51 lines
1.9 KiB
Diff
51 lines
1.9 KiB
Diff
|
From d26f1025d0a0a6c602d758a2e0917759492473e9 Mon Sep 17 00:00:00 2001
|
||
|
|
From: Daniel Gustafsson <daniel@yesql.se>
|
||
|
|
Date: Sat, 19 Jan 2019 00:42:47 +0100
|
||
|
|
Subject: [PATCH] smtp: avoid risk of buffer overflow in strtol
|
||
|
|
|
||
|
|
If the incoming len 5, but the buffer does not have a termination
|
||
|
|
after 5 bytes, the strtol() call may keep reading through the line
|
||
|
|
buffer until is exceeds its boundary. Fix by ensuring that we are
|
||
|
|
using a bounded read with a temporary buffer on the stack.
|
||
|
|
|
||
|
|
Bug: https://curl.haxx.se/docs/CVE-2019-3823.html
|
||
|
|
Reported-by: Brian Carpenter (Geeknik Labs)
|
||
|
|
CVE-2019-3823
|
||
|
|
|
||
|
|
Upstream-commit: 39df4073e5413fcdbb5a38da0c1ce6f1c0ceb484
|
||
|
|
Signed-off-by: Kamil Dudka <kdudka@redhat.com>
|
||
|
|
---
|
||
|
|
lib/smtp.c | 8 ++++++--
|
||
|
|
1 file changed, 6 insertions(+), 2 deletions(-)
|
||
|
|
|
||
|
|
diff --git a/lib/smtp.c b/lib/smtp.c
|
||
|
|
index ecf10a4..1b9f92d 100644
|
||
|
|
--- a/lib/smtp.c
|
||
|
|
+++ b/lib/smtp.c
|
||
|
|
@@ -5,7 +5,7 @@
|
||
|
|
* | (__| |_| | _ <| |___
|
||
|
|
* \___|\___/|_| \_\_____|
|
||
|
|
*
|
||
|
|
- * Copyright (C) 1998 - 2018, Daniel Stenberg, <daniel@haxx.se>, et al.
|
||
|
|
+ * Copyright (C) 1998 - 2019, Daniel Stenberg, <daniel@haxx.se>, et al.
|
||
|
|
*
|
||
|
|
* This software is licensed as described in the file COPYING, which
|
||
|
|
* you should have received as part of this distribution. The terms
|
||
|
|
@@ -207,8 +207,12 @@ static bool smtp_endofresp(struct connectdata *conn, char *line, size_t len,
|
||
|
|
Section 4. Examples of RFC-4954 but some e-mail servers ignore this and
|
||
|
|
only send the response code instead as per Section 4.2. */
|
||
|
|
if(line[3] == ' ' || len == 5) {
|
||
|
|
+ char tmpline[6];
|
||
|
|
+
|
||
|
|
result = TRUE;
|
||
|
|
- *resp = curlx_sltosi(strtol(line, NULL, 10));
|
||
|
|
+ memset(tmpline, '\0', sizeof(tmpline));
|
||
|
|
+ memcpy(tmpline, line, (len == 5 ? 5 : 3));
|
||
|
|
+ *resp = curlx_sltosi(strtol(tmpline, NULL, 10));
|
||
|
|
|
||
|
|
/* Make sure real server never sends internal value */
|
||
|
|
if(*resp == 1)
|
||
|
|
--
|
||
|
|
2.17.2
|
||
|
|
|