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CVE-2023-42803— BigBlueButton Unrestricted File Upload vulnerability

Quick assessment

Affected
bigbluebutton bigbluebutton
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

BigBlueButton是BigBlueButton社区的一套开源的Web会议系统。 BigBlueButton 2.6.0之前版本存在代码问题漏洞，该漏洞源于insertDocument API存在文件上传漏洞。

CVSS 5.3 · Medium EPSS 0.54% · P43

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2023-42803

Vulnerability Information
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Vulnerability Title
BigBlueButton Unrestricted File Upload vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
BigBlueButton is an open-source virtual classroom. BigBlueButton prior to version 2.6.0-beta.2 is vulnerable to unrestricted file upload, where the insertDocument API call does not validate the given file extension before saving the file, and does not remove it in case of validation failures. BigBlueButton 2.6.0-beta.2 contains a patch. There are no known workarounds.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
危险类型文件的不加限制上传
Source: CVE Program / CVE List V5
Vulnerability Title
BigBlueButton 代码问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
BigBlueButton是BigBlueButton社区的一套开源的Web会议系统。 BigBlueButton 2.6.0之前版本存在代码问题漏洞，该漏洞源于insertDocument API存在文件上传漏洞。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
bigbluebutton bigbluebutton < 2.6.0-beta.2 -

II. Public POCs for CVE-2023-42803

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III. Intelligence Information for CVE-2023-42803

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Patches & Fixes for CVE-2023-42803 (1)

Vendor Advisories for CVE-2023-42803 (1)

Same Patch Batch · bigbluebutton · 2023-10-30 · 4 CVEs total

CVE-2023-43797 6.3 MEDIUM BigBlueButton Stored Cross-site Scripting vulnerability at Guest Lobby
CVE-2023-43798 5.6 MEDIUM BigBlueButton Blind SSRF When Uploading Presentation (mitigation bypass)
CVE-2023-42804 3.1 LOW BigBlueButton Path Traversal – Reading Certain File Extensions

IV. Related Vulnerabilities

Same product: bigbluebutton
Same vendor: bigbluebutton
Same weakness: CWE-434

V. Comments for CVE-2023-42803

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