Security restrictions bypass in PHP - CVE-2015-4026
Published: November 27, 2018
Vulnerability identifier: #VU16117
CSH Severity: Low
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2015-4026
CWE-ID: CWE-264
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to bypass security restrictions on the target system.
The weakness exists due to the pcntl_exec implementation in PHP before 5.4.41, 5.5.x before 5.5.25, and 5.6.x before 5.6.9 truncates a pathname upon encountering a x00 character. A remote attacker can bypass intended extension restrictions and execute files with unexpected names via a crafted first argument.
The weakness exists due to the pcntl_exec implementation in PHP before 5.4.41, 5.5.x before 5.5.25, and 5.6.x before 5.6.9 truncates a pathname upon encountering a x00 character. A remote attacker can bypass intended extension restrictions and execute files with unexpected names via a crafted first argument.
Affected software
PHP
Amazon Linux AMI
Slackware Linux
Fedora
php5 (Ubuntu package)
php
Amazon Linux AMI
Slackware Linux
Fedora
php5 (Ubuntu package)
php
How to mitigate CVE-2015-4026
Install update from vendor's website.
PHP - addressed in versions 5.4.41, 5.5.25, 5.6.9
php5 (Ubuntu package) - addressed in versions 5.3.10-1ubuntu3.19, 5.5.9+dfsg-1ubuntu4.11, 5.5.12+dfsg-2ubuntu4.6, 5.6.4+dfsg-4ubuntu6.2
php - addressed in versions 5.6.9-1.fc21, 5.6.9-1.fc22
php5 (Ubuntu package) - addressed in versions 5.3.10-1ubuntu3.19, 5.5.9+dfsg-1ubuntu4.11, 5.5.12+dfsg-2ubuntu4.6, 5.6.4+dfsg-4ubuntu6.2
php - addressed in versions 5.6.9-1.fc21, 5.6.9-1.fc22