diff options
| author | Patrick McHardy <kaber@trash.net> | 2007-06-05 14:14:22 +0200 |
|---|---|---|
| committer | Chris Wright <chrisw@sous-sol.org> | 2007-06-07 14:23:05 -0700 |
| commit | 13ad357c616a85828fa224c0876a393d1dd6f59f (patch) | |
| tree | 2fb97a31bf502de57d3c69c35b97ba1e62328069 | |
| parent | 6a5357887e4ebfd9c0f472cffc58bcdf426f4cad (diff) | |
[PATCH] 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/ipv4/netfilter/ip_conntrack_proto_sctp.c | 3 | ||||
| -rw-r--r-- | net/netfilter/nf_conntrack_proto_sctp.c | 3 |
2 files changed, 4 insertions, 2 deletions
diff --git a/net/ipv4/netfilter/ip_conntrack_proto_sctp.c b/net/ipv4/netfilter/ip_conntrack_proto_sctp.c index 2443322e412..ff483785ad4 100644 --- a/net/ipv4/netfilter/ip_conntrack_proto_sctp.c +++ b/net/ipv4/netfilter/ip_conntrack_proto_sctp.c @@ -461,7 +461,8 @@ 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; } diff --git a/net/netfilter/nf_conntrack_proto_sctp.c b/net/netfilter/nf_conntrack_proto_sctp.c index 76e26366822..fcc9152742d 100644 --- a/net/netfilter/nf_conntrack_proto_sctp.c +++ b/net/netfilter/nf_conntrack_proto_sctp.c @@ -470,7 +470,8 @@ 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; } |