OpenVPN up to 2.3.14/2.4.1 Counter Overlow input validation

CVSS Meta Temp Score
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CTI Interest Score
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5.1$0-$5k0.00

Summaryinfo

A vulnerability, which was classified as problematic, has been found in OpenVPN up to 2.3.14/2.4.1. This affects an unknown part of the component Counter. The manipulation leads to input validation (Overlow). This vulnerability is documented as CVE-2017-7479. The attack can be initiated remotely. There is not any exploit available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in OpenVPN up to 2.3.14/2.4.1 (Network Encryption Software). This issue affects an unknown functionality of the component Counter. The manipulation with an unknown input leads to a input validation vulnerability (Overlow). Using CWE to declare the problem leads to CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. Impacted is availability. The summary by CVE is:

OpenVPN versions before 2.3.15 and before 2.4.2 are vulnerable to reachable assertion when packet-ID counter rolls over resulting into Denial of Service of server by authenticated attacker.

The bug was discovered 05/12/2017. The weakness was released 05/12/2017 with QUARKSLAB as confirmed changelog (Website). The advisory is shared at community.openvpn.net. The identification of this vulnerability is CVE-2017-7479 since 04/05/2017. The exploitation is known to be easy. The attack may be initiated remotely. The successful exploitation needs a simple authentication. Neither technical details nor an exploit are publicly available.

The vulnerability scanner Nessus provides a plugin with the ID 100226 (Debian DLA-944-1 : openvpn security update), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Debian Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 196777 (Ubuntu Security Notification for Openvpn Vulnerabilities (USN-3284-1)).

Upgrading to version 2.3.15 or 2.4.2 eliminates this vulnerability. A possible mitigation has been published 4 days after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (100226), SecurityFocus (BID 98443†) and SecurityTracker (ID 1038473†). Entry connected to this vulnerability is available at VDB-101080. 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: 5.4
VulDB Meta Temp Score: 5.3

VulDB Base Score: 4.3
VulDB Temp Score: 4.1
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 6.5
NVD Vector: 🔍

CVSSv2info

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

NVD Base Score: 🔍

Exploitinginfo

Name: Overlow
Class: Input validation / Overlow
CWE: CWE-20
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: 100226
Nessus Name: Debian DLA-944-1 : openvpn security update
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 867773
OpenVAS Name: Fedora Update for openvpn FEDORA-2017-f426acf49d
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

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

Upgrade: OpenVPN 2.3.15/2.4.2

Timelineinfo

04/05/2017 🔍
05/11/2017 +36 days 🔍
05/12/2017 +1 days 🔍
05/12/2017 +0 days 🔍
05/12/2017 +0 days 🔍
05/12/2017 +0 days 🔍
05/15/2017 +3 days 🔍
05/16/2017 +1 days 🔍
05/17/2017 +1 days 🔍
12/23/2020 +1316 days 🔍

Sourcesinfo

Advisory: community.openvpn.net
Researcher: Quarkslab
Organization: QUARKSLAB
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2017-7479 (🔍)
GCVE (CVE): GCVE-0-2017-7479
GCVE (VulDB): GCVE-100-101081

OVAL: 🔍

SecurityFocus: 98443 - OpenVPN CVE-2017-7479 Denial of Service Vulnerability
OSVDB: - CVE-2017-7479 - OpenVPN - Denial of Service Issue
SecurityTracker: 1038473

See also: 🔍

Entryinfo

Created: 05/12/2017 14:14
Updated: 12/23/2020 09:27
Changes: 05/12/2017 14:14 (81), 09/25/2020 12:24 (8), 12/23/2020 09:27 (3)
Complete: 🔍
Cache ID: 216::103

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

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