Tor 0.2.2.39 SENDME Cell resource management

CVSS Meta Temp Score
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CTI Interest Score
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6.5$0-$5k0.00

A vulnerability, which was classified as critical, was found in Tor 0.2.2.39 (Network Encryption Software). Affected is an unknown function of the component SENDME Cell Handler. The manipulation with an unknown input leads to a resource management vulnerability. CWE is classifying the issue as CWE-399. This is going to have an impact on availability. CVE summarizes:

The connection_edge_process_relay_cell function in or/relay.c in Tor before 0.2.3.25 maintains circuits even if an unexpected SENDME cell arrives, which might allow remote attackers to cause a denial of service (memory consumption or excessive cell reception rate) or bypass intended flow-control restrictions via a RELAY_COMMAND_SENDME command.

The weakness was shared 11/19/2012 by arma as confirmed changelog entry (Website). The advisory is available at gitweb.torproject.org. The vendor cooperated in the coordination of the public release. This vulnerability is traded as CVE-2012-5573 since 10/24/2012. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. The technical details are unknown and an exploit is not available.

The vulnerability scanner Nessus provides a plugin with the ID 74828 (openSUSE Security Update : tor (openSUSE-SU-2012:1624-1)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family SuSE Local Security Checks.

Upgrading to version 0.2.3.25 eliminates this vulnerability. A possible mitigation has been published immediately after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at X-Force (80289) and Tenable (74828). The entries 7015, 7016 and 7017 are related to this item.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB CVSS-B Score: 🔍
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CVSSv3info

VulDB Meta Base Score: 7.5
VulDB Meta Temp Score: 6.5

VulDB Base Score: 7.5
VulDB Temp Score: 6.5
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

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VulDB Base Score: 🔍
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Exploitinginfo

Class: Resource management
CWE: CWE-399 / CWE-404
ATT&CK: Unknown

Local: No
Remote: Yes

Availability: 🔍
Status: Unproven

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 74828
Nessus Name: openSUSE Security Update : tor (openSUSE-SU-2012:1624-1)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Port: 🔍

OpenVAS ID: 865478
OpenVAS Name: Fedora Update for tor FEDORA-2013-3434
OpenVAS File: 🔍
OpenVAS Family: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

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

Upgrade: Tor 0.2.3.25

Timelineinfo

10/24/2012 🔍
11/19/2012 +26 days 🔍
11/19/2012 +0 days 🔍
11/19/2012 +0 days 🔍
11/19/2012 +0 days 🔍
11/23/2012 +4 days 🔍
11/26/2012 +3 days 🔍
11/26/2012 +0 days 🔍
11/27/2012 +1 days 🔍
01/01/2013 +35 days 🔍
03/25/2013 +83 days 🔍
06/13/2014 +445 days 🔍
04/19/2021 +2502 days 🔍

Sourcesinfo

Advisory: gitweb.torproject.org
Researcher: arma
Status: Confirmed
Confirmation: 🔍
Coordinated: 🔍

CVE: CVE-2012-5573 (🔍)
X-Force: 80289 - Tor SENDME denial of service, Medium Risk
SecurityTracker: 1027813 - Tor SENDME Message Processing Bug Lets Remote Users Deny Service
Vulnerability Center: 38908 - Tor <0.2.3.25 Remote Denial of Service via a RELAY_COMMAND_SENDME Command, Medium
SecurityFocus: 56675 - Tor Remote Denial of Service Vulnerability
Secunia: 51329 - Tor Denial of Service Vulnerability, Moderately Critical
OSVDB: 87651

See also: 🔍

Entryinfo

Created: 11/26/2012 15:30
Updated: 04/19/2021 15:15
Changes: 11/26/2012 15:30 (84), 04/26/2017 17:49 (5), 04/19/2021 15:15 (3)
Complete: 🔍
Committer:

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