+ #undef TEXT
+}
+
+static void
+test_multipart_bounds_bad (void)
+{
+ SoupMultipart *multipart;
+ SoupMessageHeaders *headers;
+ GBytes *bytes;
+ const char *raw_data = "--123\r\nContent-Type: text/plain;\r\nline1\r\nline2\r\n--123--\r\n";
+
+ headers = soup_message_headers_new (SOUP_MESSAGE_HEADERS_MULTIPART);
+ soup_message_headers_append (headers, "Content-Type", "multipart/mixed; boundary=\"123\"");
+
+ bytes = g_bytes_new (raw_data, strlen (raw_data));
+
+ /* it did read out of raw_data/bytes bounds */
+ multipart = soup_multipart_new_from_message (headers, bytes);
+ g_assert_null (multipart);
+
+ soup_message_headers_unref (headers);
+ g_bytes_unref (bytes);
+}
+
int
main (int argc, char **argv)
{
@@ -508,6 +564,8 @@ main (int argc, char **argv)
g_test_add_data_func ("/multipart/sync", GINT_TO_POINTER (SYNC_MULTIPART), test_multipart);
g_test_add_data_func ("/multipart/async", GINT_TO_POINTER (ASYNC_MULTIPART), test_multipart);
g_test_add_data_func ("/multipart/async-small-reads", GINT_TO_POINTER (ASYNC_MULTIPART_SMALL_READS), test_multipart);
+ g_test_add_func ("/multipart/bounds-good", test_multipart_bounds_good);
+ g_test_add_func ("/multipart/bounds-bad", test_multipart_bounds_bad);
ret = g_test_run ();
|
