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authorPatrick McHardy <kaber@trash.net>2007-06-05 14:14:22 +0200
committerChris Wright <chrisw@sous-sol.org>2007-06-07 14:23:05 -0700
commit13ad357c616a85828fa224c0876a393d1dd6f59f (patch)
tree2fb97a31bf502de57d3c69c35b97ba1e62328069
parent6a5357887e4ebfd9c0f472cffc58bcdf426f4cad (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.c3
-rw-r--r--net/netfilter/nf_conntrack_proto_sctp.c3
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 2443322e4128..ff483785ad4e 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 76e263668222..fcc9152742da 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;
}