ui/vnc: limit client_cut_text msg payload size

currently a malicious client could define a payload
size of 2^32 - 1 bytes and send up to that size of
data to the vnc server. The server would allocated
that amount of memory which could easily create an
out of memory condition.

This patch limits the payload size to 1MB max.

Please note that client_cut_text messages are currently
silently ignored.

Signed-off-by: Peter Lieven <pl@kamp.de>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>

diff --git a/ui/vnc.c b/ui/vnc.c
index 14a86c36ce6625e66e52cc9728bafa5f24a0e530..19ce988f5509c4fc4d98e50879c8555d78fd6022 100644 (file)
--- a/ui/vnc.c
+++ b/ui/vnc.c
@@ -2165,13 +2165,20 @@ static int protocol_client_msg(VncState *vs, uint8_t *data, size_t len)
         pointer_event(vs, read_u8(data, 1), read_u16(data, 2), read_u16(data, 4));
         break;
     case VNC_MSG_CLIENT_CUT_TEXT:
-        if (len == 1)
+        if (len == 1) {
             return 8;
-
+        }
         if (len == 8) {
             uint32_t dlen = read_u32(data, 4);
-            if (dlen > 0)
+            if (dlen > (1 << 20)) {
+                error_report("vnc: client_cut_text msg payload has %u bytes"
+                             " which exceeds our limit of 1MB.", dlen);
+                vnc_client_error(vs);
+                break;
+            }
+            if (dlen > 0) {
                 return 8 + dlen;
+            }
         }
 
         client_cut_text(vs, read_u32(data, 4), data + 8);