TWxSoftware/twx-linux
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

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

Browse Source 
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: Adrian Bunk <bunk@stusta.de>
This commit is contained in:
Patrick McHardy
2007-07-22 17:31:40 +02:00
committed by Adrian Bunk
parent 0343e39451
commit de3b9c4f8b
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
@@ -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;
}
net/netfilter/nf_conntrack_proto_sctp.c
+2 -1
View File
@@ -467,7 +467,8 @@ 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;
}