OpenVPN 2.0/2.0 Beta11/2.0.1/2.0.2 options.c foreign_option memory corruption

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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6.6$0-$5k0.00

Summaryinfo

A vulnerability has been found in OpenVPN 2.0/2.0 Beta11/2.0.1/2.0.2 and classified as critical. This affects the function foreign_option of the file options.c. This manipulation causes memory corruption. This vulnerability appears as CVE-2005-3393. There is no available exploit. The affected component should be upgraded.

Detailsinfo

A vulnerability has been found in OpenVPN 2.0/2.0 Beta11/2.0.1/2.0.2 (Network Encryption Software) and classified as critical. Affected by this vulnerability is the function foreign_option of the file options.c. The manipulation with an unknown input leads to a memory corruption vulnerability. The CWE definition for the vulnerability is CWE-119. The product performs operations on a memory buffer, but it can read from or write to a memory location that is outside of the intended boundary of the buffer. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

Format string vulnerability in the foreign_option function in options.c for OpenVPN 2.0.x allows remote clients to execute arbitrary code via format string specifiers in a push of the dhcp-option command option.

The bug was discovered 10/31/2005. The weakness was presented 11/01/2005 by vade79 (Website). It is possible to read the advisory at securityfocus.com. This vulnerability is known as CVE-2005-3393 since 11/01/2005. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details of the vulnerability are known, but there is no available exploit.

It is declared as proof-of-concept. The vulnerability was handled as a non-public zero-day exploit for at least 1 days. During that time the estimated underground price was around $0-$5k. The vulnerability scanner Nessus provides a plugin with the ID 20440 (Mandrake Linux Security Advisory : openvpn (MDKSA-2005:206-1)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Mandriva Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 38485 (OpenVPN Client Remote Format String Vulnerability).

Upgrading eliminates this vulnerability. A possible mitigation has been published 2 months after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at X-Force (22934), Tenable (20440), SecurityFocus (BID 15239†), OSVDB (20415†) and Secunia (SA17376†). See VDB-26772, VDB-26146, VDB-26145 and VDB-26144 for similar entries. Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

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Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
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CVSSv3info

VulDB Meta Base Score: 7.3
VulDB Meta Temp Score: 6.6

VulDB Base Score: 7.3
VulDB Temp Score: 6.6
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

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VulDB Base Score: 🔍
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Exploitinginfo

Class: Memory corruption
CWE: CWE-119
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Proof-of-Concept

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 20440
Nessus Name: Mandrake Linux Security Advisory : openvpn (MDKSA-2005:206-1)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍
Nessus Port: 🔍

OpenVAS ID: 55815
OpenVAS Name: Debian Security Advisory DSA 885-1 (openvpn)
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

Interest: 🔍
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Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

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

Timelineinfo

10/31/2005 🔍
10/31/2005 +0 days 🔍
11/01/2005 +1 days 🔍
11/01/2005 +0 days 🔍
11/01/2005 +0 days 🔍
11/01/2005 +0 days 🔍
11/15/2005 +14 days 🔍
12/09/2005 +24 days 🔍
01/15/2006 +37 days 🔍
03/11/2015 +3342 days 🔍
06/29/2025 +3763 days 🔍

Sourcesinfo

Advisory: securityfocus.com⛔
Researcher: vade79
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2005-3393 (🔍)
GCVE (CVE): GCVE-0-2005-3393
GCVE (VulDB): GCVE-100-26743
X-Force: 22934
SecurityFocus: 15239 - OpenVPN Client Remote Format String Vulnerability
Secunia: 17376 - OpenVPN Format String and Denial of Service Vulnerabilities, Moderately Critical
OSVDB: 20415 - OpenVPN - Client Remote Format String Issue
Vulnerability Center: 9627 - OpenVPN Format String Vulnerability via dhcp-option Command Option, High
Vupen: ADV-2005-2255

See also: 🔍

Entryinfo

Created: 03/11/2015 23:39
Updated: 06/29/2025 02:35
Changes: 03/11/2015 23:39 (75), 06/11/2019 12:13 (10), 06/29/2025 02:35 (20)
Complete: 🔍
Cache ID: 216::103

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