OpenVPN up to 2.3.14/2.4.1 P_CONTROL Packet input validation

CVSS Meta Temp Score
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CTI Interest Score
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6.1$0-$5k0.00

Summaryinfo

A vulnerability classified as problematic was found in OpenVPN up to 2.3.14/2.4.1. Affected by this issue is some unknown functionality of the component P_CONTROL Packet Handler. Executing a manipulation can lead to input validation. This vulnerability is registered as CVE-2017-7478. It is possible to launch the attack remotely. Furthermore, an exploit is available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability classified as problematic was found in OpenVPN up to 2.3.14/2.4.1 (Network Encryption Software). This vulnerability affects an unknown function of the component P_CONTROL Packet Handler. The manipulation with an unknown input leads to a input validation vulnerability. The CWE definition for the vulnerability is 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. As an impact it is known to affect availability. CVE summarizes:

OpenVPN version 2.3.12 and newer is vulnerable to unauthenticated Denial of Service of server via received large control packet. Note that this issue is fixed in 2.3.15 and 2.4.2.

The bug was discovered 05/12/2017. The weakness was published 05/12/2017 with QUARKSLAB as confirmed changelog (Website). The advisory is shared for download at community.openvpn.net. This vulnerability was named CVE-2017-7478 since 04/05/2017. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Technical details are unknown but a public exploit is available.

A public exploit has been developed in Python and been published even before and not after the advisory. It is possible to download the exploit at exploit-db.com. 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 100183 (Fedora 25 : openvpn (2017-0d0f18140a)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Fedora Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 170112 (OpenSUSE Security Update for openvpn (openSUSE-SU-2017:1638-1)).

Upgrading to version 2.3.15 or 2.4.2 eliminates this vulnerability. A possible mitigation has been published 2 days after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Exploit-DB (41993), Tenable (100183), SecurityFocus (BID 98444†) and SecurityTracker (ID 1038473†). Similar entry is available at VDB-101081. VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Type

Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.4
VulDB Meta Temp Score: 6.1

VulDB Base Score: 5.3
VulDB Temp Score: 4.8
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.5
NVD Vector: 🔍

CVSSv2info

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

NVD Base Score: 🔍

Exploitinginfo

Class: Input validation
CWE: CWE-20
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Access: Public
Status: Proof-of-Concept
Programming Language: 🔍
Download: 🔍

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 100183
Nessus Name: Fedora 25 : openvpn (2017-0d0f18140a)
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: 🔍

Exploit-DB: 🔍

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 🔍
05/11/2017 +0 days 🔍
05/11/2017 +0 days 🔍
05/12/2017 +1 days 🔍
05/12/2017 +0 days 🔍
05/12/2017 +0 days 🔍
05/12/2017 +0 days 🔍
05/14/2017 +2 days 🔍
05/15/2017 +1 days 🔍
05/16/2017 +1 days 🔍
04/06/2025 +2882 days 🔍

Sourcesinfo

Advisory: FEDORA-2017-0d0f18140a
Researcher: Quarkslab (funded by OSTIF), Cryptography Engineering LCC
Organization: QUARKSLAB
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2017-7478 (🔍)
GCVE (CVE): GCVE-0-2017-7478
GCVE (VulDB): GCVE-100-101080
SecurityFocus: 98444 - OpenVPN CVE-2017-7478 Denial of Service Vulnerability
OSVDB: - CVE-2017-7478 - OpenVPN - Denial of Service Issue
SecurityTracker: 1038473

scip Labs: https://www.scip.ch/en/?labs.20161013
See also: 🔍

Entryinfo

Created: 05/12/2017 14:14
Updated: 04/06/2025 15:26
Changes: 05/12/2017 14:14 (87), 09/25/2020 14:54 (8), 12/23/2020 09:23 (3), 12/06/2022 10:23 (3), 04/06/2025 15:26 (14)
Complete: 🔍
Cache ID: 216::103

VulDB is the best source for vulnerability data and more expert information about this specific topic.

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