CVE-2015-9253
MEDIUM severity · CVSS 6.5 · Uncontrolled resource consumption
6.5CVSS MEDIUM
Summary
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.
Impact & exploitability
Attack vectorNetwork
Attack complexityLow
Privileges requiredLow
User interactionNone
Confidentiality impactNone
Integrity impactNone
Availability impactHigh
Exploit probability (EPSS)3%
CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Affected products we track (1)
Recommendation
Apply the vendor fix in your normal patch cycle. Open any affected product above for its exact safe version.
Official patch: https://github.com/php/php-src/commit/69dee5c732fe982c82edb17d0dbc3e79a47748d8 ↗
Additional information
- NVD record
- https://github.com/php/php-src/commit/69dee5c732fe982c82edb17d0dbc3e79a47748d8Patch
- https://bugs.php.net/bug.php?id=70185Advisory
- https://bugs.php.net/bug.php?id=73342https://github.com/php/php-src/pull/3287Advisory
- https://bugs.php.net/bug.php?id=75968Advisory
- https://github.com/php/php-src/blob/PHP-7.1.20/NEWS#L20-L22Advisory
- https://usn.ubuntu.com/3766-1/Advisory
- https://usn.ubuntu.com/4279-1/
- https://www.futureweb.at/security/CVE-2015-9253/Advisory