Stored cross-site scripting in Firefly III

1) Stored cross-site scripting

EUVDB-ID: #VU19953

Risk: Low

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-2019-14672

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

Exploit availability: No

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 liability name field. A remote attacker can send a specially crafted request, which contains javascript code in it and execute arbitrary HTML and script code during a visit to the account show page 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

Firefly III: 4.7.17.3

External links

http://github.com/firefly-iii/firefly-iii/commit/8717f469b10e9f7e1547c6f70f7d24e1359d28d4
http://github.com/firefly-iii/firefly-iii/issues/2370

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.