| Dear all, Iâve been running tor non-exit relay freshhumbug at torrelay.nl for about 3 months now. Recently, I tried running it as an exit relay for a week, with following interesting results. Set up: - Ubuntu 14.04 running as VPS with transip.nl, latest release version of Tor - bandwidth rate set to between 1 MB/s and 2 MB/s - VERY reduced exit policy (listed below) Part 1: Abuse over HTTP. Within one week of being an exit, my provider forwarded the following abuse notification to me (XXXX is the abused Russian website, ZZZZ is me): ==== Greetings, XXXX abuse team like to inform you, that we have had mass bruteforce attempts to the Joomla / WordPress control panel on the our shared-hosting server XXXX from your network, from IP address ZZZZ During the last 30 minutes we recorded 333 attempts like this: XXXX - [14/Oct/2014:14:17:49 +0400] "POST /administrator/index.php HTTP/1.1" 200 11646 "-" "-" XXXX - [14/Oct/2014:14:17:49 +0400] "POST /administrator/index.php HTTP/1.1" 200 11646 "-" "-" XXXX - [14/Oct/2014:14:17:51 +0400] "POST /administrator/index.php HTTP/1.1" 200 11646 "-" "-" XXXX - [14/Oct/2014:14:17:51 +0400] "POST /administrator/index.php HTTP/1.1" 200 11646 "-" "-â XXXX - [14/Oct/2014:14:17:54 +0400] "POST /administrator/index.php HTTP/1.1" 499 0 "-" "-" ==== Lesson (for me at least): since HTTP was used, even a very reduced exit policy is does not make one immune to abuse problems. At this point I reverted back to being a non-exit relay, as I have no interest in having to deal with this. Part 2: Stealrat infection. As part of being an exit relay, I set reverse DNS to this-is-a-tor-exit.torrelay.nl, and I displayed the this-is-a-tor-exit-node.html web page on port 80, using the DirPortFrontPage option. A few days after having shut down my exit, I received notification from my provider that they have been told that my IP address was infected with Stealrat. It hosted a Stealrat PHP file, used to send spam. - http://blog.trendmicro.com/trendlabs-security-intelligence/compromised-sites-conceal-stealrat-botnet-operations/ - http://www.trendmicro.com/cloud-content/us/pdfs/security-intelligence/white-papers/wp-stealrat.pdf However, the only thing I do with my VPS is run tor. I donât run a web site, and donât have apache or whatever installed. I didnât investigate much further, but my hypothesis is that when publishing the tor-exit notice on port 80 either tor internally uses a web server or enables a web server thatâs present in the system. Either way, that webserver was hacked through a PHP hack. (Note that I received the Stealrat notification only after stopping my exit node. Iâm not sure if the Stealrat hack was still active or not. I couldnât find relevant PHP files on my system.) Since I didnât want to spend time or effort (figuring out how to) clean my system, I reinstalled ubuntu & tor (only ~40 min work anyway). Lesson (for me): using the DirPortFrontPage option opens up an unexpected web server vulnerability. Perhaps this information is useful for others. With best regards, Kees Relevant parts of the torrc: ORPort 9001 # port used for relaying traffic DirPort 80 # port used for mirroring directory information - not used, since have accountingmax SocksPort 0 # prevents tor from being used as a client RelayBandwidthRate 1000 KB # limit for the bandwidth we'll use to relay RelayBandwidthBurst 10 MB # maximum rate when relaying bursts of traffic BandwidthRate 1000 KB # same as RelayBandwidthRate BandwidthBurst 10 M # same as RelayBandwidthBurst DirPortFrontPage /home/administrator/.arm/this-is-a-tor-exit.html ExitPolicy accept *:20-23 # FTP, SSH, telnet ExitPolicy accept *:43 # WHOIS ExitPolicy accept *:53 # DNS ExitPolicy accept *:79-81 # finger, HTTP ExitPolicy accept *:88 # kerberos ExitPolicy accept *:220 # IMAP3 ExitPolicy accept *:389 # LDAP ExitPolicy accept *:443 # HTTPS ExitPolicy accept *:464 # kpasswd ExitPolicy accept *:531 # IRC/AIM ExitPolicy accept *:543-544 # Kerberos ExitPolicy accept *:554 # RTSP ExitPolicy accept *:563 # NNTP over SSL ExitPolicy accept *:636 # LDAP over SSL ExitPolicy accept *:749 # kerberos ExitPolicy accept *:981 # Remote HTTPS management for firewall ExitPolicy accept *:989-995 # FTP over SSL, Netnews Administration System, telnets, IMAP over SSL, ircs, POP3 over SSL ExitPolicy accept *:1194 # OpenVPN ExitPolicy accept *:1293 # PKT-KRB-IPSec ExitPolicy accept *:1723 # PPTP ExitPolicy accept *:1755 # RTSP ExitPolicy accept *:2086-2087 # GNUnet, ELI ExitPolicy accept *:3690 # SVN ExitPolicy accept *:4321 # RWHOIS ExitPolicy accept *:5222-5223 # XMPP, XMPP over SSL ExitPolicy accept *:5900 # VNC ExitPolicy accept *:6660-6669 # IRC ExitPolicy accept *:6679 # IRC SSL ExitPolicy accept *:6697 # IRC SSL ExitPolicy accept *:8008 # HTTP alternate ExitPolicy accept *:8080 # HTTP Proxies ExitPolicy accept *:8082 # HTTPS Electrum Bitcoin port ExitPolicy accept *:8332-8333 # Bitcoin ExitPolicy accept *:8443 # PCsync HTTPS ExitPolicy accept *:8888 # HTTP Proxies, NewsEDGE ExitPolicy accept *:9418 # git ExitPolicy accept *:11371 # OpenPGP hkp (http keyserver protocol) ExitPolicy accept *:50002 # Electrum Bitcoin SSL ExitPolicy reject *:* |
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