Tor ControlPort security bypass
| tor-controlport-security-bypass (35784) |  Medium Risk |
Description:
Tor could allow a remote attacker to bypass security restrictions, caused by a vulnerability in ControlPort when handling multiple connections. If the ControlPort is enabled, a remote attacker could exploit this vulnerability to bypass authentication and rewrite the "torrc" configuration file of another user, which could reveal the user's anonymity.
Platforms Affected:
- Tor, Tor prior to 0.1.2.16
Remedy:
Upgrade to the latest version of Tor (0.1.2.16 or later), available from the Tor Web site. See References.
Consequences:
Bypass Security
References:
- Tor Mailing list, Thu, 2 Aug 2007 18:19:18 -0400, Tor 0.1.2.16 is released (critical security fix) at http://archives.seul.org/or/announce/Aug-2007/msg00000.html.
- Tor Web site, Tor: anonymity online at http://tor.eff.org/index.html.en.
- BID-25188: Tor ControlPort Missing Authentication Unauthorized Access Vulnerability
- CVE-2007-4174: 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.
- FrSIRT/ADV-2007-2768: Tor ControlPort Missing Authentication Configuration File Rewrite Vulnerability
- SA26301: Tor ControlPort "torrc" Rewrite Vulnerability
- SECTRACK ID: 1018510: Tor ControlPort Authentication Bug Lets Remote Users Modify the `torrc` Configuration File
Reported:
Aug 02, 2007
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