#VU16317 Heap-based buffer overflow in PHP - CVE-2018-20783
Published: December 7, 2018 / Updated: December 7, 2018
Vulnerability identifier: #VU16317
Vulnerability risk: Low
CVSSv4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:P/U:Clear
CVE-ID: CVE-2018-20783
CWE-ID: CWE-122
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerable software:
PHP
PHP
Software vendor:
PHP Group
PHP Group
Description
The vulnerability allows a remote attacker to cause DoS condition on the target system.
The weakness exists due to heap-based buffer overflow while fuzzing with AFL using an ASAN instrumented PHP. A remote attacker can disable the ZEND allocator, use ASAN (or valgrind/etc?) with a crafted phar as input, trigger memory corruption and cause the service to crash.
The weakness exists due to heap-based buffer overflow while fuzzing with AFL using an ASAN instrumented PHP. A remote attacker can disable the ZEND allocator, use ASAN (or valgrind/etc?) with a crafted phar as input, trigger memory corruption and cause the service to crash.
Remediation
The vulnerability has been addressed in the versions 5.6.39, 7.0.33, 7.1.25, 7.2.13, 7.3.0.