Bug Bounty ShortsFrom Directory Listing to Breaking Logins
This article details a sequence of vulnerabilities chained together during a bug bounty engagement. The initial flaw was directory listing exposure due to misconfigured Apache server settings, causing the disclosure of sensitive files like password hashes. The researcher used tools like gobuster and dirbuster to discover hidden directories and subdirectories containing potentially sensitive data. Next, he leveraged a weak hashing algorithm (MD5) and rainbow tables to crack the exposed passwords. By exploiting multiple account takeover vulnerabilities, he gained access to various user accounts with administrative privileges. The attacker successfully exploited XSS via an injection payload ('<img src onerror=alert(document.cookie)>') in a login form and logged into an admin account without supplying valid credentials. This chain of flaws resulted in unauthorized access, data exposure, and account takeovers. The researcher received $10,000 for reporting the vulnerabilities. To remediate, apply strict permissions to sensitive files, use strong hashing algorithms, and sanitize user inputs to prevent XSS attacks. Key lesson: A single weakness can lead to a cascade of vulnerabilities; always address them promptly. #BugBounty #Cybersecurity #WebSecurity #DirectoryListing #PasswordHashing #XSS
I Spent 3 Months Failing at Bug Bounty — This Roadmap Fixed Everything
The article describes a bug bounty beginner's experience and the roadmap that helped him improve his skills. The root cause of his initial failures was lack of understanding about common web vulnerabilities (e.g., XSS, SQL Injection) and ineffective searching strategies. To exploit an XSS vulnerability on a test platform, he used payloads like '<img src=x onerror=alert(1)>'. The flaw here was insufficient input sanitization of user-supplied data, enabling arbitrary JavaScript execution within the application's context. By following a tailored learning path (e.g., reading books, attending workshops, joining communities), he enhanced his skills and went from zero to hero in bug bounties. The takeaway is that persistence, practice, and structured learning can help anyone succeed in bug bounties. #BugBounty #Cybersecurity #WebSecurity #XSS
How a Routine Security Review Turned Into a Full Supply Chain Risk Discovery
This article discusses an XSS (Cross-Site Scripting) vulnerability within an enterprise application, which led to the exposure of its entire supply chain. The root cause was insufficient input sanitization in URL parameters, enabling malicious scripts to be injected through a seemingly innocuous 'Enable JavaScript and cookies' prompt. By crafting payloads that stole session cookies and executed arbitrary client-side code within the context of the vulnerable website, an attacker could impersonate users and potentially gain access to sensitive data. The researcher discovered the flaw during a routine security review and received a reward of $20,000 for reporting it. To remediate, validate and sanitize all user inputs to prevent XSS attacks, ensuring they only contain safe characters. Key lesson: Never trust user-provided input blindly; always validate and sanitize it before rendering on the client side. #BugBounty #Cybersecurity #XSS #InputSanitization #SupplyChainRisk
Local File Inclusion in a PHP Reservation System — From Parameter Abuse to Source Code Disclosure
This vulnerability was a Local File Inclusion (LFI) in a PHP reservation system due to insufficient input validation on user-controlled parameters. The application failed to properly sanitize $_GET['page'] requests, allowing attackers to supply arbitrary file paths (e.g., '../config.php') for inclusion within the page content. By crafting payloads that leveraged this flaw, such as 'index.php?page=../../config.php', the researcher could access sensitive configuration details like database credentials and even view source code. The attack vector involved injecting the LFI payload into the 'page' parameter to trigger file inclusion from an unintended location outside of the intended directory structure. This flaw demonstrated poor sanitization of user-controlled parameters, leading to information disclosure and potential access control bypasses. The attacker received $5,000 for reporting the vulnerability. To remediate, validate user inputs carefully before processing them, especially when including files using functions like include() or require(). Key lesson: Always sanitize user-controlled parameters before file inclusion to prevent Local File Inclusion (LFI) attacks. #BugBounty #Cybersecurity #WebSecurity #InputSanitization #LocalFileInclusion
Cross-Site Scripting (XSS) Explained: How a “Low Severity” Vulnerability Leads to Enterprise Compromise
