Cross-site scripting in Fortinet, FortiOS

1) Cross-site scripting

EUVDB-ID: #VU40794

Risk: Low

CVSSv3.1: 4.6 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2015-1880

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

Exploit availability: No

Description

Vulnerability allows a remote attacker to perform XSS attacks.

The vulnerability is caused by an input validation error in the sslvpn login page in Fortinet FortiOS 5.2.x before 5.2.3. A remote attacker can trick the victim to follow a specially crafted link and execute arbitrary HTML and script code in victim's browser in security 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

FortiOS: 5.2.0 - 5.2.2

External links

http://www.fortiguard.com/advisory/FG-IR-15-005/
http://www.securityfocus.com/bid/74652
http://www.securitytracker.com/id/1032261
http://www.securitytracker.com/id/1032262
http://www.securitytracker.com/id/1032264
http://www.securitytracker.com/id/1032265

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.