Tor prior 0.2.4.26/0.2.5.11 Packets 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 (≈)
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CTI Interest Score
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6.3$0-$5k0.00

A vulnerability has been found in Tor (Network Encryption Software) and classified as problematic. Affected by this vulnerability is an unknown function of the component Packets Handler. 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 summary by CVE is:

Tor before 0.2.4.26 and 0.2.5.x before 0.2.5.11 does not properly handle pending-connection resolve states during periods of high DNS load, which allows remote attackers to cause a denial of service (assertion failure and daemon exit) via crafted packets.

The weakness was released 04/22/2023 as 14129. The advisory is shared at trac.torproject.org. This vulnerability is known as CVE-2015-2689 since 03/24/2015. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1499 for this issue.

The commercial vulnerability scanner Qualys is able to test this issue with plugin 167701 (OpenSuSE Security Update for tor (openSUSE-SU-2015:0600-1)).

Upgrading to version 0.2.4.26 or 0.2.5.11 eliminates this vulnerability.

Productinfo

Type

Name

License

CPE 2.3info

CPE 2.2info

CVSSv4info

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

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

NVD Base Score: 🔍

Exploitinginfo

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

Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: Tor 0.2.4.26/0.2.5.11

Timelineinfo

03/24/2015 🔍
04/21/2023 +2950 days 🔍
04/22/2023 +0 days 🔍
11/27/2024 +585 days 🔍

Sourcesinfo

Advisory: 14129
Status: Confirmed

CVE: CVE-2015-2689 (🔍)

Entryinfo

Created: 04/22/2023 12:58 AM
Updated: 11/27/2024 09:55 AM
Changes: 04/22/2023 12:58 AM (56), 11/27/2024 09:55 AM (17)
Complete: 🔍
Cache ID: 18:119:40

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