PHP Code Injection in vBulletin - CVE-2019-17132
Published: October 8, 2019 / Updated: June 17, 2021
Vulnerability identifier: #VU21600
CSH Severity: High
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2019-17132
CWE-ID: CWE-94
Exploitation vector: Remote access
Exploit availability:
Public exploit is available
Vulnerability details
The vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to improper input validation in the " ajax/api/user/updateAvatar" endpoint when processing data passed via the "data[filedata" HTTP POST parameter. A remote authenticated attacker can send a specially crafted request to the Avatar update script and execute arbitrary PHP code on the target system.
Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.
Affected software
vBulletin
How to mitigate CVE-2019-17132
Install updates from vendor's website.
vBulletin - addressed in versions 5.5.2 Patch Level 2, 5.5.3 Patch Level 2, 5.5.4 Patch Level 2