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authorPatrick McHardy <kaber@trash.net>2006-05-02 23:23:07 +0200
committerGreg Kroah-Hartman <gregkh@suse.de>2006-05-02 14:38:21 -0700
commit25b6badde42165b717e3c232e4992b3f6761920a (patch)
tree9ab2cf5e5f54d27a1f0cedac4e992ad609dce525
parent42a46c74c4520174b82a60ac44c15b5525cdf238 (diff)
[PATCH] NETFILTER: SCTP conntrack: fix infinite loop (CVE-2006-1527)
[NETFILTER]: SCTP conntrack: fix infinite loop fix infinite loop in the SCTP-netfilter code: check SCTP chunk size to guarantee progress of for_each_sctp_chunk(). (all other uses of for_each_sctp_chunk() are preceded by do_basic_checks(), so this fix should be complete.) Based on patch from Ingo Molnar <mingo@elte.hu> Signed-off-by: Patrick McHardy <kaber@trash.net> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
-rw-r--r--net/ipv4/netfilter/ip_conntrack_proto_sctp.c11
-rw-r--r--net/netfilter/nf_conntrack_proto_sctp.c11
2 files changed, 14 insertions, 8 deletions
diff --git a/net/ipv4/netfilter/ip_conntrack_proto_sctp.c b/net/ipv4/netfilter/ip_conntrack_proto_sctp.c
index be602e8aeab0..df67679a063d 100644
--- a/net/ipv4/netfilter/ip_conntrack_proto_sctp.c
+++ b/net/ipv4/netfilter/ip_conntrack_proto_sctp.c
@@ -235,12 +235,15 @@ static int do_basic_checks(struct ip_conntrack *conntrack,
flag = 1;
}
- /* Cookie Ack/Echo chunks not the first OR
- Init / Init Ack / Shutdown compl chunks not the only chunks */
- if ((sch->type == SCTP_CID_COOKIE_ACK
+ /*
+ * Cookie Ack/Echo chunks not the first OR
+ * Init / Init Ack / Shutdown compl chunks not the only chunks
+ * OR zero-length.
+ */
+ if (((sch->type == SCTP_CID_COOKIE_ACK
|| sch->type == SCTP_CID_COOKIE_ECHO
|| flag)
- && count !=0 ) {
+ && count !=0) || !sch->length) {
DEBUGP("Basic checks failed\n");
return 1;
}
diff --git a/net/netfilter/nf_conntrack_proto_sctp.c b/net/netfilter/nf_conntrack_proto_sctp.c
index cf798e61e379..cd2326dde02f 100644
--- a/net/netfilter/nf_conntrack_proto_sctp.c
+++ b/net/netfilter/nf_conntrack_proto_sctp.c
@@ -240,12 +240,15 @@ static int do_basic_checks(struct nf_conn *conntrack,
flag = 1;
}
- /* Cookie Ack/Echo chunks not the first OR
- Init / Init Ack / Shutdown compl chunks not the only chunks */
- if ((sch->type == SCTP_CID_COOKIE_ACK
+ /*
+ * Cookie Ack/Echo chunks not the first OR
+ * Init / Init Ack / Shutdown compl chunks not the only chunks
+ * OR zero-length.
+ */
+ if (((sch->type == SCTP_CID_COOKIE_ACK
|| sch->type == SCTP_CID_COOKIE_ECHO
|| flag)
- && count !=0 ) {
+ && count !=0) || !sch->length) {
DEBUGP("Basic checks failed\n");
return 1;
}