SB2021101102 - Multiple vulnerabilities in Firefly III

Description

This security bulletin contains information about 2 vulnerabilities.

1) Open redirect (CVE-ID: N/A)

CWE-ID: CWE-601 - URL Redirection to Untrusted Site ('Open Redirect')

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

The vulnerability allows a remote attacker to redirect victims to arbitrary URL.

The vulnerability exists due to improper sanitization of user-supplied data. A remote attacker can create a link that leads to a trusted website, however, when clicked, redirects the authenticated victim to arbitrary domain.

Successful exploitation of this vulnerability may allow a remote attacker to perform a phishing attack and steal potentially sensitive information.

2) Arbitrary file upload (CVE-ID: N/A)

CWE-ID: CWE-434 - Unrestricted Upload of File with Dangerous Type

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P/U:Amber

The vulnerability allows a remote attacker to compromise vulnerable system.

The vulnerability exists due to insufficient validation of file during file upload while creating a new bill. A remote attacker can upload a malicious file and execute it on the server.

Remediation

Install update from vendor's website.

References

• https://github.com/firefly-iii/firefly-iii/releases/tag/5.6.2
• https://huntr.dev/bounties/549a1040-9b5e-420b-9b80-20700dd9d592/
• https://huntr.dev/bounties/5267ec1c-d204-40d2-bd4f-6c2dd495ee18/