Tor 0.2.4.12-alpha Directory Authority dirserv.c router_counts_toward_thresholds denial of service

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.
6.7	$0-$5k	0.00

Summaryinfo

A vulnerability has been found in Tor 0.2.4.12-alpha and classified as problematic. Impacted is the function router_counts_toward_thresholds of the file dirserv.c of the component Directory Authority. This manipulation causes denial of service. Furthermore, an exploit is available. The affected component should be upgraded.

Detailsinfo

A vulnerability classified as critical was found in Tor 0.2.4.12-alpha (Network Encryption Software). Affected by this vulnerability is the function router_counts_toward_thresholds of the file dirserv.c of the component Directory Authority. The manipulation with an unknown input leads to a denial of service vulnerability. The CWE definition for the vulnerability is CWE-404. The product does not release or incorrectly releases a resource before it is made available for re-use. As an impact it is known to affect availability.

The weakness was published 05/05/2013 as #8833 as confirmed ticket (Website). The advisory is shared at trac.torproject.org. The ticket contains:

Looks like router_counts_toward_thresholds is calling dirserv_query_measured_bw_cache_kb with a bogus identity, probably because the node's ri field isn't set.

The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details and also a public exploit are known.

After immediately, there has been an exploit disclosed. It is declared as proof-of-concept. We expect the 0-day to have been worth approximately $5k-$25k.

Upgrading to version 0.2.4.13-alpha eliminates this vulnerability. The upgrade is hosted for download at gitweb.torproject.org. A possible mitigation has been published 2 months after the disclosure of the vulnerability.

The vulnerability is also documented in the vulnerability database at OSVDB (101507†). Similar entries are available at VDB-11668, VDB-11667, VDB-11666 and VDB-11664. Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Type

Network Encryption Software

Name

Version

0.2.4.12-alpha

License

open-source

CPE 2.3info

🔍

CPE 2.2info

🔍

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.5
VulDB Meta Temp Score: 6.7

VulDB Base Score: 7.5
VulDB Temp Score: 6.7
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

AV	AC	Au	C	I	A
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳
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Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Class: Denial of service
CWE: CWE-404
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Access: Public
Status: Proof-of-Concept
Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

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

Upgrade: Tor 0.2.4.13-alpha

Timelineinfo

05/05/2013 🔍
05/05/2013 +0 days 🔍
06/14/2013 +40 days 🔍
12/30/2013 +199 days 🔍
03/24/2019 +1910 days 🔍

Sourcesinfo

Advisory: #8833
Status: Confirmed

GCVE (VulDB): GCVE-100-11665
OSVDB: 101507

scip Labs: https://www.scip.ch/en/?labs.20161013
See also: 🔍

Entryinfo

Created: 12/30/2013 11:32
Updated: 03/24/2019 08:46
Changes: 12/30/2013 11:32 (52), 03/24/2019 08:46 (2)
Complete: 🔍
Cache ID: 216::103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.