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authorPatrick McHardy <kaber@trash.net>2006-06-30 05:33:12 +0200
committerGreg Kroah-Hartman <gregkh@suse.de>2006-06-30 14:06:52 -0700
commit70a00d8615ea4c408978d6efc23c89d4e7c12518 (patch)
tree20f792d0ca0ca310ad64952d71b0c743b3a75824
parentea144a8cff7622fba2c1083e760bd18605ecd6b4 (diff)
[PATCH] NETFILTER: SCTP conntrack: fix crash triggered by packet without chunks [CVE-2006-2934]
When a packet without any chunks is received, the newconntrack variable in sctp_packet contains an out of bounds value that is used to look up an pointer from the array of timeouts, which is then dereferenced, resulting in a crash. Make sure at least a single chunk is present. Problem noticed by George A. Theall <theall@tenablesecurity.com> Signed-off-by: Patrick McHardy <kaber@trash.net> Signed-off-by: Chris Wright <chrisw@sous-sol.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
-rw-r--r--net/ipv4/netfilter/ip_conntrack_proto_sctp.c2
-rw-r--r--net/netfilter/nf_conntrack_proto_sctp.c2
2 files changed, 2 insertions, 2 deletions
diff --git a/net/ipv4/netfilter/ip_conntrack_proto_sctp.c b/net/ipv4/netfilter/ip_conntrack_proto_sctp.c
index df67679a063d..b82be9314f69 100644
--- a/net/ipv4/netfilter/ip_conntrack_proto_sctp.c
+++ b/net/ipv4/netfilter/ip_conntrack_proto_sctp.c
@@ -254,7 +254,7 @@ static int do_basic_checks(struct ip_conntrack *conntrack,
}
DEBUGP("Basic checks passed\n");
- return 0;
+ return count == 0;
}
static int new_state(enum ip_conntrack_dir dir,
diff --git a/net/netfilter/nf_conntrack_proto_sctp.c b/net/netfilter/nf_conntrack_proto_sctp.c
index cd2326dde02f..7fcd1dd6eb9d 100644
--- a/net/netfilter/nf_conntrack_proto_sctp.c
+++ b/net/netfilter/nf_conntrack_proto_sctp.c
@@ -259,7 +259,7 @@ static int do_basic_checks(struct nf_conn *conntrack,
}
DEBUGP("Basic checks passed\n");
- return 0;
+ return count == 0;
}
static int new_state(enum ip_conntrack_dir dir,