#VU12660 Authentication bypass in GPON - CVE-2018-10561
Published: May 15, 2018 / Updated: June 17, 2021
Vulnerability identifier: #VU12660
Vulnerability risk: Critical
CVSSv4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:A/U:Red
CVE-ID: CVE-2018-10561
CWE-ID: CWE-592
Exploitation vector: Remote access
Exploit availability:
The vulnerability is being exploited in the wild
Vulnerable software:
GPON
GPON
Software vendor:
Dasan Networks
Dasan Networks
Description
The vulnerability allows a remote attacker to bypass authentication on the target system.
The weakness exists due to improper authentication restrictions. A remote attacker can bypass authentication simply by appending "?images" to any URL of the device that requires authentication, as demonstrated by the /menu.html?images/ or /GponForm/diag_FORM?images/ URI.
Note: the vulnerability is being exploited by various attachers to deliver several Mirai variants (e.g., Satori, JenX, etc.).
The weakness exists due to improper authentication restrictions. A remote attacker can bypass authentication simply by appending "?images" to any URL of the device that requires authentication, as demonstrated by the /menu.html?images/ or /GponForm/diag_FORM?images/ URI.
Note: the vulnerability is being exploited by various attachers to deliver several Mirai variants (e.g., Satori, JenX, etc.).
Remediation
Install update from vendor's website.