From a81954faaf6fdbf1fd8a1ef03f2d75e01f56a974 Mon Sep 17 00:00:00 2001 From: Patrick McHardy Date: Tue, 10 Jan 2006 02:00:07 +0100 Subject: [PATCH] [PATCH] Fix crash in ip_nat_pptp (CVE-2006-0036) When an inbound PPTP_IN_CALL_REQUEST packet is received the PPTP NAT helper uses a NULL pointer in pointer arithmentic to calculate the offset in the packet which needs to be mangled and corrupts random memory or crashes. Signed-off-by: Patrick McHardy Signed-off-by: Chris Wright --- net/ipv4/netfilter/ip_nat_helper_pptp.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/net/ipv4/netfilter/ip_nat_helper_pptp.c b/net/ipv4/netfilter/ip_nat_helper_pptp.c index e546203f5662..8ad7b36e242d 100644 --- a/net/ipv4/netfilter/ip_nat_helper_pptp.c +++ b/net/ipv4/netfilter/ip_nat_helper_pptp.c @@ -315,7 +315,7 @@ pptp_inbound_pkt(struct sk_buff **pskb, break; case PPTP_IN_CALL_REQUEST: /* only need to nat in case PAC is behind NAT box */ - break; + return NF_ACCEPT; case PPTP_WAN_ERROR_NOTIFY: pcid = &pptpReq->wanerr.peersCallID; break; -- 2.39.5