Multiple vulnerabilities in pfSense

Published: 2020-04-07 | Updated: 2020-05-04

Risk	Medium
Patch available	YES
Number of vulnerabilities	2
CVE-ID	CVE-2020-11457 CVE-2020-10797
CWE-ID	CWE-79
Exploitation vector	Network
Public exploit	Public exploit code for vulnerability #1 is available.
Vulnerable software Subscribe	pfsense Server applications / IDS/IPS systems, Firewalls and proxy servers
Vendor	Rubicon Communications

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

Updated 04.05.2020

Added vulnerability #2

1) Cross-site scripting

EUVDB-ID: #VU26657

Risk: Medium

CVSSv3.1: 5.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N/E:P/RL:O/RC:C]

CVE-ID: CVE-2020-11457

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

Exploit availability: Yes

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 system_usermanager_addprivs.ph. 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

pfsense: 2.4.0 - 2.4.4_3

External links

http://packetstormsecurity.com/files/157104/pfSense-2.4.4-P3-User-Manager-Cross-Site-Scripting.html
http://github.com/pfsense/pfsense/commit/3c1e53dabe966f27c9097a5a923e77f49ae5fffa
http://www.netgate.com/assets/downloads/advisories/pfSense-SA-20_06.webgui.asc

Q & A

Can this vulnerability be exploited remotely?

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

How the attacker can exploit this vulnerability?

The attacker would have to send a specially crafted request to the affected application in order to exploit this vulnerability.

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.

2) Cross-site scripting

EUVDB-ID: #VU27508

Risk: Low

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-2020-10797