D-Link DIR-615 T1 20.10 – CAPTCHA Bypass
# Exploit Title: D-Link DIR-615 T1 20.10 - CAPTCHA Bypass # Date: 2019-10-12 # Exploit Author: huzaifa hussain # Vendor Homepage: https://in.dlink.com/ # Version: DIR-615 T1 ver:20.10 # Tested on: D-LINK ROUTER "MODEL NO: DIR-615" with "FIRMWARE VERSION:20.10" & "HARDWARE VERSION:T1 # CVE: CVE-2019-17525 D-LINK ROUTER "MODEL NO: DIR-615" with "FIRMWARE VERSION:20.10" & "HARDWARE VERSION:T1 A vulnerability found on login-in page of D-LINK ROUTER "DIR-615" with "FIRMWARE VERSION:20.10" & "HARDWARE VERSION:T1" which allows attackers to easily bypass CAPTCHA on login page by BRUTEFORCING. ------------------------------------ D-Link released new firmware designed to protect against logging in to the router using BRUTEFORCING. There is a flaw in the captcha authentication system that allows an attacker to reuse the same captcha without reloading new. ATTACK SCENARIO AND REPRODUCTION STEPS 1: Find the ROUTER LoginPage. 2: Fill the required login credentials. 3: Fill the CAPTCH properly and Intercept the request in Burpsuit. 4: Send the Request to Intruder and select the target variables i.e. username & password which will we bruteforce under Positions Tab 5: Set the payloads on target variables i.e. username & password under Payloads Tab. 5: Set errors in (the validatecode is invalid & username or password error, try again) GREP-MATCH under Options Tab. 6: Now hit the start attack and you will find the correct credentials. ------------------------------------- Huzaifa Hussain |