#VU47356 Stored cross-site scripting in Zabbix - CVE-2020-15803

Vulnerability identifier: #VU47356

Vulnerability risk: Medium

CVSSv4.0: 2 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:P/U:Green]

CVE-ID: CVE-2020-15803

CWE-ID: CWE-79

Exploitation vector: Network

Exploit availability: Yes

Vulnerable software:
Zabbix
Server applications / Remote management servers, RDP, SSH

Vendor: Zabbix

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 in the URL Widget. A remote attacker can permanently inject 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

Zabbix: 4.0.3 rc2 - 4.0.25, 4.4.0 rc1 - 4.4.10, 5.0.0 rc1 - 5.0.4

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External links
https://lists.opensuse.org/opensuse-security-announce/2020-10/msg00007.html
https://lists.debian.org/debian-lts-announce/2020/08/msg00007.html
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/2ZHHIUYIVA5GZYLKW6A5G6HRELPOBZFE/
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/TIRIMOXH6GSBAANDCB3ANLJK4CRLWRXT/
https://support.zabbix.com/browse/ZBX-18057

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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. However, proof of concept for this vulnerability is available.