Vulnerability Details : CVE-2018-7544
A cross-protocol scripting issue was discovered in the management interface in OpenVPN through 2.4.5. When this interface is enabled over TCP without a password, and when no other clients are connected to this interface, attackers can execute arbitrary management commands, obtain sensitive information, or cause a denial of service (SIGTERM) by triggering XMLHttpRequest actions in a web browser. This is demonstrated by a multipart/form-data POST to http://localhost:23000 with a "signal SIGTERM" command in a TEXTAREA element. NOTE: The vendor disputes that this is a vulnerability. They state that this is the result of improper configuration of the OpenVPN instance rather than an intrinsic vulnerability, and now more explicitly warn against such configurations in both the management-interface documentation, and with a runtime warning
Vulnerability category: Denial of service
Products affected by CVE-2018-7544
- cpe:2.3:a:openvpn:openvpn:*:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2018-7544
0.33%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 67 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2018-7544
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
6.4
|
MEDIUM | AV:N/AC:L/Au:N/C:P/I:N/A:P |
10.0
|
4.9
|
NIST | |
|
9.1
|
CRITICAL | CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H |
3.9
|
5.2
|
NIST |
CWE ids for CVE-2018-7544
-
The product uses a function that accepts a format string as an argument, but the format string originates from an external source.Assigned by: nvd@nist.gov (Primary)
References for CVE-2018-7544
-
http://blog.0xlabs.com/2018/03/openvpn-remote-information-disclosure.html
0xlabs | Blog: OpenVPN: Remote Information Disclosure and Denial Of Service (CVE-2018-7544)Exploit;Third Party Advisory
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