From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.linuxfoundation.org ([140.211.169.12]:42190 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751599AbeA2NCO (ORCPT ); Mon, 29 Jan 2018 08:02:14 -0500 From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Ulrich Weber , Marco Angaroni , Pablo Neira Ayuso , Michal Kubecek Subject: [PATCH 4.4 36/74] netfilter: nf_conntrack_sip: extend request line validation Date: Mon, 29 Jan 2018 13:56:41 +0100 Message-Id: <20180129123849.229429127@linuxfoundation.org> In-Reply-To: <20180129123847.507563674@linuxfoundation.org> References: <20180129123847.507563674@linuxfoundation.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Sender: stable-owner@vger.kernel.org List-ID: 4.4-stable review patch. If anyone has any objections, please let me know. ------------------ From: Ulrich Weber commit 444f901742d054a4cd5ff045871eac5131646cfb upstream. on SIP requests, so a fragmented TCP SIP packet from an allow header starting with INVITE,NOTIFY,OPTIONS,REFER,REGISTER,UPDATE,SUBSCRIBE Content-Length: 0 will not bet interpreted as an INVITE request. Also Request-URI must start with an alphabetic character. Confirm with RFC 3261 Request-Line = Method SP Request-URI SP SIP-Version CRLF Fixes: 30f33e6dee80 ("[NETFILTER]: nf_conntrack_sip: support method specific request/response handling") Signed-off-by: Ulrich Weber Acked-by: Marco Angaroni Signed-off-by: Pablo Neira Ayuso Acked-by: Michal Kubecek Signed-off-by: Greg Kroah-Hartman --- net/netfilter/nf_conntrack_sip.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) --- a/net/netfilter/nf_conntrack_sip.c +++ b/net/netfilter/nf_conntrack_sip.c @@ -1434,9 +1434,12 @@ static int process_sip_request(struct sk handler = &sip_handlers[i]; if (handler->request == NULL) continue; - if (*datalen < handler->len || + if (*datalen < handler->len + 2 || strncasecmp(*dptr, handler->method, handler->len)) continue; + if ((*dptr)[handler->len] != ' ' || + !isalpha((*dptr)[handler->len+1])) + continue; if (ct_sip_get_header(ct, *dptr, 0, *datalen, SIP_HDR_CSEQ, &matchoff, &matchlen) <= 0) {