gentoo-overlay/net-misc/vino/files/CVE-2018-7225.patch

From d8a663541ef358a13fed2fbb39e7d323454369dc Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Petr=20P=C3=ADsa=C5=99?= <ppisar@redhat.com>
Date: Mon, 26 Feb 2018 13:48:00 +0100
Subject: [PATCH 2/3] Limit client cut text length to 1 MB

This patch constrains a client cut text length to 1 MB. Otherwise
a client could make server allocate 2 GB of memory and that seems to
be to much to classify it as a denial of service.

The limit also prevents from an integer overflow followed by copying
an uninitilized memory when processing msg.cct.length value larger
than SIZE_MAX or INT_MAX - sz_rfbClientCutTextMsg.

This patch also corrects accepting length value of zero (malloc(0) is
interpreted on differnet systems differently).

CVE-2018-7225
<https://github.com/LibVNC/libvncserver/issues/218>
---
 server/libvncserver/rfbserver.c | 21 ++++++++++++++++++++-
 1 file changed, 20 insertions(+), 1 deletion(-)

diff --git a/server/libvncserver/rfbserver.c b/server/libvncserver/rfbserver.c
index 2615dc3..2224edb 100644
--- a/server/libvncserver/rfbserver.c
+++ b/server/libvncserver/rfbserver.c
@@ -59,6 +59,9 @@
 #define DEBUGPROTO(x)
 #endif
 
+/* PRIu32 */
+#include <inttypes.h>
+
 rfbClientPtr pointerClient = NULL;  /* Mutex for pointer events */
 
 static void rfbProcessClientProtocolVersion(rfbClientPtr cl);
@@ -852,7 +855,23 @@ rfbProcessClientNormalMessage(rfbClientPtr cl)
 
 	msg.cct.length = Swap32IfLE(msg.cct.length);
 
-	str = (char *)malloc(msg.cct.length);
+	/* uint32_t input is passed to malloc()'s size_t argument,
+	 * to rfbReadExact()'s int argument, to rfbStatRecordMessageRcvd()'s int
+	 * argument increased of sz_rfbClientCutTextMsg, and to setXCutText()'s int
+	 * argument. Here we impose a limit of 1 MB so that the value fits
+	 * into all of the types to prevent from misinterpretation and thus
+	 * from accessing uninitialized memory (CVE-2018-7225) and also to
+	 * prevent from a denial-of-service by allocating to much memory in
+	 * the server. */
+	if (msg.cct.length > 1<<20) {
+	    rfbLog("rfbClientCutText: too big cut text length requested: %" PRIu32 "\n",
+		    msg.cct.length);
+	    rfbCloseClient(cl);
+	    return;
+	}
+
+	/* Allow zero-length client cut text. */
+	str = (char *)calloc(msg.cct.length ? msg.cct.length : 1, 1);
 	if (str == NULL) {
 		rfbLogPerror("rfbProcessClientNormalMessage: not enough memory");
 		rfbCloseClient(cl);
-- 
2.20.1