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.
*CVSS:
| Base Score: | 7 |
| Access Vector: | Remote |
| Access Complexity: | Low |
| Authentication: | Not Required |
| Confidentiality Impact: | Partial |
| Integrity Impact: | Partial |
| Availability Impact: | Partial |
| Temporal Score: | 5.5 |
| Exploitability: | Proof-Of-Concept |
| Remediation Level: | Official-Fix |
| Report Confidence: | Confirmed |
Consequences:
Bypass Security
Remedy:
Upgrade to the latest version of Tor (0.1.2.16 or later), available from the Tor Web site. See References.
References:
- Tor Mailing list, Thu, 2 Aug 2007 18:19:18 -0400: Tor 0.1.2.16 is released (critical security fix).
- Tor Web site: Tor: anonymity online.
- 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.
- SA26301: Tor ControlPort "torrc" Rewrite Vulnerability
- SECTRACK ID: 1018510: Tor ControlPort Authentication Bug Lets Remote Users Modify the `torrc` Configuration File
- VUPEN/ADV-2007-2768: Tor ControlPort Missing Authentication Configuration File Rewrite Vulnerability
Platforms Affected:
- Tor Tor prior to 0.1.2.16
Reported:
Aug 02, 2007
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For corrections or additions please email xforce@iss.net
* According to the Forum of Incident Response and Security Teams (FIRST), the Common Vulnerability Scoring System (CVSS) is an "industry open standard designed to convey vulnerability severity and help to determine urgency and priority of response." IBM PROVIDES THE CVSS SCORES "AS IS" WITHOUT WARRANTY OF ANY KIND, INCLUDING THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. CUSTOMERS ARE RESPONSIBLE FOR ASSESSING THE IMPACT OF ANY ACTUAL OR POTENTIAL SECURITY VULNERABILITY.
The information within this database may change without notice. Use of this information constitutes acceptance for use in an AS IS condition. There are NO warranties, implied or otherwise, with regard to this information or its use. Any use of this information is at the user's risk. In no event shall IBM be held liable for any damages whatsoever arising out of or in connection with the use or spread of this information.