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authorYi Zhao <yi.zhao@windriver.com>2017-09-22 10:03:05 +0800
committerBruce Ashfield <bruce.ashfield@windriver.com>2017-09-29 14:36:03 -0400
commit921dca953cea111a3c579e890cf9d95a6276b7d2 (patch)
treea3dc13751a89e3910e9d384063236c2d48beec52
parent87affd0e8d235c1786b1e6230dc796db0a6824ea (diff)
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spice: fix CVE-2017-7506
CVE-2017-7506: spice versions though 0.13 are vulnerable to out-of-bounds memory access when processing specially crafted messages from authenticated attacker to the spice server resulting into crash and/or server memory leak. Reference: https://nvd.nist.gov/vuln/detail/CVE-2017-7506 Patches from: https://cgit.freedesktop.org/spice/spice/commit/?h=0.12&id=f1e7ec03e26ab6b8ca9b7ec060846a5b706a963d https://cgit.freedesktop.org/spice/spice/commit/?h=0.12&id=ec6229c79abe05d731953df5f7e9a05ec9f6df79 https://cgit.freedesktop.org/spice/spice/commit/?h=0.12&id=a957a90baf2c62d31f3547e56bba7d0e812d2331 Signed-off-by: Yi Zhao <yi.zhao@windriver.com> Signed-off-by: Bruce Ashfield <bruce.ashfield@windriver.com>
-rw-r--r--recipes-support/spice/files/CVE-2017-7506-1.patch81
-rw-r--r--recipes-support/spice/files/CVE-2017-7506-2.patch37
-rw-r--r--recipes-support/spice/files/CVE-2017-7506-3.patch54
-rw-r--r--recipes-support/spice/spice_git.bb3
4 files changed, 175 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 @@
+From 2e521a9db27e1ed31bf5fbed437208bf7f1c77a1 Mon Sep 17 00:00:00 2001
+From: Frediano Ziglio <fziglio@redhat.com>
+Date: Mon, 15 May 2017 15:57:28 +0100
+Subject: [PATCH 1/3] reds: Disconnect when receiving overly big
+ ClientMonitorsConfig
+
+Total message size received from the client was unlimited. There is
+a 2kiB size check on individual agent messages, but the MonitorsConfig
+message can be split in multiple chunks, and the size of the
+non-chunked MonitorsConfig message was never checked. This could easily
+lead to memory exhaustion on the host.
+
+Signed-off-by: Frediano Ziglio <fziglio@redhat.com>
+
+Upstream-Status: Backport
+[https://cgit.freedesktop.org/spice/spice/commit/?h=0.12&id=f1e7ec03e26ab6b8ca9b7ec060846a5b706a963d]
+
+CVE: CVE-2017-7506
+
+Signed-off-by: Yi Zhao <yi.zhao@windriver.com>
+---
+ server/reds.c | 25 +++++++++++++++++++++++--
+ 1 file changed, 23 insertions(+), 2 deletions(-)
+
+diff --git a/server/reds.c b/server/reds.c
+index 30d0652..701d5d8 100644
+--- a/server/reds.c
++++ b/server/reds.c
+@@ -1086,19 +1086,34 @@ static void reds_client_monitors_config_cleanup(void)
+ static void reds_on_main_agent_monitors_config(
+ MainChannelClient *mcc, void *message, size_t size)
+ {
++ const unsigned int MAX_MONITORS = 256;
++ const unsigned int MAX_MONITOR_CONFIG_SIZE =
++ sizeof(VDAgentMonitorsConfig) + MAX_MONITORS * sizeof(VDAgentMonConfig);
++
+ VDAgentMessage *msg_header;
+ VDAgentMonitorsConfig *monitors_config;
+ RedsClientMonitorsConfig *cmc = &reds->client_monitors_config;
+
++ // limit size of message sent by the client as this can cause a DoS through
++ // memory exhaustion, or potentially some integer overflows
++ if (sizeof(VDAgentMessage) + MAX_MONITOR_CONFIG_SIZE - cmc->buffer_size < size) {
++ goto overflow;
++ }
+ cmc->buffer_size += size;
+ cmc->buffer = realloc(cmc->buffer, cmc->buffer_size);
+ spice_assert(cmc->buffer);
+ cmc->mcc = mcc;
+ memcpy(cmc->buffer + cmc->buffer_pos, message, size);
+ cmc->buffer_pos += size;
++ if (sizeof(VDAgentMessage) > cmc->buffer_size) {
++ spice_debug("not enough data yet. %d", cmc->buffer_size);
++ return;
++ }
+ msg_header = (VDAgentMessage *)cmc->buffer;
+- if (sizeof(VDAgentMessage) > cmc->buffer_size ||
+- msg_header->size > cmc->buffer_size - sizeof(VDAgentMessage)) {
++ if (msg_header->size > MAX_MONITOR_CONFIG_SIZE) {
++ goto overflow;
++ }
++ if (msg_header->size > cmc->buffer_size - sizeof(VDAgentMessage)) {
+ spice_debug("not enough data yet. %d\n", cmc->buffer_size);
+ return;
+ }
+@@ -1106,6 +1121,12 @@ static void reds_on_main_agent_monitors_config(
+ spice_debug("%s: %d\n", __func__, monitors_config->num_of_monitors);
+ red_dispatcher_client_monitors_config(monitors_config);
+ reds_client_monitors_config_cleanup();
++ return;
++
++overflow:
++ spice_warning("received invalid MonitorsConfig request from client, disconnecting");
++ red_channel_client_disconnect(main_channel_client_get_base(mcc));
++ reds_client_monitors_config_cleanup();
+ }
+
+ void reds_on_main_agent_data(MainChannelClient *mcc, void *message, size_t size)
+--
+2.7.4
+
diff --git a/recipes-support/spice/files/CVE-2017-7506-2.patch b/recipes-support/spice/files/CVE-2017-7506-2.patch
new file mode 100644
index 0000000..a517b08
--- /dev/null
+++ b/recipes-support/spice/files/CVE-2017-7506-2.patch
@@ -0,0 +1,37 @@
+From 6934f036240753a14514a71ede8bb44af2043f24 Mon Sep 17 00:00:00 2001
+From: Frediano Ziglio <fziglio@redhat.com>
+Date: Mon, 15 May 2017 15:57:28 +0100
+Subject: [PATCH 2/3] reds: Avoid integer overflows handling monitor
+ configuration
+
+Avoid VDAgentMessage::size integer overflows.
