It then hashes the combination and it sends that hash along with the JSON data to. The way this works is that, as GitHub is about to send JSON data, it combines the data it’s about to send with a secret value that has been pre-shared with. When a request arrives at, presumably from GitHub, the webhook verifies that it is in fact GitHub making the request by using a shared secret and hashing algorithm.
This is called a remote code execution vulnerability or RCE. We analyzed this code and found a vulnerability that could allow an attacker to execute their own code on and gain access to. The PHP for this webhook is open source and can be found in this repository. The URL that GitHub contacts on is called a ‘webhook’ and is written in PHP. Then, when they commit a change to GitHub it will reach out and hit a URL on which then triggers a process on that brings down the latest code that was just added to GitHub. This allows them to use GitHub as their source code repository. Technical Details of the vulnerabilityĪpi. has a GitHub webhook that allows WordPress core developers to sync their code to the SVN repository. They have also awarded Wordfence lead developer Matt Barry a bounty for discovering and reporting it. They fixed the vulnerability within a few hours of acknowledging the report. We reported this vulnerability to the WordPress team via HackerOne. By compromising, an attacker could conceivably compromise more than a quarter of the websites worldwide in one stroke.īelow we describe the technical details of a serious security vulnerability that we uncovered earlier this year that could compromise. According to the WordPress documentation: “By default, every site has automatic updates enabled for minor core releases and translation files.”. WordPress powers approximately 27% of all websites on the Internet. It will trust any URL and any package that is supplied by.
This is all possible because WordPress itself provides no signature verification of the software being installed. This provides a way for an attacker to mass-compromise WordPress websites through the auto-update mechanism supplied by.
It also includes a URL to download and install the updated software.Ĭompromising this server could allow an attacker to supply their own URL to download and install software to WordPress websites, automatically. The response from this server contains information about any newer versions that may be available, including if the plugin, theme or core needs to be updated automatically. Every WordPress installation makes a request to this server about once an hour to check for plugin, theme, or WordPress core updates. The server (or servers) has an important role in the WordPress ecosystem: it releases automatic updates for WordPress websites. Choosing the most damaging target to attack The vulnerability we describe below may have allowed an attacker to use the WordPress auto-update function, which is turned on by default, to deploy malware to up to 27% of the Web at once. Recently we discovered a major vulnerability that could have caused a mass compromise of the majority of WordPress sites. In addition to this research, we regularly examine WordPress core and the related systems.
However, in order to get the most out of the game, you'll need more spades and free coins, which is probably why you've come here.Hacking 27% of the Web via WordPress Auto-UpdateĪt Wordfence, we continually look for security vulnerabilities in the third party plugins and themes that are widely used by the WordPress community. This allows you to interact with folks from all around the world and put your talents to the test.
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