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authorPatrick McHardy <kaber@trash.net>2007-07-10 23:24:52 -0700
committerDavid S. Miller <davem@davemloft.net>2007-07-10 23:24:52 -0700
commit99d24edeb6abc6ca3a0d0fbdb83c664c04403c8c (patch)
tree1ddcd854dd106878c4e7fcc55147131a137d4aca /net
parent56b3d975bbce65f655c5612b4822da671f9fd9b2 (diff)
[NETFILTER]: {ip, nf}_conntrack_sctp: fix remotely triggerable NULL ptr dereference (CVE-2007-2876)
When creating a new connection by sending an unknown chunk type, we don't transition to a valid state, causing a NULL pointer dereference in sctp_packet when accessing sctp_timeouts[SCTP_CONNTRACK_NONE]. Fix by don't creating new conntrack entry if initial state is invalid. Noticed by Vilmos Nebehaj <vilmos.nebehaj@ramsys.hu> Signed-off-by: Patrick McHardy <kaber@trash.net> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de> Signed-off-by: Chris Wright <chrisw@sous-sol.org> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
-rw-r--r--net/netfilter/nf_conntrack_proto_sctp.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/net/netfilter/nf_conntrack_proto_sctp.c b/net/netfilter/nf_conntrack_proto_sctp.c
index 265769e5002..debfe61378a 100644
--- a/net/netfilter/nf_conntrack_proto_sctp.c
+++ b/net/netfilter/nf_conntrack_proto_sctp.c
@@ -431,7 +431,8 @@ static int sctp_new(struct nf_conn *conntrack, const struct sk_buff *skb,
SCTP_CONNTRACK_NONE, sch->type);
/* Invalid: delete conntrack */
- if (newconntrack == SCTP_CONNTRACK_MAX) {
+ if (newconntrack == SCTP_CONNTRACK_NONE ||
+ newconntrack == SCTP_CONNTRACK_MAX) {
pr_debug("nf_conntrack_sctp: invalid new deleting.\n");
return 0;
}