From 9c48e1ea8cf8800cc5e2d39ccbb8b5ff9704f8e9 Mon Sep 17 00:00:00 2001 From: Patrick McHardy Date: Fri, 30 Jun 2006 05:33:12 +0200 Subject: [PATCH] [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 Signed-off-by: Patrick McHardy Signed-off-by: Chris Wright --- net/ipv4/netfilter/ip_conntrack_proto_sctp.c | 2 +- net/netfilter/nf_conntrack_proto_sctp.c | 2 +- 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 0416073c5600..2d3612cd5f18 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 0c6da496cfa9..9dab81d31821 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, -- 2.39.5