diff options
| author | Patrick McHardy <kaber@trash.net> | 2007-06-05 14:14:22 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2007-07-10 11:08:22 -0700 |
| commit | 8b1d585987bbac55cde85650b47b8eaebce54e13 (patch) | |
| tree | 83460691442029e951fef7553293a8775541ce1c | |
| parent | 7dcca30a32aadb0520417521b0c44f42d09fe05c (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>
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>
| -rw-r--r-- | net/netfilter/nf_conntrack_proto_sctp.c | 3 |
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 0d3254b974c..6e41ba5b034 100644 --- a/net/netfilter/nf_conntrack_proto_sctp.c +++ b/net/netfilter/nf_conntrack_proto_sctp.c @@ -460,7 +460,8 @@ 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; } |