#VU21269 Reflected cross-site scripting in iCMS - CVE-2019-11427

Vulnerability identifier: #VU21269

Vulnerability risk: Low

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

CVE-ID: CVE-2019-11427

CWE-ID: CWE-79

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
iCMS
Web applications / CMS

Vendor: iCMS

Description

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

The vulnerability exists due to insufficient sanitization of user-supplied data passed via the "public/api.php?app=search" q parameter to the "app/search/search.app.php" file. 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.

PoC:

http://[host]/public/api.php?app=search&q=admin%27l0cub%2522autofocus%0aonfocus%01%253dconfirm(1)%20%253d%2522b%2522alzbk

Mitigation
Install updates from vendor's website.

Vulnerable software versions

iCMS: 7.0.0 - 7.0.15

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External links
https://github.com/idreamsoft/iCMS/issues/64
https://github.com/idreamsoft/iCMS/commit/387b37ccf35afcb14d478d644011c8ecd101c3a4

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