php php CVE-2019-11043 vulnerability in PHP and Other Products
Published on October 28, 2019

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In PHP versions 7.1.x below 7.1.33, 7.2.x below 7.2.24 and 7.3.x below 7.3.11 in certain configurations of FPM setup it is possible to cause FPM module to write past allocated buffers into the space reserved for FCGI protocol data, thus opening the possibility of remote code execution.

Vendor Advisory NVD

Known Exploited Vulnerability

This PHP FastCGI Process Manager (FPM) Buffer Overflow Vulnerability is part of CISA's list of Known Exploited Vulnerabilities. In some versions of PHP in certain configurations of FPM setup, it is possible to cause FPM module to write past allocated buffers allowing the possibility of remote code execution.

The following remediation steps are recommended / required by April 15, 2022: Apply updates per vendor instructions.

Vulnerability Analysis

CVE-2019-11043 can be exploited with network access, and does not require authorization privileges or user interaction. This vulnerability is considered to have a low attack complexity. It has the highest possible exploitability rating (3.9). The potential impact of an exploit of this vulnerability is considered to be critical as this vulnerability has a high impact to the confidentiality, integrity and availability of this component.

What is a Memory Corruption Vulnerability?

The software writes data past the end, or before the beginning, of the intended buffer. Typically, this can result in corruption of data, a crash, or code execution. The software may modify an index or perform pointer arithmetic that references a memory location that is outside of the boundaries of the buffer. A subsequent write operation then produces undefined or unexpected results.

CVE-2019-11043 has been classified to as a Memory Corruption vulnerability or weakness.


Products Associated with CVE-2019-11043

You can be notified by stack.watch whenever vulnerabilities like CVE-2019-11043 are published in these products:

PHP
 
Canonical Ubuntu Linux
 
Debian Linux
 

What versions are vulnerable to CVE-2019-11043?