Heap overflow in simplestring_addn() in PHP and macOS - CVE-2016-6296

Vulnerability identifier: #VU221

CSH Severity: High

CVSS v4: 9.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2016-6296

CWE-ID: CWE-119

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to heap-based buffer overflow in simplestring_addn() function ('simplestring.c') within the XMLRPC component. A remote unauthenticated attacker can cause a heap-based buffer overflow and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

PHP
macOS
Ubuntu
libxmlrpc-epi0 (Ubuntu package)

Install the latest versions: (5.5.38, 5.6.24, 7.0.9).

libxmlrpc-epi0 (Ubuntu package) - update to 0.54.2-1.1ubuntu0.1

• https://bugs.php.net/bug.php?id=72606
• http://php.net/ChangeLog-5.php#5.5.38
• http://php.net/ChangeLog-5.php#5.6.24
• http://php.net/ChangeLog-7.php#7.0.9
• https://support.apple.com/en-us/HT207170

• Multiple vulnerabilities in PHP
• Ubuntu update for xmlrpc-epi