Tor up to 0.3.0.8 Guard Relay De-anonymization information disclosure

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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5.5$0-$5k0.00

A vulnerability was found in Tor up to 0.3.0.8 (Network Encryption Software). It has been rated as problematic. Affected by this issue is some unknown functionality of the component Guard Relay. The manipulation with an unknown input leads to a information disclosure vulnerability (De-anonymization). Using CWE to declare the problem leads to CWE-200. The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. Impacted is confidentiality. CVE summarizes:

Tor 0.3.x before 0.3.0.9 has a guard-selection algorithm that only considers the exit relay (not the exit relay's family), which might allow remote attackers to defeat intended anonymity properties by leveraging the existence of large families.

The bug was discovered 06/29/2017. The weakness was released 07/02/2017 (Website). The advisory is available at blog.torproject.org. This vulnerability is handled as CVE-2017-0377 since 11/29/2016. The attack may be launched remotely. No form of authentication is required for exploitation. The technical details are unknown and an exploit is not available. This vulnerability is assigned to T1592 by the MITRE ATT&CK project.

The vulnerability was handled as a non-public zero-day exploit for at least 1 days. During that time the estimated underground price was around $5k-$25k. The vulnerability scanner Nessus provides a plugin with the ID 101186 (FreeBSD : tor -- security regression (0b9f4b5e-5d82-11e7-85df-14dae9d5a9d2)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family FreeBSD Local Security Checks and running in the context l.

Upgrading to version 0.3.0.9 eliminates this vulnerability. A possible mitigation has been published even before and not after the disclosure of the vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (101186). Entries connected to this vulnerability are available at VDB-149616, VDB-152020, VDB-152021 and VDB-177725.

Productinfo

Type

Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB CVSS-B Score: 🔍
VulDB CVSS-BT Score: 🔍
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.6
VulDB Meta Temp Score: 5.5

VulDB Base Score: 3.7
VulDB Temp Score: 3.6
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.5
NVD Vector: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Name: De-anonymization
Class: Information disclosure / De-anonymization
CWE: CWE-200 / CWE-284 / CWE-266
CAPEC: 🔍
ATT&CK: 🔍

Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 101186
Nessus Name: FreeBSD : tor -- security regression (0b9f4b5e-5d82-11e7-85df-14dae9d5a9d2)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: Tor 0.3.0.9
Patch: github.com

Timelineinfo

11/29/2016 🔍
06/29/2017 +212 days 🔍
06/30/2017 +1 days 🔍
07/02/2017 +2 days 🔍
07/02/2017 +0 days 🔍
07/02/2017 +0 days 🔍
07/03/2017 +1 days 🔍
12/09/2022 +1985 days 🔍

Sourcesinfo

Advisory: 665baf5ed5c6186d973c46cdea165c0548027350
Status: Not defined
Confirmation: 🔍

CVE: CVE-2017-0377 (🔍)
See also: 🔍

Entryinfo

Created: 07/02/2017 20:45
Updated: 12/09/2022 15:13
Changes: 07/02/2017 20:45 (68), 10/21/2019 17:50 (3), 12/09/2022 15:13 (5)
Complete: 🔍
Cache ID: 3:F92:103

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