diff options
Diffstat (limited to 'recipes-support/spice/files/CVE-2017-7506-1.patch')
-rw-r--r-- | recipes-support/spice/files/CVE-2017-7506-1.patch | 81 |
1 files changed, 81 insertions, 0 deletions
diff --git a/recipes-support/spice/files/CVE-2017-7506-1.patch b/recipes-support/spice/files/CVE-2017-7506-1.patch new file mode 100644 index 0000000..1975aca --- /dev/null +++ b/recipes-support/spice/files/CVE-2017-7506-1.patch | |||
@@ -0,0 +1,81 @@ | |||
1 | From 2e521a9db27e1ed31bf5fbed437208bf7f1c77a1 Mon Sep 17 00:00:00 2001 | ||
2 | From: Frediano Ziglio <fziglio@redhat.com> | ||
3 | Date: Mon, 15 May 2017 15:57:28 +0100 | ||
4 | Subject: [PATCH 1/3] reds: Disconnect when receiving overly big | ||
5 | ClientMonitorsConfig | ||
6 | |||
7 | Total message size received from the client was unlimited. There is | ||
8 | a 2kiB size check on individual agent messages, but the MonitorsConfig | ||
9 | message can be split in multiple chunks, and the size of the | ||
10 | non-chunked MonitorsConfig message was never checked. This could easily | ||
11 | lead to memory exhaustion on the host. | ||
12 | |||
13 | Signed-off-by: Frediano Ziglio <fziglio@redhat.com> | ||
14 | |||
15 | Upstream-Status: Backport | ||
16 | [https://cgit.freedesktop.org/spice/spice/commit/?h=0.12&id=f1e7ec03e26ab6b8ca9b7ec060846a5b706a963d] | ||
17 | |||
18 | CVE: CVE-2017-7506 | ||
19 | |||
20 | Signed-off-by: Yi Zhao <yi.zhao@windriver.com> | ||
21 | --- | ||
22 | server/reds.c | 25 +++++++++++++++++++++++-- | ||
23 | 1 file changed, 23 insertions(+), 2 deletions(-) | ||
24 | |||
25 | diff --git a/server/reds.c b/server/reds.c | ||
26 | index 30d0652..701d5d8 100644 | ||
27 | --- a/server/reds.c | ||
28 | +++ b/server/reds.c | ||
29 | @@ -1086,19 +1086,34 @@ static void reds_client_monitors_config_cleanup(void) | ||
30 | static void reds_on_main_agent_monitors_config( | ||
31 | MainChannelClient *mcc, void *message, size_t size) | ||
32 | { | ||
33 | + const unsigned int MAX_MONITORS = 256; | ||
34 | + const unsigned int MAX_MONITOR_CONFIG_SIZE = | ||
35 | + sizeof(VDAgentMonitorsConfig) + MAX_MONITORS * sizeof(VDAgentMonConfig); | ||
36 | + | ||
37 | VDAgentMessage *msg_header; | ||
38 | VDAgentMonitorsConfig *monitors_config; | ||
39 | RedsClientMonitorsConfig *cmc = &reds->client_monitors_config; | ||
40 | |||
41 | + // limit size of message sent by the client as this can cause a DoS through | ||
42 | + // memory exhaustion, or potentially some integer overflows | ||
43 | + if (sizeof(VDAgentMessage) + MAX_MONITOR_CONFIG_SIZE - cmc->buffer_size < size) { | ||
44 | + goto overflow; | ||
45 | + } | ||
46 | cmc->buffer_size += size; | ||
47 | cmc->buffer = realloc(cmc->buffer, cmc->buffer_size); | ||
48 | spice_assert(cmc->buffer); | ||
49 | cmc->mcc = mcc; | ||
50 | memcpy(cmc->buffer + cmc->buffer_pos, message, size); | ||
51 | cmc->buffer_pos += size; | ||
52 | + if (sizeof(VDAgentMessage) > cmc->buffer_size) { | ||
53 | + spice_debug("not enough data yet. %d", cmc->buffer_size); | ||
54 | + return; | ||
55 | + } | ||
56 | msg_header = (VDAgentMessage *)cmc->buffer; | ||
57 | - if (sizeof(VDAgentMessage) > cmc->buffer_size || | ||
58 | - msg_header->size > cmc->buffer_size - sizeof(VDAgentMessage)) { | ||
59 | + if (msg_header->size > MAX_MONITOR_CONFIG_SIZE) { | ||
60 | + goto overflow; | ||
61 | + } | ||
62 | + if (msg_header->size > cmc->buffer_size - sizeof(VDAgentMessage)) { | ||
63 | spice_debug("not enough data yet. %d\n", cmc->buffer_size); | ||
64 | return; | ||
65 | } | ||
66 | @@ -1106,6 +1121,12 @@ static void reds_on_main_agent_monitors_config( | ||
67 | spice_debug("%s: %d\n", __func__, monitors_config->num_of_monitors); | ||
68 | red_dispatcher_client_monitors_config(monitors_config); | ||
69 | reds_client_monitors_config_cleanup(); | ||
70 | + return; | ||
71 | + | ||
72 | +overflow: | ||
73 | + spice_warning("received invalid MonitorsConfig request from client, disconnecting"); | ||
74 | + red_channel_client_disconnect(main_channel_client_get_base(mcc)); | ||
75 | + reds_client_monitors_config_cleanup(); | ||
76 | } | ||
77 | |||
78 | void reds_on_main_agent_data(MainChannelClient *mcc, void *message, size_t size) | ||
79 | -- | ||
80 | 2.7.4 | ||
81 | |||