nanog mailing list archives
Re: New Active Exploit: memcached on port 11211 UDP & TCP being exploited for reflection attacks
From: Bjørn Mork <bjorn () mork no>
Date: Fri, 02 Mar 2018 12:49:13 +0100
Owen DeLong <owen () delong com> writes:
I don’t agree that making RFC-1918 limitations a default in any daemon makes any sense whatsoever.
+1 One of the more annoying anti-features I know of in this regard is the dnsmasq rebind "protection". It claims to protect web browsers on the LAN against DNS rebind attacks. But the implementation does not consider which adresses are used on the LAN at all. It simply blocks any A record pointing to an RFC1918 address, making a few bogus assumptions: - IPv4 LAN addresses are selected from RFC1918 - RFC1918 addresses are never used on the WAN side of a CPE - Noone use IPv6 on their LAN It's hard to know how many users have been bitten by the first one. You'd have to depend on this rebind "protection" in the first place, and that would be.... stupid. But the second assumption regularily bites end users when their ISP provides some ISP internal service using RFC1918 addresses. Which of course is fine. The anti-feature has been enabled by default in OpenWrt for a long time, ref https://wiki.openwrt.org/doc/uci/dhcp#all_options , which means that there is a large user base having this enabled without knowing.
First, there are plenty of LANs out there that don’t use RFC-1918. Second, RFC-1918 doesn’t apply to IPv6 at all,
Could you try to explain that to the OpenWrt guys? Thanks Bjørn
Current thread:
- Re: New Active Exploit: memcached on port 11211 UDP & TCP being exploited for reflection attacks, (continued)
- Re: New Active Exploit: memcached on port 11211 UDP & TCP being exploited for reflection attacks Christopher Morrow (Mar 01)
- Re: New Active Exploit: memcached on port 11211 UDP & TCP being exploited for reflection attacks Randy Bush (Mar 01)
- Re: New Active Exploit: memcached on port 11211 UDP & TCP being exploited for reflection attacks Christopher Morrow (Mar 01)
- Re: New Active Exploit: memcached on port 11211 UDP & TCP being exploited for reflection attacks Christopher Morrow (Mar 01)
- Re: New Active Exploit: memcached on port 11211 UDP & TCP being exploited for reflection attacks Mike Hammett (Mar 01)
- Re: New Active Exploit: memcached on port 11211 UDP & TCP being exploited for reflection attacks Randy Bush (Mar 01)
- Re: New Active Exploit: memcached on port 11211 UDP & TCP being exploited for reflection attacks Jippen (Mar 01)
- Re: New Active Exploit: memcached on port 11211 UDP & TCP being exploited for reflection attacks Randy Bush (Mar 01)
- Re: New Active Exploit: memcached on port 11211 UDP & TCP being exploited for reflection attacks Christopher Morrow (Mar 01)
- Re: New Active Exploit: memcached on port 11211 UDP & TCP being exploited for reflection attacks Royce Williams (Mar 01)
- Re: New Active Exploit: memcached on port 11211 UDP & TCP being exploited for reflection attacks Stephen Satchell (Mar 02)
- Re: New Active Exploit: memcached on port 11211 UDP & TCP being exploited for reflection attacks Mark Andrews (Mar 02)
- Re: New Active Exploit: memcached on port 11211 UDP & TCP being exploited for reflection attacks K. Scott Helms (Mar 02)
- Message not available
- Re: New Active Exploit: memcached on port 11211 UDP & TCP being exploited for reflection attacks K. Scott Helms (Mar 02)