OS Command Injection in vBulletin - CVE-2019-16759
Published: September 25, 2019 / Updated: June 17, 2021
Vulnerability identifier: #VU21323
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-2019-16759
CWE-ID: CWE-78
Exploitation vector: Remote access
Exploit availability:
The vulnerability is being exploited in the wild
Vulnerability details
The vulnerability allows a remote attacker to execute arbitrary shell commands on the target system.
The vulnerability exists due to improper input validation in "ajax/render/widget_php" when processing data passed via the "widgetConfig[code]" HTTP POST parameter. A remote unauthenticated attacker can send specially crafted HTTP POST request to the affected application and execute arbitrary OS commands on the target system.
Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.
Note: The vulnerability is being actively exploited in the wild.
Affected software
vBulletin
How to mitigate CVE-2019-16759
Install updates from vendor's website.
vBulletin - addressed in versions 5.5.2 Patch Level 1, 5.5.3 Patch Level 1, 5.5.4 Patch Level 1
Links to Public Exploits and PoC-codes
- Exploit #5683 - vBulletin 5.6.2 - 'widget_tabbedContainer_tab_panel' Remote Code Execution (June 17, 2021)
- Exploit #4595 - CVE-2019-16759 (Vbulletin RCE Exploits) (September 11, 2020)
- Exploit #4549 - CVE-2019-16759 (Vbulletin RCE Exploit) (September 1, 2020)
- Exploit #267 - CVE-2019-16759-Vbulletin-rce-exploit (Vbulletin rce exploit CVE-2019-16759) (March 18, 2020)
- Exploit #268 - vbull (Mass Exploit CVE-2019-16759) (March 18, 2020)
- Exploit #1439 - vBulletin 5.0 < 5.5.4 - Unauthenticated Remote Code Execution (March 18, 2020)
- Exploit #1440 - vBulletin 5.x - Remote Command Execution (Metasploit) (March 18, 2020)
- Exploit #1499 - vBulletin widgetConfig RCE (March 18, 2020)