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[PATCH] NETFILTER: {ip, nf}_conntrack_sctp: fix remotely triggerable NULL ptr dereference (CVE-2007-2876)

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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>

CC: Kiran Kumar Immidi <immidi_kiran@yahoo.com>
Cc: David Miller <davem@davemloft.net>
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>
This commit is contained in:
Patrick McHardy
2007-06-05 14:14:22 +02:00
committed by Chris Wright
parent c23e7e4c94
commit 8c640bd0c6
2 changed files with 4 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files
net/ipv4/netfilter/ip_conntrack_proto_sctp.c
+2 -1
View File
@@ -460,7 +460,8 @@ static int sctp_new(struct ip_conntrack *conntrack,
SCTP_CONNTRACK_NONE, sch->type);
/* Invalid: delete conntrack */
if (newconntrack == SCTP_CONNTRACK_MAX) {
if (newconntrack == SCTP_CONNTRACK_NONE ||
newconntrack == SCTP_CONNTRACK_MAX) {
DEBUGP("ip_conntrack_sctp: invalid new deleting.\n");
return 0;
}
net/netfilter/nf_conntrack_proto_sctp.c
+2 -1
View File
@@ -469,7 +469,8 @@ 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) {
DEBUGP("nf_conntrack_sctp: invalid new deleting.\n");
return 0;
}