Ahsan Sheikh (@SnShyk) header
Ahsan Sheikh (@SnShyk) profile picture

Bug Hunter | Synack Red Team Member | Security Consultant | CEH

Joined March 2020
Photo by Ahsan Sheikh (@SnShyk)Photo by Ahsan Sheikh (@SnShyk)Photo by Ahsan Sheikh (@SnShyk)Photo by Ahsan Sheikh (@SnShyk)Photo by Ahsan Sheikh (@SnShyk)Photo by Ahsan Sheikh (@SnShyk)Photo by Ahsan Sheikh (@SnShyk)Photo by Ahsan Sheikh (@SnShyk)Photo by Ahsan Sheikh (@SnShyk)Photo by Ahsan Sheikh (@SnShyk)
Ahsan Sheikh retweeted
5️⃣ Write-up: AWS Document Signing Security Control Bypass Ozgur shares a cool way of abusing application logic to bypass AWS Document Signing! ozguralp.medium.com/write-up…
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Ahsan Sheikh retweeted
3️⃣ We Hacked Apple for 3 Months: Here’s What We Found A classic write-up by 5 talented researchers that briefly talked about their experience hacking Apple for 3 months! samcurry.net/hacking-apple
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This post is logically so do reply with logic #BoycottSushantMehta
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Ahsan Sheikh retweeted
I've made $500k+ from SSRF vulnerabilities. Here are my tricks:
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🇮🇱 Israel is MASSACRING CHILDREN in Gaza. 🚨 The media WILL NOT show you the truth.
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Stop war against children 🇵🇸❤️
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🇵🇸🇮🇱 An Israeli strike hit Palestinian rescue teams in Gaza.
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🇮🇱🇵🇸 The moment Israel BOMBED Gaza’s Baptist Hospital. Over 500 are reported dead. This is a crime against humanity. teapawt.net/WarMonitors/status/171…
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A group of children miraculously survived the Holocaust at the Al-Ahli Arab Hospital after the Nazi Israeli occupation bombed the hospital, resulting in the deaths of 500 martyrs and the injury of 600 other civilians, most of whom were children and women.
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XSS -> ATO Escalation Brain Dump: * Change email -> password reset * Change password * Change phone -> SMS password reset * Change security questions * Add SSO login (login with GitHub, ect) * Force logout -> Session Fixation * Steal session token via non-HTTP only cookie * Steal session token via insecure embed in page * Steal API key for application * Add admin user to organization * Hijack oAuth flow and steal code * Steal SSO code to adjacent app, then reverse SSO back to main app * Add authentication method (SMS, email, etc) * Gain access to refresh token for JWT or session Got any more?
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Ahsan Sheikh retweeted
Found my first RCE on a bb target, probably the best one too :) HTMLi to RCE 🚀 If the backend is python and the application offers a pdf render endpoint there are high chances that they are using reportlab (very popular) to generate those pdfs . POC: github.com/c53elyas/CVE-2023…
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Ahsan Sheikh retweeted
I've earned more than 5-figure bounties from sensitive links, sent via email, that were leaked without any user interaction. Surprisingly, the leaks came from the very security vendors that were supposed to protect the victims. Curious how this happens? 👇 #BugBounty
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Vulnerability accepted! @StateDept Vulnerability: Reflected XSS Tip: Try second or third level URL encoding if application won’t allow you to use simple XSS payload. #infosec #CyberSecurity
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Alhamdulillah ❤️ I and @xshebix did collab on a private target and reported a HIGH severity bug “Account Takeover via Host Header Injection” and got bounty. Also we got bonus for report quality 😎 That was a nice bypass. Thanks @xshebix #bugbountytip #BugBounty #infosec
