Package: spice / 0.12.8-2.1+deb9u3

CVE-2016-9577-and-CVE-2016-9578.patch Patch series | download
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From: Markus Koschany <apo@debian.org>
Date: Mon, 13 Feb 2017 21:38:02 +0100
Subject: CVE-2016-9577 and CVE-2016-9578

Bug-Debian: https://bugs.debian.org/854336
Origin: http://pkgs.fedoraproject.org/cgit/rpms/spice.git/commit/?id=d919d639ae5f83a9735a04d843eed675f9357c0d
---
 server/main_channel.c |  3 +++
 server/reds.c         | 11 ++++++++++-
 2 files changed, 13 insertions(+), 1 deletion(-)

diff --git a/server/main_channel.c b/server/main_channel.c
index 0ecc9df..1fc3915 100644
--- a/server/main_channel.c
+++ b/server/main_channel.c
@@ -1026,6 +1026,9 @@ static uint8_t *main_channel_alloc_msg_rcv_buf(RedChannelClient *rcc,
 
     if (type == SPICE_MSGC_MAIN_AGENT_DATA) {
         return reds_get_agent_data_buffer(mcc, size);
+    } else if (size > sizeof(main_chan->recv_buf)) {
+        /* message too large, caller will log a message and close the connection */
+        return NULL;
     } else {
         return main_chan->recv_buf;
     }
diff --git a/server/reds.c b/server/reds.c
index 61bf735..4c60f58 100644
--- a/server/reds.c
+++ b/server/reds.c
@@ -2110,6 +2110,14 @@ static void reds_handle_read_link_done(void *opaque)
     link_mess->num_channel_caps = GUINT32_FROM_LE(link_mess->num_channel_caps);
     link_mess->num_common_caps = GUINT32_FROM_LE(link_mess->num_common_caps);
 
+    /* Prevent DoS. Currently we defined only 13 capabilities,
+     * I expect 1024 to be valid for quite a lot time */
+    if (link_mess->num_channel_caps > 1024 || link_mess->num_common_caps > 1024) {
+        reds_send_link_error(link, SPICE_LINK_ERR_INVALID_DATA);
+        reds_link_free(link);
+        return;
+    }
+
     num_caps = link_mess->num_common_caps + link_mess->num_channel_caps;
     caps = (uint32_t *)((uint8_t *)link_mess + link_mess->caps_offset);
 
@@ -2202,7 +2210,8 @@ static void reds_handle_read_header_done(void *opaque)
 
     reds->peer_minor_version = header->minor_version;
 
-    if (header->size < sizeof(SpiceLinkMess)) {
+    /* the check for 4096 is to avoid clients to cause arbitrary big memory allocations */
+    if (header->size < sizeof(SpiceLinkMess) || header->size > 4096) {
         reds_send_link_error(link, SPICE_LINK_ERR_INVALID_DATA);
         spice_warning("bad size %u", header->size);
         reds_link_free(link);