PHP CVE-2019-11042 Heap Buffer Overflow Vulnerability

Description

PHP is prone to a heap-based buffer-overflow vulnerability. Successfully exploiting this issue allow attackers to execute arbitrary code in the context of the affected application. Failed exploits will result in denial-of-service conditions. PHP versions prior to 7.3.8 are vulnerable.

Technologies Affected

• Apple IMac
• Apple Mac Pro
• Apple MacBook
• Apple MacMini
• Apple Macbook Air
• Apple Macbook Pro
• Apple iMac Pro
• Apple macOS 10.12
• Apple macOS 10.12.1
• Apple macOS 10.12.2
• Apple macOS 10.12.3
• Apple macOS 10.12.4
• Apple macOS 10.12.5
• Apple macOS 10.12.6
• Apple macOS 10.13
• Apple macOS 10.13.1
• Apple macOS 10.13.2
• Apple macOS 10.13.3
• Apple macOS 10.13.4
• Apple macOS 10.13.5
• Apple macOS 10.13.6
• Apple macOS 10.14
• Apple macOS 10.14.1
• Apple macOS 10.14.2
• Apple macOS 10.14.3
• Apple macOS 10.14.4
• Apple macOS 10.14.5
• Apple macOS 10.14.6
• PHP PHP 7.1.30
• PHP PHP 7.3.0
• PHP PHP 7.3.1
• PHP PHP 7.3.2
• PHP PHP 7.3.3
• PHP PHP 7.3.4
• PHP PHP 7.3.5
• PHP PHP 7.3.6
• PHP PHP 7.3.7

Recommendations

Run all software as a nonprivileged user with minimal access rights.
Ensure that all nonadministrative tasks, such as browsing the web and reading email, are performed as an unprivileged user with minimal access rights.

Deploy network intrusion detection systems to monitor network traffic for malicious activity.
Deploy NIDS to monitor network traffic for signs of anomalous or suspicious activity. This may indicate exploit attempts or activity that results from a successful exploit.

Do not follow links provided by unknown or untrusted sources.
To reduce the likelihood of successful exploits, never visit sites of questionable integrity or follow links provided by unfamiliar or untrusted sources.

Set web browser security to disable the execution of script code or active content.
To prevent a successful exploit of script-execution vulnerabilities, disable support for script code and active content within the client browser. Note that this tactic might adversely affect websites that rely on HTML or script code.

Implement multiple redundant layers of security.
Various memory-protection schemes (such as nonexecutable and randomly mapped memory segments) may hinder an attacker’s ability to exploit memory corruption vulnerabilities.

Updates are available. Please see the references or vendor advisory for more information.