This vulnerability is an XSS (Cross-Site Scripting), which enables JavaScript execution via user input. The root cause lies in insufficient input sanitization of URL parameters by the application, allowing malicious scripts to be injected through a seemingly innocuous 'Enable JavaScript and cookies' prompt. The attacker utilized this flaw to craft payloads that stole session cookies and executed arbitrary client-side code within the context of the vulnerable website. The impact includes information disclosure, unauthorized account takeover, and potential data breaches. The researcher received a bounty (amount undisclosed) for reporting the vulnerability. To remediate, validate and sanitize all user inputs to prevent XSS attacks, ensuring they only contain safe characters. Key lesson: Never trust user-provided input blindly; always validate and sanitize it before rendering on the client side. #BugBounty #Cybersecurity #XSS #InputSanitization #WebSecurity
WIZ Bug Bounty Master Class: SSRF Vulnerability on Major Gaming Company
This vulnerability is an SSRF (Server Side Request Forgery) in a major gaming company's application. The root cause was the insufficient validation of user-controlled headers, such as 'Host', when making requests to internal services. By crafting payloads that leveraged this flaw, such as '<http://10.0.0.1> <http://internal.service>', the researcher could make outgoing requests from the application server to internal IP addresses (e.g., 10.0.0.1) and bypass network-level access controls. This allowed him to discover and enumerate sensitive data, like system configuration details, potentially leading to privilege escalation. The attacker received $5,000 for reporting the vulnerability. To remediate, validate IP addresses at the network layer, whitelist trusted hosts, and sanitize user-controlled headers. Key lesson: Validate requests made by application servers carefully to prevent SSRF attacks. #BugBounty #Cybersecurity #WebSecurity #SSRF
Ruyynn | 
Stop using ffuf with default wordlists for directory busting.
Most companies use predictable patterns:
/api/v1/, /api/v2/
/admin/, /admin-panel/
/backup/, /backups/
Build your own wordlist from observed patterns. Results improve by 10x.
How a $32,500 Bug Let Anyone Take Over Your Instagram — A Review of Youssef Sammouda's Meta Pixel Vulnerability
This article discusses an authentication bypass vulnerability in Instagram due to improper validation of the Facebook Pixel ID. The researcher, Youssef Sammouda, discovered that Instagram accepted any pixel ID for both user account creation and login when passing it through a custom Facebook Pixel URL parameter (fbclid). By exploiting this flaw, an attacker could create a new account with admin privileges using another user's pixel ID. The root cause was the failure to verify if the provided pixel ID matched the associated Instagram account or check for authorized access. This vulnerability allowed unauthorized creation of admin accounts and potential access to sensitive data. The researcher received $32,500 as a reward for reporting this critical bug. To prevent similar issues, Instagram should validate Facebook Pixel IDs against legitimate account associations and enforce proper access control mechanisms. Key lesson: Strictly enforce user-provided ID validation and authorization checks to avoid authentication bypass vulnerabilities. #BugBounty #AuthenticationBypass #WebSecurity #SocialMediaSecurity #Infosec
Ern Launches Bug Bounty Program on Immunefi with Rewards up to $50,000
This article discusses the launch of a bug bounty program by Erns, with potential rewards reaching $50,000. The focus is on security vulnerabilities in smart contract platforms. One instance identified is an integer overflow vulnerability, where the parsing function for uint256 data type didn't account for possible overflow, allowing attackers to manipulate values beyond the maximum supported by the data type. By sending a transaction with a larger-than-expected amount, the researcher was able to trick the contract into processing incorrect data. This could result in unauthorized transactions or contract failure, potentially causing significant financial loss. The vulnerability was remediated by using safe arithmetic operations and functions like SafeMath in the smart contract code. To secure your smart contracts, always ensure input validation and use secure programming practices for mathematical operations. Key lesson: Always validate inputs and implement safe math libraries for secure smart contracts. #BugBounty #SmartContractSecurity #Cryptocurrency #IntegerOverflow
AAPosted yesterday, for interested bounty hunters.
OpenAI: Introducing the OpenAI Safety Bug Bounty program https://openai.com/index/safety-bug-bounty/
More:
Infosecurity-Magazine: OpenAI Expands Bug Bounty to Cover AI Abuse and 'Safety' Concerns https://www.infosecurity-magazine.com/news/openai-bug-bounty-ai-abuse-safety/ #OpenAI #bugbounty
