CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
6.3	$0-$5k	0.00

A vulnerability was found in Tor up to 0.2.9.14/0.3.1.9/0.3.2.9 (Network Encryption Software). It has been rated as problematic. This issue affects an unknown code of the component directory-authority protocol-list Subprotocol. The manipulation with an unknown input leads to a null pointer dereference vulnerability. Using CWE to declare the problem leads to CWE-476. A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit. Impacted is availability. The summary by CVE is:

An issue was discovered in Tor before 0.2.9.15, 0.3.1.x before 0.3.1.10, and 0.3.2.x before 0.3.2.10. The directory-authority protocol-list subprotocol implementation allows remote attackers to cause a denial of service (NULL pointer dereference and directory-authority crash) via a misformatted relay descriptor that is mishandled during voting.

The bug was discovered 03/03/2018. The weakness was presented 03/05/2018 (Website). It is possible to read the advisory at blog.torproject.org. The identification of this vulnerability is CVE-2018-0490 since 11/27/2017. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. The technical details are unknown and an exploit is not publicly available.

The vulnerability was handled as a non-public zero-day exploit for at least 2 days. During that time the estimated underground price was around $5k-$25k. The vulnerability scanner Nessus provides a plugin with the ID 109412 (Debian DSA-4183-1 : 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 170913 (OpenSUSE Security Update for tor (openSUSE-SU-2018:0614-1)).

Upgrading to version 0.2.9.15, 0.3.1.10 or 0.3.2.10 eliminates this vulnerability. A possible mitigation has been published 2 months after the disclosure of the vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (109412). See 114084 for similar entry.

Productinfo

Type

• Network Encryption Software

Name

• Tor

Version

• 0.2.9.0
• 0.2.9.1
• 0.2.9.2
• 0.2.9.3
• 0.2.9.4
• 0.2.9.5
• 0.2.9.6
• 0.2.9.7
• 0.2.9.8
• 0.2.9.9
• 0.2.9.10
• 0.2.9.11
• 0.2.9.12
• 0.2.9.13
• 0.2.9.14
• 0.3.1.0
• 0.3.1.1
• 0.3.1.2
• 0.3.1.3
• 0.3.1.4
• 0.3.1.5
• 0.3.1.6
• 0.3.1.7
• 0.3.1.8
• 0.3.1.9
• 0.3.2.0
• 0.3.2.1
• 0.3.2.2
• 0.3.2.3
• 0.3.2.4
• 0.3.2.5
• 0.3.2.6
• 0.3.2.7
• 0.3.2.8
• 0.3.2.9

License

• open-source

CPE 2.3info

• 🔍
• 🔍
• 🔍

CPE 2.2info

• 🔍
• 🔍
• 🔍

CVSSv4info

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

CVSSv3info

VulDB Meta Base Score: 6.4
VulDB Meta Temp Score: 6.3

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.5
NVD Vector: 🔍

CVSSv2info

AV	AC	Au	C	I	A
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
unlock	unlock	unlock	unlock	unlock	unlock
unlock	unlock	unlock	unlock	unlock	unlock
unlock	unlock	unlock	unlock	unlock	unlock

VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Null pointer dereference
CWE: CWE-476 / CWE-404
ATT&CK: Unknown

Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	unlock	unlock	unlock	unlock
Today	unlock	unlock	unlock	unlock

Nessus ID: 109412
Nessus Name: Debian DSA-4183-1 : tor - security update
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 861031
OpenVAS Name: Debian Security Advisory DSA 4183-1 (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 0.2.9.15/0.3.1.10/0.3.2.10

Timelineinfo

11/27/2017 🔍
03/03/2018 +96 days 🔍
03/05/2018 +2 days 🔍
03/05/2018 +0 days 🔍
03/06/2018 +1 days 🔍
04/28/2018 +53 days 🔍
04/30/2018 +2 days 🔍
02/16/2023 +1753 days 🔍

Sourcesinfo

Advisory: 25074
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2018-0490 (🔍)
OVAL: 🔍
See also: 🔍

Entryinfo

Created: 03/06/2018 07:51
Updated: 02/16/2023 23:04
Changes: 03/06/2018 07:51 (76), 01/10/2020 15:20 (3), 02/16/2023 23:04 (4)
Complete: 🔍

Discussion

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