Remote Code Execution Vulnerability in phpBB3 - CVE-2018-19274
Summary
UBUNTU-CVE-2018-19274: Passing an absolute path to a file_exists check in phpBB before 3.2.4 allows Remote Code Execution through Object Injection by employing Phar deserialization when an attacker has access to the Admin Control Panel with fo... Affects phpbb3 versions < 3.0.12-1ubuntu0.1~esm1. Fixed in 3.0.12-1ubuntu0.1~esm1. How to fix ↓
Check if this vulnerability affects your application
Upload a manifest or SBOM and we'll show whether you're affected, plus every other risky package in the same scan.
No signup required · Results in about 60 seconds
Habilume
Habit tracker with a companion that grows with you
Complete habits, earn Lume Points, and watch your Lume grow as you stay consistent.
Background
phpBB3 is a widely used open-source forum software that allows users to create and manage online discussion boards. It is known for its extensibility, user-friendly interface, and strong community support. However, versions prior to 3.2.4 are susceptible to a critical vulnerability that can lead to remote code execution, particularly when an attacker gains access to the Admin Control Panel with founder permissions.
Vulnerability Detail
The vulnerability arises from the improper handling of file paths in the file_exists check within phpBB3. By passing an absolute path, an attacker can exploit this flaw through Object Injection via Phar deserialization. This can lead to remote code execution, allowing the attacker to execute arbitrary code on the server, potentially compromising the entire forum and its data.
How To Fix
Minimum fixed version
3.0.12-1ubuntu0.1~esm1
This is the first release that contains the fix.
sudo apt-get install --only-upgrade phpbb3Tip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
As a temporary workaround, it is advisable to restrict access to the Admin Control Panel to trusted users only, and to monitor file paths used in the application to prevent unauthorized access. Additionally, disabling the use of Phar deserialization can mitigate the risk until a proper patch is applied.
Conclusion
CVE-2018-19274 represents a significant security risk for phpBB3 installations prior to version 3.2.4. It is crucial for users to update their software to the latest patched versions to protect against potential remote code execution attacks. Additionally, employing monitoring tools like Vulert can help maintain security by alerting users to vulnerabilities in real-time.
See every vulnerability recorded for phpbb3 →
FAQ
CVE-2018-19274 is a vulnerability in phpBB3 that allows remote code execution through improper handling of file paths.
If you are using a version of phpBB3 prior to 3.2.4, your installation may be vulnerable. You can check your version in the admin panel.
Exploitation of this vulnerability can lead to remote code execution, allowing attackers to take control of the server and access sensitive data.
Yes, tools like Vulert can monitor your application for open-source vulnerabilities in real-time using a manifest file.
The CVSS score for CVE-2018-19274 is 7.2, indicating a high severity level.
Related vulnerabilities
Recent vulnerabilities recorded for phpbb3.
Habilume
Habit tracker with a companion that grows with you
Complete habits, earn Lume Points, and watch your Lume grow as you stay consistent.
