#VU27705 Improper access control in vBulletin - CVE-2020-12720

Vulnerability identifier: #VU27705

Vulnerability risk: Medium

CVSSv4.0: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:A/U:Green]

CVE-ID: CVE-2020-12720

CWE-ID: CWE-284

Exploitation vector: Network

Exploit availability: Yes

Vulnerable software:
vBulletin
Web applications / Forum & blogging software

Vendor: vBulletin

Description

The vulnerability allows a remote attacker to gain unauthorized access to sensitive information.

The vulnerability exists due to improper access restrictions. A remote attacker can send a specially crafted request and gain unauthorized access to the affected application.

Mitigation
Install update from vendor's website.

Vulnerable software versions

vBulletin: 5.5.0 - 5.6.1

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External links
https://forum.vbulletin.com/forum/vbulletin-announcements/vbulletin-announcements_aa/4440032-vbulletin-5-6-1-security-patch-level-1

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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. However, a fully functional exploit for this vulnerability is available.