Command Injection in vBulletin

1) Command Injection

EUVDB-ID: #VU49028

Risk: High

CVSSv3.1: 8.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-7373

CWE-ID: CWE-77 - Command injection

Exploit availability: No

Description

The vulnerability allows a remote attacker to execute arbitrary commands on the target system.

The vulnerability exists due to improper input validation in subWidgets data in an "ajax/render/widget_tabbedcontainer_tab_panel" request. A remote attacker can pass specially crafted data to the application and execute arbitrary commands on the target system.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

vBulletin: 5.5.4 - 5.6.2

External links

http://blog.exploitee.rs/2020/exploiting-vbulletin-a-tale-of-patch-fail/
http://forum.vbulletin.com/forum/vbulletin-announcements/vbulletin-announcements_aa/4445227-vbulletin-5-6-0-5-6-1-5-6-2-security-patch
http://github.com/rapid7/metasploit-framework/pull/13970
http://seclists.org/fulldisclosure/2020/Aug/5

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.