Vulnerability Monitor

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CVE-2018-9336

openvpnserv.exe (aka the interactive service helper) in OpenVPN 2.4.x before 2.4.6 allows a local attacker to cause a double-free of memory by sending a malformed request to the interactive service. This could cause a denial-of-service through memory corruption or possibly have unspecified other impact including privilege escalation.

Security Impact Summary

This vulnerability carries a HIGH severity rating with a CVSS v3.1 score of 7.8, requiring local system access to exploit with relatively low complexity without requiring user interaction requiring only low-level privileges . The vulnerability impacts confidentiality (data exposure), integrity (unauthorized modifications), and availability (service disruption) for affected systems. Impacting 2 products from openvpn, from slackware organizations running these solutions should prioritize assessment and patching.

Historical Context

First disclosed in 2018, this vulnerability was reported during a period defined by widespread IoT adoption challenges, mobile security concerns, and the emergence of advanced persistent threat (APT) techniques. Contemporary mitigation strategies focused on secure development practices and third-party component vetting.

Published

2018-05-01T18:29:00.697

Last Modified

2024-11-21T04:15:21.590

Status

Modified

Source

[email protected]

Severity

CVSSv3.0: 7.8 (HIGH)

CVSSv2 Vector

AV:L/AC:L/Au:N/C:P/I:P/A:P

Access Vector: LOCAL
Access Complexity: LOW
Authentication: NONE
Confidentiality Impact: PARTIAL
Integrity Impact: PARTIAL
Availability Impact: PARTIAL

Exploitability Score

3.9

Impact Score

6.4

Weaknesses

Type: Primary
CWE-415

Affected Vendors & Products

Type	Vendor	Product	Version/Range	Vulnerable?
Application	openvpn	openvpn	< 2.4.6	Yes
Operating System	slackware	slackware_linux	13.0	Yes
Operating System	slackware	slackware_linux	13.1	Yes
Operating System	slackware	slackware_linux	13.37	Yes
Operating System	slackware	slackware_linux	14.0	Yes
Operating System	slackware	slackware_linux	14.1	Yes

References

http://www.slackware.com/security/viewer.php?l=slackware-security&y=2018&m=slackware-security.568761 Mailing List, Third Party Advisory ([email protected])
https://community.openvpn.net/openvpn/wiki/ChangesInOpenvpn24 Release Notes, Vendor Advisory ([email protected])
https://github.com/OpenVPN/openvpn/commit/1394192b210cb3c6624a7419bcf3ff966742e79b Patch, Third Party Advisory ([email protected])
https://github.com/OpenVPN/openvpn/releases/tag/v2.4.6 Release Notes, Third Party Advisory ([email protected])
https://www.tenable.com/security/research/tra-2018-09 Exploit, Third Party Advisory ([email protected])
http://www.slackware.com/security/viewer.php?l=slackware-security&y=2018&m=slackware-security.568761 Mailing List, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://community.openvpn.net/openvpn/wiki/ChangesInOpenvpn24 Release Notes, Vendor Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://github.com/OpenVPN/openvpn/commit/1394192b210cb3c6624a7419bcf3ff966742e79b Patch, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://github.com/OpenVPN/openvpn/releases/tag/v2.4.6 Release Notes, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://www.tenable.com/security/research/tra-2018-09 Exploit, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)

How SecUtils Interprets This CVE

SecUtils normalizes and enriches National Vulnerability Database (NVD) records by standardizing vendor and product identifiers, aggregating vulnerability metadata from both NVD and MITRE sources, and providing structured context for security teams. For openvpn's affected products, we extract Common Platform Enumeration (CPE) data, Common Weakness Enumeration (CWE) classifications, CVSS severity metrics, and reference data to enable rapid vulnerability prioritization and asset correlation. This record contains no exploit code, proof-of-concept instructions, or attack methodologies—only defensive intelligence necessary for patch management, risk assessment, and security operations.