CVE-2014-8160: Improper Input Validation (CWE-20)
value: net/netfilter/nf_conntrack_proto_generic.c in the Linux kernel before 3.18 generates incorrect conntrack entries during handling of certain iptables rule sets for the SCTP, DCCP, GRE, and UDP-Lite protocols, which allows remote attackers to bypass intended access restrictions via packets with disallowed port numbers.
CWE description: The product receives input or data, but it does
        not validate or incorrectly validates that the input has the
        properties that are required to process the data safely and
        correctly.
Published: 2015-03-02T11:59Z
Repository: https://github.com/torvalds/linux
Language: C
Files changed: net/netfilter/nf_conntrack_proto_generic.c
Commit date: 2014-09-29 12:17:49 +0200
Commit message: netfilter: conntrack: disable generic tracking for known protocols

Given following iptables ruleset:

-P FORWARD DROP
-A FORWARD -m sctp --dport 9 -j ACCEPT
-A FORWARD -p tcp --dport 80 -j ACCEPT
-A FORWARD -p tcp -m conntrack -m state ESTABLISHED,RELATED -j ACCEPT

One would assume that this allows SCTP on port 9 and TCP on port 80.
Unfortunately, if the SCTP conntrack module is not loaded, this allows
*all* SCTP communication, to pass though, i.e. -p sctp -j ACCEPT,
which we think is a security issue.

This is because on the first SCTP packet on port 9, we create a dummy
"generic l4" conntrack entry without any port information (since
conntrack doesn't know how to extract this information).

All subsequent packets that are unknown will then be in established
state since they will fallback to proto_generic and will match the
'generic' entry.

Our originally proposed version [1] completely disabled generic protocol
tracking, but Jozsef suggests to not track protocols for which a more
suitable helper is available, hence we now mitigate the issue for in
tree known ct protocol helpers only, so that at least NAT and direction
information will still be preserved for others.

 [1] http://www.spinics.net/lists/netfilter-devel/msg33430.html

Joint work with Daniel Borkmann.

Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Daniel Borkmann <dborkman@redhat.com>
Acked-by: Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

Diff: diff --git a/net/netfilter/nf_conntrack_proto_generic.c b/net/netfilter/nf_conntrack_proto_generic.c
index d25f293776482f..957c1db6665254 100644
--- a/net/netfilter/nf_conntrack_proto_generic.c
+++ b/net/netfilter/nf_conntrack_proto_generic.c
@@ -12,10 +12,34 @@
 #include <linux/netfilter.h>
 #include <net/netfilter/nf_conntrack_l4proto.h>
 
 static unsigned int nf_ct_generic_timeout __read_mostly = 600*HZ;
 
+static bool nf_generic_should_process(u8 proto)
+{
+	switch (proto) {
+#ifdef CONFIG_NF_CT_PROTO_SCTP_MODULE
+	case IPPROTO_SCTP:
+		return false;
+#endif
+#ifdef CONFIG_NF_CT_PROTO_DCCP_MODULE
+	case IPPROTO_DCCP:
+		return false;
+#endif
+#ifdef CONFIG_NF_CT_PROTO_GRE_MODULE
+	case IPPROTO_GRE:
+		return false;
+#endif
+#ifdef CONFIG_NF_CT_PROTO_UDPLITE_MODULE
+	case IPPROTO_UDPLITE:
+		return false;
+#endif
+	default:
+		return true;
+	}
+}
+
 static inline struct nf_generic_net *generic_pernet(struct net *net)
 {
 	return &net->ct.nf_ct_proto.generic;
 }
 
@@ -65,11 +89,11 @@ static int generic_packet(struct nf_conn *ct,
 
 /* Called when a new connection for this protocol found. */
 static bool generic_new(struct nf_conn *ct, const struct sk_buff *skb,
 			unsigned int dataoff, unsigned int *timeouts)
 {
-	return true;
+	return nf_generic_should_process(nf_ct_protonum(ct));
 }
 
 #if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT)
 
 #include <linux/netfilter/nfnetlink.h>

Vulnerable code: 	return true;
Fixed code: static bool nf_generic_should_process(u8 proto)
{
	switch (proto) {
#ifdef CONFIG_NF_CT_PROTO_SCTP_MODULE
	case IPPROTO_SCTP:
		return false;
#endif
#ifdef CONFIG_NF_CT_PROTO_DCCP_MODULE
	case IPPROTO_DCCP:
		return false;
#endif
#ifdef CONFIG_NF_CT_PROTO_GRE_MODULE
	case IPPROTO_GRE:
		return false;
#endif
#ifdef CONFIG_NF_CT_PROTO_UDPLITE_MODULE
	case IPPROTO_UDPLITE:
		return false;
#endif
	default:
		return true;
	}
}

	return nf_generic_should_process(nf_ct_protonum(ct));