[NETFILTER]: Fix small information leak in SO_ORIGINAL_DST (CVE-2006-1343)

It appears that sockaddr_in.sin_zero is not zeroed during
getsockopt(...SO_ORIGINAL_DST...) operation. This can lead
to an information leak (CVE-2006-1343).

Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 2 insertions, 0 deletions

diff --git a/net/ipv4/netfilter/ip_conntrack_core.c b/net/ipv4/netfilter/ip_conntrack_core.c
index 979a2eac6f00..a297da7bbef5 100644
--- a/net/ipv4/netfilter/ip_conntrack_core.c
+++ b/net/ipv4/netfilter/ip_conntrack_core.c
@@ -1318,6 +1318,7 @@ getorigdst(struct sock *sk, int optval, void __user *user, int *len)
                         .tuple.dst.u.tcp.port;
                 sin.sin_addr.s_addr = ct->tuplehash[IP_CT_DIR_ORIGINAL]
                         .tuple.dst.ip;
+                memset(sin.sin_zero, 0, sizeof(sin.sin_zero));
 
                 DEBUGP("SO_ORIGINAL_DST: %u.%u.%u.%u %u\n",
                        NIPQUAD(sin.sin_addr.s_addr), ntohs(sin.sin_port));
diff --git a/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4.c b/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4.c
index 5bc9f64d7b5b..77d974443c7b 100644
--- a/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4.c
+++ b/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4.c
@@ -348,6 +348,7 @@ getorigdst(struct sock *sk, int optval, void __user *user, int *len)
                         .tuple.dst.u.tcp.port;
                 sin.sin_addr.s_addr = ct->tuplehash[IP_CT_DIR_ORIGINAL]
                         .tuple.dst.u3.ip;
+                memset(sin.sin_zero, 0, sizeof(sin.sin_zero));
 
                 DEBUGP("SO_ORIGINAL_DST: %u.%u.%u.%u %u\n",
                        NIPQUAD(sin.sin_addr.s_addr), ntohs(sin.sin_port));