Description

GULP is a leading personnel service provider in the areas of IT, engineering and finance.

Bounties

Responsible disclosure

Domains

*.gulp.ch

No Bounty
URL

*.gulp.de

No Bounty
URL

demo.tendertracker.de

No Bounty
URL

www.gulp-shop.de

No Bounty
URL
In scope

We are happy to announce our responisble disclosure. We've done our best to clean most of our known issues and now would like to request your help to spot the once we missed! We are specifically looking for

  • leaking of personal data
  • horizontal / vertical privilege escalation
  • SQLi
  • ...

The use of an intigriti.me address is mandatory when testing.

The websites www.gulp.de and www.gulp.ch share the same codebase. They can contain common issues. If a specific issue has already been found in another one of these websites it will be treated as a duplicate for this one.

Out of scope

Spamming / scanning contact forms or forms that might initiate internal processes is strictly prohibited

Endpoints

Any endpoints which are not own by Randstad are out of scope, as for example :

Application

  • Self-XSS that cannot be used to exploit other users
  • Verbose messages/files/directory listings without disclosing any sensitive information
  • CORS misconfiguration on non sensitive endpoints
  • Missing cookie flags
  • Missing security headers
  • Cross-site Request Forgery with no or low impact
  • Presence of autocomplete attribute on web forms.
  • Reverse tabnabbing
  • Bypassing rate-limits or the non-existence of rate-limits.
  • Best practices violations (password complexity, expiration, re-use, etc.)
  • Clickjacking on pages without sensitive actions
  • CSV Injection
  • Host Header Injection
  • Sessions not being invalidated (logout, enabling 2FA, ..)
  • Hyperlink injection/takeovers
  • Mixed content type issues
  • Cross-domain referer leakage
  • Anything related to email spoofing, SPF, DMARC or DKIM
  • Content injection
  • Username / email enumeration
  • E-mail bombing
  • HTTP Request smuggling without any proven impact
  • Homograph attacks
  • XMLRPC enabled
  • Banner grabbing /Version disclosure
  • Open ports without an accompanying proof-of-concept demonstrating vulnerability
  • Weak SSL configurations and SSL/TLS scan reports
  • Not stripping metadata of images
  • public API keys without proven impact
  • Arbitrary file upload without proof of the existence of the uploaded file

General

  • In case that a reported vulnerability was already known to the company from their own tests, it will be flagged as a duplicate.
  • Theoretical security issues with no realistic exploit scenario(s) or attack surfaces, or issues that would require complex end user interactions to be exploited, may be excluded or be lowered in severity
  • Spam, social engineering and physical intrusion
  • DoS/DDoS attacks or brute force attacks.
  • Vulnerabilities that are limited to non-current browsers (older than 3 versions) will not be accepted
  • Attacks requiring the usage of shared computers, man in the middle or compromised user accounts
  • Recently disclosed zero-day vulnerabilities in commercial products where no patch or a recent patch (< 2 weeks) is available. We need time to patch our systems just like everyone else - please give us 2 weeks before reporting these types of issues.
  • Attacks requiring unrealistic user interaction
Rules of engagement

Our promise to you

  • We will respond to report in ultimately two weeks, probably faster!
  • We are happy to respond to any questions, please use the button in the right top corner for this.
  • We respect the safe harbour clause that you can find below

Your promise to us

  • Provide detailed but to-the point reproduction steps
  • Include a clear attack scenario. How will this affect us exactly?
  • Remember: quality over quantity!
  • Please do not discuss or post vulnerabilities without our consent (including PoC's on YouTube and Vimeo)
  • Please do not use automatic scanners -be creative and do it yourself! We cannot accept any submissions found by using automatic scanners. Scanners also won't improve your skills, and can cause a high server load (we'd like to put our time in thanking researchers rather than blocking their IP's 😉)

Safe harbour for researchers

Randstad considers ethical hacking activities conducted consistent with the Researcher Guidelines, the Program description and restrictions (the Terms) to constitute “authorized” conduct under criminal law. Randstad will not pursue civil action or initiate a complaint for accidental, good faith violations, nor will they file a complaint for circumventing technological measures used by us to protect the scope as part of your ethical hacking activities.

If legal action is initiated by a third party against you and you have complied with the Terms, Randstad will take steps to make it known that your actions were conducted in compliance and with our approval.

Severity assessment

Exceptional

  • RCE (Remote Code Execution)

Critical

  • Access to all customer personal data
  • SQL injection

High

  • Stored XSS without user interaction
  • Privilege escalation
  • Authentication bypass on critical infrastructure

Medium

  • XSS
  • CSRF with a significant impact

Low

  • XSS that requires lots of user interaction ( > 3 steps)
  • CSRF with a very limited impact
FAQ

Where can we get credentials for the app?

You can self-register on the application but please don’t forget to use your @intigriti.me address.

All aboard!
Please log in or sign up on the platform

For obvious reasons we can only allow submissions or applications for our program with a valid intigriti account.

It will only take 2 minutes to create a new one or even less to log in with an existing account, so don't hesitate and let's get started. We would be thrilled to have you as part of our community.

Program specifics
ID check required
Reputation points
Triage
Last 90 day response times
avg. days first response
0.90
avg. days to decide
2.11
avg. days to triage
0.92
Activity
9/29
Randstad
has suspended the program
9/21
Randstad
closed a submission
9/18
logo
bhupen
created a submission
9/11
Randstad
accepted a submission
9/9
logo
alph4byt3
created a submission
9/4
Randstad
closed a submission
9/3
logo
pheonix
created a submission
8/24
Randstad
closed a submission
8/23
logo
jomar
created a submission
8/17
Randstad
closed a submission