Tor up to 0.3.1.8 Replay-Cache Protection access control

CVSS Meta Temp Score
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CTI Interest Score
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7.1$0-$5k0.00

Summaryinfo

A vulnerability labeled 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. This affects an unknown function of the component Replay-Cache Protection. Such manipulation leads to access control. This vulnerability is uniquely identified as CVE-2017-8819. The attack can be launched remotely. No exploit exists. The affected component should be upgraded.

Detailsinfo

A vulnerability, which was 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 (Network Encryption Software). Affected by this issue is an unknown part of the component Replay-Cache Protection. The manipulation with an unknown input leads to a access control vulnerability. Using CWE to declare the problem leads to CWE-284. The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor. Impacted is confidentiality, integrity, and availability. CVE summarizes:

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, the replay-cache protection mechanism is ineffective for v2 onion services, aka TROVE-2017-009. An attacker can send many INTRODUCE2 cells to trigger this issue.

The bug was discovered 12/01/2017. The weakness was disclosed 12/01/2017 as TROVE-2017-009 as confirmed blog post (Website). The advisory is available at blog.torproject.org. The blog post contains:

There are new stable releases today, fixing the following security issues.
This vulnerability is handled as CVE-2017-8819 since 05/07/2017. 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 T1068 by the MITRE ATT&CK project.

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 170589 (OpenSUSE Security Update for tor (openSUSE-SU-2017:3203-1)).

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). The entries VDB-110163, VDB-110164, VDB-110165 and VDB-110166 are pretty similar. If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Type

Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.4
VulDB Meta Temp Score: 7.2

VulDB Base Score: 7.3
VulDB Temp Score: 7.0
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

Class: Access control
CWE: CWE-284 / CWE-266
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-2017-009
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2017-8819 (🔍)
GCVE (CVE): GCVE-0-2017-8819
GCVE (VulDB): GCVE-100-110162

OVAL: 🔍
See also: 🔍

Entryinfo

Created: 12/03/2017 15:03
Updated: 12/11/2019 21:14
Changes: 12/03/2017 15:03 (77), 12/11/2019 21:14 (2)
Complete: 🔍
Cache ID: 216::103

If you want to get best quality of vulnerability data, you may have to visit VulDB.

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