CVE-2024-37893
In affected versions an MFA bypass in the Firefly III OAuth flow may allow malicious users to bypass the MFA-check.
Does this matter?
Lower severity and a low EPSS score (0.59%). Track it; it rarely justifies an emergency change on its own.
Description
Firefly III is a free and open source personal finance manager. In affected versions an MFA bypass in the Firefly III OAuth flow may allow malicious users to bypass the MFA-check. This allows malicious users to use password spraying to gain access to Firefly III data using passwords stolen from other sources. As OAuth applications are easily enumerable using an incrementing id, an attacker could try sign an OAuth application up to a users profile quite easily if they have created one. The attacker would also need to know the victims username and password. This problem has been patched in Firefly III v6.1.17 and up. Users are advised to upgrade. Users unable to upgrade should Use a unique password for their Firefly III instance and store their password securely, i.e. in a password manager.
- CVSS 3.1
- 5.9 MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
- EPSS
- 0.59% probability · 47th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-287, CWE-288
- Source
- security-advisories@github.com
References
- https://github.com/firefly-iii/firefly-iii/security/advisories/GHSA-4gm4-c4mh-4p7w
- https://owasp.org/www-community/attacks/Password_Spraying_Attack
- https://www.menlosecurity.com/what-is/highly-evasive-adaptive-threats-heat/mfa-bypass
- https://github.com/firefly-iii/firefly-iii/security/advisories/GHSA-4gm4-c4mh-4p7w
- https://owasp.org/www-community/attacks/Password_Spraying_Attack
- https://www.menlosecurity.com/what-is/highly-evasive-adaptive-threats-heat/mfa-bypass
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.