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[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>
This commit is contained in:
Patrick McHardy 2007-07-10 23:24:52 -07:00 committed by David S. Miller
parent 56b3d975bb
commit 99d24edeb6
1 changed files with 2 additions and 1 deletions
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3
net/netfilter/nf_conntrack_proto_sctp.c
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@ -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;
}