OpenVPN up to 2.0.0 denial of service

CVSS Meta Temp Score
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CTI Interest Score
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3.6$0-$5k0.00

Summaryinfo

A vulnerability categorized as problematic has been discovered in OpenVPN up to 2.0.0. Affected is an unknown function. Executing a manipulation can lead to denial of service. This vulnerability is handled as CVE-2005-2534. There is not any exploit available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability classified as problematic was found in OpenVPN up to 2.0.0 (Network Encryption Software). This vulnerability affects an unknown functionality. 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. CVE summarizes:

Race condition in OpenVPN before 2.0.1, when --duplicate-cn is not enabled, allows remote attackers to cause a denial of service (server crash) via simultaneous TCP connections from multiple clients that use the same client certificate.

The bug was discovered 08/19/2005. The weakness was released 08/24/2005 (Website). The advisory is available at mandriva.com. This vulnerability was named CVE-2005-2534 since 08/10/2005. The exploitation appears to be difficult. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. The technical details are unknown and an exploit is not available.

The vulnerability scanner Nessus provides a plugin with the ID 21433 (FreeBSD : openvpn -- multiple TCP clients connecting with the same certificate at the same time can crash the server (5ad3e437-e527-4514-b9ed-280b2ca1a8c9)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family FreeBSD Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 38465 (OpenVPN Same Client Certificate Denial of Service Vulnerability).

Upgrading to version 2.0.1 eliminates this vulnerability. A possible mitigation has been published even before and not after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at X-Force (21929), Tenable (21433), SecurityFocus (BID 14610†), OSVDB (18885†) and Secunia (SA16463†). Entries connected to this vulnerability are available at VDB-26772, VDB-26743, VDB-26145 and VDB-26144. 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: 3.7
VulDB Meta Temp Score: 3.6

VulDB Base Score: 3.7
VulDB Temp Score: 3.6
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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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: 🔍

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: 21433
Nessus Name: FreeBSD : openvpn -- multiple TCP clients connecting with the same certificate at the same time can crash the server (5ad3e437-e527-4514-b9ed-280b2ca1a8c9)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍
Nessus Port: 🔍

OpenVAS ID: 55602
OpenVAS Name: Debian Security Advisory DSA 851-1 (openvpn)
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: OpenVPN 2.0.1

Timelineinfo

08/10/2005 🔍
08/19/2005 +9 days 🔍
08/19/2005 +0 days 🔍
08/19/2005 +0 days 🔍
08/19/2005 +0 days 🔍
08/24/2005 +5 days 🔍
08/24/2005 +0 days 🔍
08/24/2005 +0 days 🔍
09/11/2005 +18 days 🔍
05/13/2006 +244 days 🔍
03/11/2015 +3224 days 🔍
06/09/2019 +1551 days 🔍

Sourcesinfo

Advisory: mandriva.com
Status: Not defined
Confirmation: 🔍

CVE: CVE-2005-2534 (🔍)
GCVE (CVE): GCVE-0-2005-2534
GCVE (VulDB): GCVE-100-26146
X-Force: 21929
SecurityFocus: 14610 - OpenVPN Same Client Certificate Denial Of Service Vulnerability
Secunia: 16463 - OpenVPN Multiple DoS Vulnerabilities, Moderately Critical
OSVDB: 18885 - OpenVPN - Same Client Certificate Denial Of Service Issue
Vulnerability Center: 9116 - OpenVPN <2.0.1 Race Condition via Multiple Clients with Same Client Certificate, Medium

See also: 🔍

Entryinfo

Created: 03/11/2015 23:39
Updated: 06/09/2019 09:53
Changes: 03/11/2015 23:39 (75), 06/09/2019 09:53 (7)
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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