Date: Wed, 17 May 2017 09:56:27 -0400 From: Daniel Kahn Gillmor <dkg@...thhorseman.net> To: Robert Święcki <robert@...ecki.net>, oss-security@...ts.openwall.com Cc: "Jason A. Donenfeld" <Jason@...c4.com>, rxvt-unicode@...ts.schmorp.de, rxvt@...morp.de Subject: Re: terminal emulators' processing of escape sequences On Wed 2017-05-17 12:51:57 +0200, Robert Święcki wrote: > Please consider the following example: > > $ tail -n1 /etc/hosts | xxd > 00000000: 3132 372e 302e 302e 3309 1b47 513b 205a 127.0.0.3..GQ; Z > 00000010: 5a5a 0a ZZ. > $ ping ZZZ > PING ; (127.0.0.3) 56(84) bytes of data. > ^[G0 > 64 bytes from ; (127.0.0.3): icmp_seq=1 ttl=64 time=0.039 ms > ^[G0 > 64 bytes from ; (127.0.0.3): icmp_seq=2 ttl=64 time=0.032 ms > ^[G0 > ^C > --- ; ping statistics --- > 2 packets transmitted, 2 received, 0% packet loss, time 1014ms > rtt min/avg/max/mdev = 0.032/0.035/0.039/0.006 ms > ^[G0 > $ 0 > bash: 0: command not found what version of ping are you using? I was unable to replicate this with either the debian iputils-ping package version 3:20161105-1, or with debian inetutils-ping package version 2:1.9.4-2+b1. neither of them seem to do a getnameinfo() at all if it is initially supplied with an IP address. That said, with the same last line of /etc/hosts, getent is willing to pass along the garbage chars: 0 test@...t:~$ getent hosts 127.0.0.3 127.0.0.3 ; ZZZ ^[G0 0 test@...t:~$ 0 bash: 0: command not found 127 test@...t:~$ --dkg Download attachment "signature.asc" of type "application/pgp-signature" (833 bytes)
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