OpenVPN up to 2.0.0 memory allocation

CVSS Meta Temp Score
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CTI Interest Score
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3.8$0-$5k0.00

Summaryinfo

A vulnerability was found in OpenVPN up to 2.0.0. It has been rated as problematic. This impacts an unknown function. Performing a manipulation results in memory allocation. This vulnerability is known as CVE-2005-2533. No exploit is available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability classified as problematic has been found in OpenVPN up to 2.0.0 (Network Encryption Software). This affects an unknown function. The manipulation with an unknown input leads to a memory allocation vulnerability. CWE is classifying the issue as CWE-789. The product allocates memory based on an untrusted, large size value, but it does not ensure that the size is within expected limits, allowing arbitrary amounts of memory to be allocated. This is going to have an impact on availability. The summary by CVE is:

OpenVPN before 2.0.1, when running in "dev tap" Ethernet bridging mode, allows remote authenticated clients to cause a denial of service (memory exhaustion) via a flood of packets with a large number of spoofed MAC addresses.

The bug was discovered 08/19/2005. The weakness was published 08/24/2005 (Website). The advisory is shared at mandriva.com. This vulnerability is uniquely identified as CVE-2005-2533 since 08/10/2005. The exploitability is told to be easy. An attack has to be approached locally. No form of authentication is needed for exploitation. Neither technical details nor an exploit are publicly available.

The vulnerability scanner Nessus provides a plugin with the ID 21391 (FreeBSD : openvpn -- denial of service: malicious authenticated 'tap' client can deplete server virtual memory (1986449a-8b74-40fa-b7cc-0d8def8aad65)), 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 38464 (OpenVPN MAC Address Spoofing 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 (21928), Tenable (21391), SecurityFocus (BID 14608†), OSVDB (18884†) and Secunia (SA16463†). Similar entries are available at VDB-26772, VDB-26743, VDB-26146 and VDB-26144. Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Type

Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.0
VulDB Meta Temp Score: 3.8

VulDB Base Score: 4.0
VulDB Temp Score: 3.8
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Memory allocation
CWE: CWE-789 / CWE-400 / CWE-404
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: No

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 21391
Nessus Name: FreeBSD : openvpn -- denial of service: malicious authenticated 'tap' client can deplete server virtual memory (1986449a-8b74-40fa-b7cc-0d8def8aad65)
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 🔍
08/24/2005 +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-2005-2533 (🔍)
GCVE (CVE): GCVE-0-2005-2533
GCVE (VulDB): GCVE-100-26145
X-Force: 21928
SecurityFocus: 14608
Secunia: 16463 - OpenVPN Multiple DoS Vulnerabilities, Moderately Critical
OSVDB: 18884 - CVE-2005-2533 - OpenVPN - Denial-Of-Service Issue
Vulnerability Center: 9117 - OpenVPN <2.0.1 dev tap Ethernet Bridging Mode Packet Flood, Low

See also: 🔍

Entryinfo

Created: 03/11/2015 23:39
Updated: 06/09/2019 09:57
Changes: 03/11/2015 23:39 (72), 06/09/2019 09:57 (7)
Complete: 🔍
Cache ID: 216::103

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

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