busybox1.24.1: Fix CVE-2016-6301

[No upstream tracking] -- https://bugzilla.redhat.com/show_bug.cgi?id=1363710

ntpd: NTP server denial of service flaw

The busybox NTP implementation doesn't check the NTP mode of packets
received on the server port and responds to any packet with the right
size. This includes responses from another NTP server. An attacker can
send a packet with a spoofed source address in order to create an
infinite loop of responses between two busybox NTP servers. Adding
more packets to the loop increases the traffic between the servers
until one of them has a fully loaded CPU and/or network.

Upstream-Status: Backport [https://git.busybox.net/busybox/commit/?id=150dc7a2b483b8338a3e185c478b4b23ee884e71]
CVE: CVE-2016-6301
Signed-off-by: Andrej Valek <andrej.valek@siemens.com>
Signed-off-by: Pascal Bach <pascal.bach@siemens.com>

diff --git a/networking/ntpd.c b/networking/ntpd.c
index 9732c9b..0f6a55f 100644
--- a/networking/ntpd.c
+++ b/networking/ntpd.c
@@ -1985,6 +1985,13 @@ recv_and_process_client_pkt(void /*int fd*/)
 		goto bail;
 	}
 
+	/* Respond only to client and symmetric active packets */
+	if ((msg.m_status & MODE_MASK) != MODE_CLIENT
+	 && (msg.m_status & MODE_MASK) != MODE_SYM_ACT
+	) {
+		goto bail;
+	}
+
 	query_status = msg.m_status;
 	query_xmttime = msg.m_xmttime;