Tor up to 0.3.1.8 Downloaded Descriptor Anonymity path error

CVSS Meta Temp Score
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CTI Interest Score
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3.6$0-$5k0.00

Summaryinfo

A vulnerability classified as critical has been found in Tor up to 0.2.5.15/0.2.8.16/0.2.9.13/0.3.0.12/0.3.1.8. Affected by this vulnerability is an unknown functionality of the component Downloaded Descriptor Handler. The manipulation leads to path error (Anonymity). This vulnerability is referenced as CVE-2017-8822. Remote exploitation of the attack is possible. No exploit is available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability was found in Tor up to 0.2.5.15/0.2.8.16/0.2.9.13/0.3.0.12/0.3.1.8 (Network Encryption Software) and classified as problematic. This issue affects some unknown processing of the component Downloaded Descriptor Handler. The manipulation with an unknown input leads to a path error vulnerability (Anonymity). Using CWE to declare the problem leads to CWE-417. Impacted is confidentiality. The summary by CVE is:

In Tor before 0.2.5.16, 0.2.6 through 0.2.8 before 0.2.8.17, 0.2.9 before 0.2.9.14, 0.3.0 before 0.3.0.13, and 0.3.1 before 0.3.1.9, relays (that have incompletely downloaded descriptors) can pick themselves in a circuit path, leading to a degradation of anonymity, aka TROVE-2017-012.

The bug was discovered 12/01/2017. The weakness was published 12/01/2017 as TROVE-2017-012 as confirmed blog post (Website). The advisory is shared at blog.torproject.org. The blog post contains:

There are new stable releases today, fixing the following security issues.
The identification of this vulnerability is CVE-2017-8822 since 05/07/2017. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Neither technical details nor an exploit are publicly available.

The vulnerability scanner Nessus provides a plugin with the ID 104975 (Debian DSA-4054-1 : tor - security update), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Debian Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 176234 (Debian Security Update for tor (DSA 4054-1)).

Upgrading to version 0.2.5.16, 0.2.8.17, 0.2.8.14, 0.3.0.13 or 0.3.1.9 eliminates this vulnerability. A possible mitigation has been published immediately after the disclosure of the vulnerability. The blog post contains the following remark:

Tor 0.3.1.9 backports important security and stability fixes from the 0.3.2 development series. All Tor users should upgrade to this release, or to another of the releases coming out today.

The vulnerability is also documented in the vulnerability database at Tenable (104975). Similar entries are available at VDB-110162, VDB-110163, VDB-110164 and VDB-110166. If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Type

Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 3.7
VulDB Meta Temp Score: 3.7

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

NVD Base Score: 3.7
NVD Vector: 🔍

CVSSv2info

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

NVD Base Score: 🔍

Exploitinginfo

Name: Anonymity
Class: Path error / Anonymity
CWE: CWE-417
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 104975
Nessus Name: Debian DSA-4054-1 : tor - security update
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 703791
OpenVAS Name: Debian Security Advisory DSA 4054-1 (tor - security update)
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

Reaction Time: 🔍
0-Day Time: 🔍
Exposure Time: 🔍

Upgrade: Tor 0.2.5.16/0.2.8.17/0.2.8.14/0.3.0.13/0.3.1.9

Timelineinfo

05/07/2017 🔍
12/01/2017 +208 days 🔍
12/01/2017 +0 days 🔍
12/01/2017 +0 days 🔍
12/03/2017 +2 days 🔍
12/03/2017 +0 days 🔍
12/04/2017 +1 days 🔍
12/11/2019 +737 days 🔍

Sourcesinfo

Advisory: TROVE-2017-012
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2017-8822 (🔍)
GCVE (CVE): GCVE-0-2017-8822
GCVE (VulDB): GCVE-100-110165

OVAL: 🔍
See also: 🔍

Entryinfo

Created: 12/03/2017 15:04
Updated: 12/11/2019 21:29
Changes: 12/03/2017 15:04 (79), 12/11/2019 21:29 (2)
Complete: 🔍
Cache ID: 216::103

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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