diff options
Diffstat (limited to 'gnu/packages/patches/spice-CVE-2017-7506.patch')
| -rw-r--r-- | gnu/packages/patches/spice-CVE-2017-7506.patch | 158 |
1 files changed, 0 insertions, 158 deletions
diff --git a/gnu/packages/patches/spice-CVE-2017-7506.patch b/gnu/packages/patches/spice-CVE-2017-7506.patch deleted file mode 100644 index 37d8f02831..0000000000 --- a/gnu/packages/patches/spice-CVE-2017-7506.patch +++ /dev/null @@ -1,158 +0,0 @@ -Fix CVE-2017-7506: - -https://bugzilla.redhat.com/show_bug.cgi?id=1452606 -https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-7506 - -Patches copied from Debian spice package version -'spice_0.12.8-2.1+deb9u1.debian.tar.xz': -http://security.debian.org/debian-security/pool/updates/main/s/spice/spice_0.12.8-2.1+deb9u1.debian.tar.xz - -The patches had to be adapted to apply to the latest spice tarball, and -are based on these upstream commits: - -https://cgit.freedesktop.org/spice/spice/commit/?id=111ab38611cef5012f1565a65fa2d8a8a05cce37 -https://cgit.freedesktop.org/spice/spice/commit/?id=571cec91e71c2aae0d5f439ea2d8439d0c3d75eb -https://cgit.freedesktop.org/spice/spice/commit/?id=fbbcdad773e2791cfb988f4748faa41943551ca6 - -From 257f69d619fed407493156c8a7b952abc8a51314 Mon Sep 17 00:00:00 2001 -Date: Mon, 15 May 2017 15:57:28 +0100 -Subject: [spice-server 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. - ---- - server/reds.c | 25 +++++++++++++++++++++++-- - 1 file changed, 23 insertions(+), 2 deletions(-) - -diff --git a/server/reds.c b/server/reds.c -index f439a3668..7be85fdfc 100644 ---- a/server/reds.c -+++ b/server/reds.c -@@ -993,19 +993,34 @@ 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", cmc->buffer_size); - return; - } -@@ -1013,6 +1028,12 @@ static void reds_on_main_agent_monitors_config( - spice_debug("%s: %d", __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) --- -2.13.0 -From ff2b4ef70181087d5abd50bad76d026ec5088a93 Mon Sep 17 00:00:00 2001 -Date: Mon, 15 May 2017 15:57:28 +0100 -Subject: [spice-server 2/3] reds: Avoid integer overflows handling monitor - configuration - -Avoid VDAgentMessage::size integer overflows. - ---- - server/reds.c | 3 +++ - 1 file changed, 3 insertions(+) - -diff --git a/server/reds.c b/server/reds.c -index 7be85fdfc..e1c8c1086 100644 ---- a/server/reds.c -+++ b/server/reds.c -@@ -1024,6 +1024,9 @@ static void reds_on_main_agent_monitors_config( - spice_debug("not enough data yet. %d", cmc->buffer_size); - return; - } -+ if (msg_header->size < sizeof(VDAgentMonitorsConfig)) { -+ goto overflow; -+ } - monitors_config = (VDAgentMonitorsConfig *)(cmc->buffer + sizeof(*msg_header)); - spice_debug("%s: %d", __func__, monitors_config->num_of_monitors); - red_dispatcher_client_monitors_config(monitors_config); --- -2.13.0 -From 8cc3d7df2792751939cc832f4110c57e2addfca5 Mon Sep 17 00:00:00 2001 -Date: Mon, 15 May 2017 15:57:28 +0100 -Subject: [spice-server 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. - ---- - server/reds.c | 7 +++++++ - 1 file changed, 7 insertions(+) - -diff --git a/server/reds.c b/server/reds.c -index e1c8c1086..3a42c3755 100644 ---- a/server/reds.c -+++ b/server/reds.c -@@ -1000,6 +1000,7 @@ 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 -@@ -1028,6 +1029,12 @@ 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", __func__, monitors_config->num_of_monitors); - red_dispatcher_client_monitors_config(monitors_config); - reds_client_monitors_config_cleanup(); --- -2.13.0 |