Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 64831fb6 authored by Wander Lairson Costa's avatar Wander Lairson Costa Committed by Greg Kroah-Hartman
Browse files

netfilter: xt_sctp: validate the flag_info count 



commit e99476497687ef9e850748fe6d232264f30bc8f9 upstream.

sctp_mt_check doesn't validate the flag_count field. An attacker can
take advantage of that to trigger a OOB read and leak memory
information.

Add the field validation in the checkentry function.

Fixes: 2e4e6a17 ("[NETFILTER] x_tables: Abstraction layer for {ip,ip6,arp}_tables")
Cc: stable@vger.kernel.org
Reported-by: default avatarLucas Leong <wmliang@infosec.exchange>
Signed-off-by: default avatarWander Lairson Costa <wander@redhat.com>
Signed-off-by: default avatarPablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 28ce8495

net/netfilter/xt_sctp.c

+2 −0
Original line number Diff line number Diff line
@@ -150,6 +150,8 @@ static int sctp_mt_check(const struct xt_mtchk_param *par) 
{

	const struct xt_sctp_info *info = par->matchinfo;



	if (info->flag_count > ARRAY_SIZE(info->flag_info))

		return -EINVAL;

	if (info->flags & ~XT_SCTP_VALID_FLAGS)

		return -EINVAL;

	if (info->invflags & ~XT_SCTP_VALID_FLAGS)