Vulnerability identifier: #VU18412

Vulnerability risk: Medium

CVSSv3.1: 4.7 [CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2019-11454

CWE-ID: CWE-79

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Tildeslash Monit
Web applications / Remote management & hosting panels

Vendor: Atlassian

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. The vulnerability allows a remote authenticated attacker to inject arbitrary JavaScript via  user field of the Authorization header for HTTP Basic Authentication and execute it during an "_viewlog" operation.

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

Tildeslash Monit: 5.7 - 5.25.2

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External links
http://bitbucket.org/tildeslash/monit/commits/1a8295eab6815072a18019b668fe084945b751f3
http://bitbucket.org/tildeslash/monit/commits/328f60773057641c4b2075fab9820145e95b728c
http://github.com/dzflack/exploits/blob/master/unix/monit_xss.py
http://lists.debian.org/debian-lts-announce/2019/04/msg00028.html
http://usn.ubuntu.com/3971-1/

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

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