XSS in Checkmk

1) Cross-site scripting

EUVDB-ID: #VU65665

Risk: Medium

CVSSv3.1: 5.3 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-28919

CWE-ID: CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Exploit availability: No

Description

The disclosed vulnerability allows a remote attacker to perform cross-site scripting (XSS) attacks.

The vulnerability exists due to insufficient sanitization of user-supplied data. A remote attacker can trick the victim to follow a specially crafted link and execute arbitrary HTML and script code in user's browser in context of vulnerable website.

Successful exploitation of this vulnerability may allow a remote attacker to steal potentially sensitive information, change appearance of the web page, perform phishing and drive-by-download attacks.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Checkmk: 1.6.0 - 1.6.0 p18

External links

http://checkmk.com/check_mk-werks.php?werk_id=11501
http://emacsninja.com/posts/cve-2020-28919-stored-xss-in-checkmk-160p18.html
http://github.com/tribe29/checkmk/commit/c00f450f884d8a229b7d8ab3f0452ed802a1ae04
http://github.com/tribe29/checkmk/commit/e7fd8e4c90be490e4293ec91804d00ec01af5ca6

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.