When I introduce myself to others in the IT Security industry as a full-time Bug Hunter getting paid through Bug Bounties, they often have many questions (when I do this to people outside the industry they look at me funny and fake reasons to excuse themselves). In this post I reflect on my experiences after 12 months bug hunting for my primary source of income, and try to answer some of the more common questions I receive.
HackerOne bug report to WordPress: The Wordpress unzip_file function (https://codex.wordpress.org/Function_Reference/unzip_file) is vulnerable to path traversal when extracting zip files. Extracting untrusted zip files using this function this could lead to code execution through placing arbitrary PHP files in the DocumentRoot of the webserver.
As I come to the end of my first year of full-time Bug Bounty Hunting in this post I share some statistics of the bug reports I’ve submitted during 2019.
HackerOne bug report to GitLab: The GitLab::UrlBlocker IP address validation methods suffer from a Time of Check to Time of Use (ToCToU) vulnerability. The vulnerability occurs due to multiple DNS resolution requests performed before and after the checks. This issue allows a malicious authenticated user to send GET and POST HTTP requests to arbitrary hosts, including the localhost, cloud metadata services and the local network, and read the HTTP response.
HackerOne bug report to GitLab: Importing a modified exported GitLab project archive can overwrite uploads for other users. If the secret and file name of an upload are known (these can be easily identified for any uploads to public repositories), any user can import a new project which overwrites the served content of the upload with arbitrary content.
CI/CD pipelines are the perfect, bug-rich target for new and experienced bug hunters. As complex, user-controlled automated processes with access to authentication secrets, source code, and application servers in multi-system, multi-user environments, they combine all the things that make bugs likely. In the presentation, I will outline a methodology for hunting for bugs in CI/CD pipelines and walk through actual bugs which have resulted in tens of thousands of dollars in bounty payments.
An IDOR vulnerability exists in GitLab <v12.1.2, <v12.0.4, and <v11.11.6 that allowed uploading files from project archive to replace other users files potentially allowing an attacker to replace project binaries or other uploaded assets.
HackerOne bug report to New Relic: The Ticketing Integrations Jira webhooks for Jira 5/6 and Jira 4 are vulnerable to Blind SSRF issues. These endpoints can be abused to map internal NewRelic network services and send blind HTTP GET and POST requests to identified services.
The p4 Helix Command-Line Client uses the optional P4CLIENTPATH environment variable to restrict directories to which the application permitted to read or write files. This configuration can be trivially bypassed allowing a malicious Perforce server to read or write arbitrary files on the client system.