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Description: CVE-2015-6496 fix
This upstream patch fixes CVE-2015-6496.
Author: Pablo Neira Ayuso <pablo@netfilter.org>
Origin: upstream, http://git.netfilter.org/conntrack-tools/commit/?id=c392c159605956c7bd4a264ab4490e2b2704c0cd
Bug: http://bugzilla.netfilter.org/show_bug.cgi?id=910
Bug-Debian: https://bugs.debian.org/796103
Last-Update: 2015-08-19
--- conntrack-1.4.2.orig/src/build.c
+++ conntrack-1.4.2/src/build.c
@@ -105,14 +105,14 @@ static enum nf_conntrack_attr nat_type[]
ATTR_ORIG_NAT_SEQ_OFFSET_AFTER, ATTR_REPL_NAT_SEQ_CORRECTION_POS,
ATTR_REPL_NAT_SEQ_OFFSET_BEFORE, ATTR_REPL_NAT_SEQ_OFFSET_AFTER };
+/* ICMP, UDP and TCP are always loaded with nf_conntrack_ipv4 */
static void build_l4proto_tcp(const struct nf_conntrack *ct, struct nethdr *n)
{
- ct_build_group(ct, ATTR_GRP_ORIG_PORT, n, NTA_PORT,
- sizeof(struct nfct_attr_grp_port));
-
if (!nfct_attr_is_set(ct, ATTR_TCP_STATE))
return;
+ ct_build_group(ct, ATTR_GRP_ORIG_PORT, n, NTA_PORT,
+ sizeof(struct nfct_attr_grp_port));
ct_build_u8(ct, ATTR_TCP_STATE, n, NTA_TCP_STATE);
if (CONFIG(sync).tcp_window_tracking) {
ct_build_u8(ct, ATTR_TCP_WSCALE_ORIG, n, NTA_TCP_WSCALE_ORIG);
@@ -122,12 +122,12 @@ static void build_l4proto_tcp(const stru
static void build_l4proto_sctp(const struct nf_conntrack *ct, struct nethdr *n)
{
- ct_build_group(ct, ATTR_GRP_ORIG_PORT, n, NTA_PORT,
- sizeof(struct nfct_attr_grp_port));
-
+ /* SCTP is optional, make sure nf_conntrack_sctp is loaded */
if (!nfct_attr_is_set(ct, ATTR_SCTP_STATE))
return;
+ ct_build_group(ct, ATTR_GRP_ORIG_PORT, n, NTA_PORT,
+ sizeof(struct nfct_attr_grp_port));
ct_build_u8(ct, ATTR_SCTP_STATE, n, NTA_SCTP_STATE);
ct_build_u32(ct, ATTR_SCTP_VTAG_ORIG, n, NTA_SCTP_VTAG_ORIG);
ct_build_u32(ct, ATTR_SCTP_VTAG_REPL, n, NTA_SCTP_VTAG_REPL);
@@ -135,18 +135,22 @@ static void build_l4proto_sctp(const str
static void build_l4proto_dccp(const struct nf_conntrack *ct, struct nethdr *n)
{
- ct_build_group(ct, ATTR_GRP_ORIG_PORT, n, NTA_PORT,
- sizeof(struct nfct_attr_grp_port));
-
+ /* DCCP is optional, make sure nf_conntrack_dccp is loaded */
if (!nfct_attr_is_set(ct, ATTR_DCCP_STATE))
return;
+ ct_build_group(ct, ATTR_GRP_ORIG_PORT, n, NTA_PORT,
+ sizeof(struct nfct_attr_grp_port));
ct_build_u8(ct, ATTR_DCCP_STATE, n, NTA_DCCP_STATE);
ct_build_u8(ct, ATTR_DCCP_ROLE, n, NTA_DCCP_ROLE);
}
static void build_l4proto_icmp(const struct nf_conntrack *ct, struct nethdr *n)
{
+ /* This is also used by ICMPv6 and nf_conntrack_ipv6 is optional */
+ if (!nfct_attr_is_set(ct, ATTR_ICMP_TYPE))
+ return;
+
ct_build_u8(ct, ATTR_ICMP_TYPE, n, NTA_ICMP_TYPE);
ct_build_u8(ct, ATTR_ICMP_CODE, n, NTA_ICMP_CODE);
ct_build_u16(ct, ATTR_ICMP_ID, n, NTA_ICMP_ID);
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