#VU49028 Command Injection in vBulletin - CVE-2020-7373

Vulnerability identifier: #VU49028

Vulnerability risk: High

CVSSv4.0: 8.1 [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/E:U/U:Amber]

CVE-ID: CVE-2020-7373

CWE-ID: CWE-77

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
vBulletin
Web applications / Forum & blogging software

Vendor: vBulletin

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

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

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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.