Stored XSS in Hostel plugin for WordPress

1) Stored cross-site scripting

EUVDB-ID: #VU18616

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: N/A

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

Exploit availability: No

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 "contact_name" and "contact_phone" HTTP POST parameters to "/wp-admin/admin-ajax.php" script. A remote unauthenticated  attacker can permanently store and execute arbitrary HTML and script code in user's browser in context of vulnerable website, when the website administrator visits a booking page.

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 updates from vendor's website.

Vulnerable software versions

Hostel: 0.5.9 - 1.1.3

External links

http://docs.google.com/document/d/1lBnwTY82_UO9XLmoaH3mD9AF-GZ0TPQ_dNKEymDCxzY/edit
http://plugins.trac.wordpress.org/changeset/2094560/hostel

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.