CVE-2019-20457: Critical severity brother mfc-j491dw vulnerability
An issue was discovered on Brother MFC-J491DW C1806180757 devices. The printer's web-interface password hash can be retrieved without authentication, because the response header of any failed login attempt returns an incomplete authorization cookie. The value of the authorization cookie is the MD5 hash of the password in hexadecimal. An attacker can easily derive the true MD5 hash from this, and use offline cracking attacks to obtain administrative access to the device.
Affected Software
Event History
Frequently Asked Questions
What is the severity of CVE-2019-20457?
CVE-2019-20457 is considered a medium-severity vulnerability due to its potential to expose sensitive information.
How do I fix CVE-2019-20457?
To fix CVE-2019-20457, update the printer's firmware to the latest version provided by Brother.
What type of devices are affected by CVE-2019-20457?
CVE-2019-20457 specifically affects Brother MFC-J491DW printers.
What does CVE-2019-20457 exploit?
CVE-2019-20457 exploits the printer's web interface, allowing unauthorized access to password hashes.
Is authentication required to exploit CVE-2019-20457?
No, CVE-2019-20457 can be exploited without any authentication due to a flaw in the response headers on failed login attempts.