+
+Signed-off-by: Frediano Ziglio <fziglio@redhat.com>
+
+Upstream-Status: Backport
+[https://cgit.freedesktop.org/spice/spice/commit/?h=0.12&id=ec6229c79abe05d731953df5f7e9a05ec9f6df79]
+
+CVE: CVE-2017-7506
+
+Signed-off-by: Yi Zhao <yi.zhao@windriver.com>
+---
+ server/reds.c | 3 +++
+ 1 file changed, 3 insertions(+)
+
+diff --git a/server/reds.c b/server/reds.c
+index 701d5d8..62b1164 100644
+--- a/server/reds.c
++++ b/server/reds.c
+@@ -1117,6 +1117,9 @@ static void reds_on_main_agent_monitors_config(
+ spice_debug("not enough data yet. %d\n", cmc->buffer_size);
+ return;
+ }
++ if (msg_header->size < sizeof(VDAgentMonitorsConfig)) {
++ goto overflow;
++ }
+ monitors_config = (VDAgentMonitorsConfig *)(cmc->buffer + sizeof(*msg_header));
+ spice_debug("%s: %d\n", __func__, monitors_config->num_of_monitors);
+ red_dispatcher_client_monitors_config(monitors_config);
+--
+2.7.4
+
diff --git a/recipes-support/spice/files/CVE-2017-7506-3.patch b/recipes-support/spice/files/CVE-2017-7506-3.patch
new file mode 100644
index 0000000..d55502f
--- /dev/null
+++ b/recipes-support/spice/files/CVE-2017-7506-3.patch
@@ -0,0 +1,54 @@
+From daedc2e2bb70f7cb0eafd65fd37fd73af12df770 Mon Sep 17 00:00:00 2001
+From: Frediano Ziglio <fziglio@redhat.com>
+Date: Mon, 15 May 2017 15:57:28 +0100
+Subject: [PATCH 3/3] reds: Avoid buffer overflows handling monitor
+ configuration
+
+It was also possible for a malicious client to set
+VDAgentMonitorsConfig::num_of_monitors to a number larger
+than the actual size of VDAgentMOnitorsConfig::monitors.
+This would lead to buffer overflows, which could allow the guest to
+read part of the host memory. This might cause write overflows in the
+host as well, but controlling the content of such buffers seems
+complicated.
+
+Signed-off-by: Frediano Ziglio <fziglio@redhat.com>
+
+Upstream-Status: Backport
+[https://cgit.freedesktop.org/spice/spice/commit/?h=0.12&id=a957a90baf2c62d31f3547e56bba7d0e812d2331]
+
+CVE: CVE-2017-7506
+
+Signed-off-by: Yi Zhao <yi.zhao@windriver.com>
+---
+ server/reds.c | 7 +++++++
+ 1 file changed, 7 insertions(+)
+
+diff --git a/server/reds.c b/server/reds.c
+index 62b1164..ee36dec 100644
+--- a/server/reds.c
++++ b/server/reds.c
+@@ -1093,6 +1093,7 @@ static void reds_on_main_agent_monitors_config(
+ VDAgentMessage *msg_header;
+ VDAgentMonitorsConfig *monitors_config;
+ RedsClientMonitorsConfig *cmc = &reds->client_monitors_config;
++ uint32_t max_monitors;
+
+ // limit size of message sent by the client as this can cause a DoS through
+ // memory exhaustion, or potentially some integer overflows
+@@ -1121,6 +1122,12 @@ static void reds_on_main_agent_monitors_config(
+ goto overflow;
+ }
+ monitors_config = (VDAgentMonitorsConfig *)(cmc->buffer + sizeof(*msg_header));
++ // limit the monitor number to avoid buffer overflows
++ max_monitors = (msg_header->size - sizeof(VDAgentMonitorsConfig)) /
++ sizeof(VDAgentMonConfig);
++ if (monitors_config->num_of_monitors > max_monitors) {
++ goto overflow;
++ }
+ spice_debug("%s: %d\n", __func__, monitors_config->num_of_monitors);
+ red_dispatcher_client_monitors_config(monitors_config);
+ reds_client_monitors_config_cleanup();
+--
+2.7.4
+
diff --git a/recipes-support/spice/spice_git.bb b/recipes-support/spice/spice_git.bb
index 04e7a25..c0fdd9c 100644
--- a/recipes-support/spice/spice_git.bb
+++ b/recipes-support/spice/spice_git.bb
@@ -38,6 +38,9 @@ SRC_URI += " \
file://0001-red_parse_qxl-Fix-BITMAP_FMT_IS_RGB-defined-but-not-.patch \
file://0001-Use-PRI-macros-in-printf-to-keep-compatibility-betwe.patch \
file://Fix-build-issues-with-gcc-7.patch \
+ file://CVE-2017-7506-1.patch \
+ file://CVE-2017-7506-2.patch \
+ file://CVE-2017-7506-3.patch \
"
S = "${WORKDIR}/git"