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Bug bounties in 2023 - extended roadmap 1.1. Common web vulnerabilities Injection attacks 1.1. SQL Injection 1.2. NoSQL Injection 1.3. Command Injection 1.4. LDAP Injection 1.5. XML Injection 1.6. XPath Injection 1.7. Server-Side Template Injection (SSTI) 1.8. Code Injection 1.9. Log Injection 1.10. CRLF Injection Cross-Site Scripting (XSS) 2.1. Stored XSS 2.2. Reflected XSS 2.3. DOM-based XSS Cross-Site Request Forgery (CSRF) Authentication and Authorization attacks 4.1. Broken Authentication 4.2. Broken Access Control 4.3. Privilege Escalation 4.4. Insecure Direct Object Reference (IDOR) 4.5. Missing Authentication for Critical Function 4.6. Password-related attacks 4.6.1. Brute Force attacks 4.6.2. Credential Stuffing 4.6.3. Password Spraying 4.6.4. Dictionary attacks Session Management attacks 5.1. Session Fixation 5.2. Session Hijacking 5.3. Session Timeout Insecure Deserialization Security Misconfiguration Sensitive Data Exposure 8.1. Insecure Storage of Sensitive Data 8.2. Information Leakage and Improper Error Handling 8.3. Insecure Data Transfer Using Components with Known Vulnerabilities Insufficient Logging and Monitoring .... etc 1.2. Reconnaissance techniques - OSINT (Open Source Intelligence) - DNS enumeration - Subdomain discovery 1.3. Exploitation tools - Burp Suite - OWASP ZAP - SQLMap - Nmap 2. Focus on automation Automation can save you valuable time and help you discover vulnerabilities more efficiently. Familiarize yourself with scripting languages like Python or Bash to automate repetitive tasks, such as: 2.1. Subdomain enumeration 2.2. Port scanning 2.3. Web content discovery 2.4. Vulnerability scanning 3. Stay up-to-date with new vulnerabilities and attack techniques The cybersecurity landscape is constantly evolving, and attackers are always finding new ways to exploit systems. Make sure to: 3.1. Follow industry news and blogs 3.2. Attend conferences and workshops 3.3. Participate in online forums and social media discussions 4. Learn from other bug bounty hunters Collaborate and share knowledge with the bug bounty community to learn from others' experiences and improve your skills. Engage in: 4.1. Reading write-ups and case studies 4.2. Watching video tutorials and walkthroughs 4.3. Participating in bug bounty challenges and Capture the Flag (CTF) events 5. Develop a systematic approach to bug hunting To maximize your chances of finding vulnerabilities, follow a systematic approach that covers: 5.1. Reconnaissance and information gathering 5.2. Vulnerability scanning and identification 5.3. Exploitation and proof-of-concept (PoC) development 5.4. Reporting and documentation 6. Practice responsible disclosure When you discover a vulnerability, always follow responsible disclosure guidelines and communicate your findings clearly and professionally. This includes: 6.1. Providing a detailed description of the vulnerability 6.2. Including steps to reproduce the issue 6.3. Suggesting possible mitigations or fixes 6.4. Adhering to the target organization's disclosure policies 7. Build a personal brand A strong personal brand can help you establish credibility in the bug bounty community and attract the attention of potential employers or clients. To build your brand: 7.1. Network with other cybersecurity professionals 7.2. Create a blog or YouTube channel to share your experiences and insights 7.3. Engage with the community on social media platforms like Twitter and LinkedIn
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Failure is a first step towards success 😎 Found CRITICAL security vulnerability in @opensea platform. Unfortunately it got duplicated with another researcher. #bugbounty #nft #hackerone #opensea #infosec
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Just got an appreciation from @_federacy CTO @jsulinski 😃 Thank you so much for the cool private targets and providing such a great bug bounty platform #BugBounty #federacy #infosec #vapt #CyberSecurity
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Alhamdulillah! Best month so far in @Bugcrowd #BugBounty #infosec #penetrationtesting #bugcrowd
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Alhamdulillah! Good Morning with this kind of appreciation and bounty from the program triager. Bug type: Stored XSS bypass to steal Oauth User token and many more sensitive data of user’s Bug Severity: HIGH I’ll publish a writeup soon after fixation of this issue #bugbounty
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