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CVE-2023-42804— BigBlueButton Path Traversal – Reading Certain File Extensions

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之前版本存在路径遍历漏洞，该漏洞源于存在路径遍历漏洞。未经身份验证的攻击者可利用该漏洞遍历和读取文件。

CVSS 3.1 · Low EPSS 0.46% · P37
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I. Basic Information for CVE-2023-42804

Vulnerability Information
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Vulnerability Title
BigBlueButton Path Traversal – Reading Certain File Extensions
Source: CVE Program / CVE List V5
Vulnerability Description
BigBlueButton is an open-source virtual classroom. BigBlueButton prior to version 2.6.0-beta.1 has a path traversal vulnerability that allows an attacker with a valid starting folder path, to traverse and read other files without authentication, assuming the files have certain extensions (txt, swf, svg, png). In version 2.6.0-beta.1, input validation was added on the parameters being passed and dangerous characters are stripped. 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:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
对路径名的限制不恰当(路径遍历)
Source: CVE Program / CVE List V5
Vulnerability Title
BigBlueButton 路径遍历漏洞
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之前版本存在路径遍历漏洞，该漏洞源于存在路径遍历漏洞。未经身份验证的攻击者可利用该漏洞遍历和读取文件。
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.1 -

II. Public POCs for CVE-2023-42804

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III. Intelligence Information for CVE-2023-42804

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Patches & Fixes for CVE-2023-42804 (1)

Vendor Advisories for CVE-2023-42804 (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-2023-42803 5.3 MEDIUM BigBlueButton Unrestricted File Upload vulnerability

IV. Related Vulnerabilities

Same product: bigbluebutton
Same vendor: bigbluebutton
Same weakness: CWE-22

V. Comments for CVE-2023-42804

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