CVE-2015-9253 Denial of service in n/a
Attackers can cause 100% CPU usage and disk exhaustion in PHP-FPM by triggering an endless restart loop via non-blocking STDIN streams.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2015-9253?
CVE-2015-9253 is a medium-severity denial of service vulnerability in Php Php, published on 19 Feb 2018. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
An issue was discovered in PHP 7.3.x before 7.3.0alpha3, 7.2.x before 7.2.8, and before 7.1.20. The php-fpm master process restarts a child process in an endless loop when using program execution functions (e.g., passthru, exec, shell_exec, or system) with a non-blocking STDIN stream, causing this master process to consume 100% of the CPU, and consume disk space with a large volume of error logs, as demonstrated by an attack by a customer of a shared-hosting facility.
Weakness: CWE-400
Which versions are affected by CVE-2015-9253?
It affects 1 product.
Products include Php Php.
How do I fix CVE-2015-9253?
Upgrade to a fixed version.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2015-9253 being exploited?
There is no known exploitation of CVE-2015-9253 in the wild and no public exploit code.
Other vulnerabilities in Php Php
Sources
Also known as GHSA-p68x-q9g7-4cgg, UBUNTU-CVE-2015-9253.