1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
|
From d3222975c7d6cda9e25809dea05241188457b113 Mon Sep 17 00:00:00 2001
From: William Bowling <will@wbowling.info>
Date: Fri, 1 Mar 2019 21:45:56 +0000
Subject: [PATCH 1/1] slirp: check sscanf result when emulating ident
MIME-Version: 1.0
Content-Type: text/plain; charset=utf8
Content-Transfer-Encoding: 8bit
When emulating ident in tcp_emu, if the strchr checks passed but the
sscanf check failed, two uninitialized variables would be copied and
sent in the reply, so move this code inside the if(sscanf()) clause.
Signed-off-by: William Bowling <will@wbowling.info>
Cc: qemu-stable@nongnu.org
Cc: secalert@redhat.com
Message-Id: <1551476756-25749-1-git-send-email-will@wbowling.info>
Signed-off-by: Samuel Thibault <samuel.thibault@ens-lyon.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Upstream-Status: Backport
https://git.qemu.org/?p=qemu.git;a=commitdiff;h=d3222975c7d6cda9e25809dea05241188457b113;hp=6c419a1e06c21c4568d5a12a9c5cafcdb00f6aa8
CVE: CVE-2019-9824
affects < 4.0.0
Signed-off-by: Armin Kuster <akuster@mvista.com>
Index: qemu-3.0.0/slirp/tcp_subr.c
===================================================================
--- qemu-3.0.0.orig/slirp/tcp_subr.c
+++ qemu-3.0.0/slirp/tcp_subr.c
@@ -662,12 +662,12 @@ tcp_emu(struct socket *so, struct mbuf *
break;
}
}
+ so_rcv->sb_cc = snprintf(so_rcv->sb_data,
+ so_rcv->sb_datalen,
+ "%d,%d\r\n", n1, n2);
+ so_rcv->sb_rptr = so_rcv->sb_data;
+ so_rcv->sb_wptr = so_rcv->sb_data + so_rcv->sb_cc;
}
- so_rcv->sb_cc = snprintf(so_rcv->sb_data,
- so_rcv->sb_datalen,
- "%d,%d\r\n", n1, n2);
- so_rcv->sb_rptr = so_rcv->sb_data;
- so_rcv->sb_wptr = so_rcv->sb_data + so_rcv->sb_cc;
}
m_free(m);
return 0;
|
