Web Security Series #14 — Blind Command Injection Exploitation
This article discusses a Blind Command Injection (BCI) vulnerability in an unnamed web application. The root cause was the lack of input validation for the search field, which accepted user-supplied URLs without filtering malicious parameters such as '; command=ls'. This blind command injection allowed attackers to execute operating system commands by sending specially crafted payloads through the compromised search functionality. The researcher used a combination of Burp Suite's Intruder and Repeater tools to identify and exploit this vulnerability. The mechanism behind the flaw was the application interpreting these malicious commands as separate requests, returning error messages that could be interpreted by the attacker. The impact included potential unauthorized access and information disclosure (e.g., listing files using 'ls' command). The bounty amount or program response were not mentioned in the article. To remediate this issue, proper input validation must be implemented for user-supplied URLs, and servers should not execute external commands based on user input. Key lesson: Input validation is crucial for preventing Blind Command Injection attacks #BugBounty #WebSecurity #CommandInjection #InputValidation #Infosec

https://medium.com/@laibakashif0011/web-security-series-14-blind-command-injection-exploitation-c307820b6748?source=rss------bug_bounty-5