Null pointer dereference in PHP - CVE-2018-19396
Published: November 22, 2018
Vulnerability identifier: #VU16019
CSH Severity: Low
CVSS v4: 8.7 [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]
CVE-ID: CVE-2018-19396
CWE-ID: CWE-476
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause DoS condition on the target system.
The vulnerability exists due to NULL pointer dereference condition that exists in the ext/standard/var_unserializer.c file when an unserialize call is made for the com, dotnet, or variant class. A remote attacker can send a specially crafted request that submits malicious input, trigger a NULL pointer dereference condition and cause the software to crash.
Affected software
PHP
php7 (Alpine package)
php7 (Alpine package)
How to mitigate CVE-2018-19396
Install update from vendor's website.
php7 (Alpine package) - update to 7.1.30-r0