CVE-2019-20877

An issue was discovered in Mattermost Server before 5.9.0, 5.8.1, 5.7.3, and 4.10.8. It allows attackers to obtain sensitive information about whether someone has 2FA enabled...

CVE-2019-20877

Mattermost Server contains an information-disclosure vulnerability that allows an attacker to determine if a user has 2FA enabled. Affected versions include Mattermost Server before 5.9.0, 5.8.1, 5.7.3, and 4.10.8. The issue is described consistently across CVE sources (including Red Hat), with n...

Glassdoor: 2FA bypass by sending blank code

Summary: █████████. This is a failure in null check of the entered code. In simple terms, the 2FA while logging in can be bypassed by sending a blank code. This could be because of incorrect comparison of entered code with true code. A pre-validation may be null check before comparing the codes...

h1-ctf: [H1-2006 2020] Bounty Pay CTF challenge

H1-2006 2020 Bounty Pay CTF challenge Hi there! This is my H1-2006 CTF writeup submission. First of all, thanks for the great challenge! This was my first H1 CTF that I played. I really enjoyed doing it and I learned new things solving this challenge. In my case, it was the demonstration that I...

CVE-2020-13998

Citrix XenApp 6.5, when 2FA is enabled, allows a remote unauthenticated attacker to ascertain whether a user exists on the server, because the 2FA error page only occurs after a valid username is entered. NOTE: This vulnerability only affects products that are no longer supported by the maintaine...

Code injection

Citrix XenApp 6.5, when 2FA is enabled, allows a remote unauthenticated attacker to ascertain whether a user exists on the server, because the 2FA error page only occurs after a valid username is entered. NOTE: This vulnerability only affects products that are no longer supported by the maintaine...

CVE-2020-13998

Citrix XenApp 6.5, when 2FA is enabled, allows a remote unauthenticated attacker to ascertain whether a user exists on the server, because the 2FA error page only occurs after a valid username is entered. NOTE: This vulnerability only affects products that are no longer supported by the maintaine...

CVE-2020-13998

Citrix XenApp 6.5, when 2FA is enabled, allows a remote unauthenticated attacker to ascertain whether a user exists on the server, because the 2FA error page only occurs after a valid username is entered. NOTE: This vulnerability only affects products that are no longer supported by the maintaine...

CVE-2020-13998

CVE-2020-13998 affects Citrix XenApp 6.5. A remote unauthenticated attacker can determine whether a user exists on the server because the 2FA error page only appears after a valid username is entered. Public sources in the connected documents confirm the issue as an information disclosure affecti...

h1-ctf: [h1-2006 CTF] Multiple vulnerabilities leading to account takeover and two-factor authentication bypass allows to send pending bounty payments

Hi, First things first, the flag of the CTF challenge. F863095 Write-Up I've published my write-up at https://kapytein.nl/texts/2020-06-10-h1-2006-ctf-writeup-2cf34abd3ed/, in order to avoid a lengthy report 😅. TL;DR 1 2FA bypass as we control both values on the comparison. 2 SSRF to...

h1-ctf: [h1-2006 2020] Chained vulnerabilities lead to account takeover

Summary Mårten Mickos lost his account for BountyPay, the new service HackerOne is using to pay bug bounties. In this report I explain how I accessed a customer's account using a log file and bypassed its 2FA validation. I then leverage an open redirect bug to gain access to an internal server an...

h1-ctf: [H1-2006 2020] Bypassing access control checks by modifying the URL, internal application state, or the HTML page, or using a custom API attack tool

H1-2006 CTF Writeup F859938 Summary: Access control enforces policy such that users cannot act outside of their intended permissions. Failures typically lead to unauthorized information disclosure, modification or destruction of all data, or performing a business function outside of the limits of...

h1-ctf: [H1-2006 2020] Exploiting multiple vulnerabilities to get hacker's payment ensured

Last week, Hackerone’s CEO Marten lost his credentials for BountyPay. A tweet from hackerone’s official twitter account asked for help from ethical hackers and bounty hunters to help the CEO recover his credentials and insure May’s payments. As an active bug hunter on Hackerone, I decided to take...

h1-ctf: [H1-2006 2020] In-depth resolution of the h1-2006 CTF

H1-2006 Write-up bountypay.h1ctf.com First of all, huge thanks to the creators for this CTF, it was really fun and got me to improve a lot ! It was my first h1 ctf, and it for sure won't be my last ! For this report, I'll try to define for each step : an abstract of what was the bug the real life...

h1-ctf: h1-ctf writeup , finally paid the payments by chaining multiple bugs

Summary: Ultimate aim is to pay the payments of hackerone using bounty pay with no use privileges at starting. Given scope is : .bountypay.h1ctf.com Enumerated subdomains are : 1. www.bountypay.h1ctf.com 2. app.bountypay.h1ctf.com 3. staff.bountypay.h1ctf.com 4. api.bountypay.h1ctf.com 5...

h1-ctf: [H1-2006 2020] CTF Writeup

Summary: The CTF's objective could be found in the following Twitter post: F858468 As outlined on https://hackerone.com/h1-ctf, all subdomains of bountypay.h1ctf.com are in scope. Doing subdomain enumeration revealed the following subdomains: api.bountypay.h1ctf.com app.bountypay.h1ctf.com...

h1-ctf: [H1-2006 2020] CTF Writeup

Summary: Multiple Vulnerabilities leading to full account takeover and access to restricted functions 1. Information Disclosure 2. Login 2FA Bypass 3. SSRF 4. Hardcoded validation 5. Sensitive information disclosure 6. Privilege Escalation 7. Payments 2FA Bypass through SSRF Steps To Reproduce: 0...

8x8: 2FA Disable With Wrong Password - Response Tampering.

The application contained a business logic flaw that resulted in missing validation when removing 2FA on the authenticated account...

h1-ctf: [H1-2006 2020] CTF writeup

Context Well, against all expectations you finally get it, you got the flag! Let's go back in time to remember how. --- Twitter Once upon a time As always the CTF starts with a tweet: F855948 --- Subdomains According to the policy page, .bountypay.h1ctf.com is in scope. You decide to scan...

h1-ctf: [H1-2006 2020] "Swiss Cheese" design style leads to helping Mårten Mickos pay poor hackers

Summary: Several vulnerabilities in the bountypay application leads to unauthorised access, information disclosure, SSRF and other fun stuff. Steps To Reproduce: This is how I helped Mårten Mickos pay the poor hackers who had been waiting so long for their bounties. First part: Web I started by...