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CVE-2023-33176— BigBlueButton 代码问题漏洞

一分钟漏洞结论

影响对象
bigbluebutton bigbluebutton
利用判断
尚无明确在野利用证据，仍需结合暴露面评估
建议动作
优先检查厂商安全公告和参考链接中的修复版本；无法立即升级时，限制受影响服务暴露并加强监测。

BigBlueButton是BigBlueButton社区的一套开源的Web会议系统。 BigBlueButton存在代码问题漏洞，该漏洞源于存在服务器端请求伪造 (SSRF) 漏洞。

CVSS 4.8 · Medium EPSS 0.47% · P38
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一、 漏洞 CVE-2023-33176 基础信息

漏洞信息
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Vulnerability Title
Blind SSRF When Uploading Presentation in BigBlueButton
来源: CVE Program / CVE List V5
Vulnerability Description
BigBlueButton is an open source virtual classroom designed to help teachers teach and learners learn. In affected versions are affected by a Server-Side Request Forgery (SSRF) vulnerability. In an `insertDocument` API request the user is able to supply a URL from which the presentation should be downloaded. This URL was being used without having been successfully validated first. An update to the `followRedirect` method in the `PresentationUrlDownloadService` has been made to validate all URLs to be used for presentation download. Two new properties `presentationDownloadSupportedProtocols` and `presentationDownloadBlockedHosts` have also been added to `bigbluebutton.properties` to allow administrators to define what protocols a URL must use and to explicitly define hosts that a presentation cannot be downloaded from. All URLs passed to `insertDocument` must conform to the requirements of the two previously mentioned properties. Additionally, these URLs must resolve to valid addresses, and these addresses must not be local or loopback addresses. There are no workarounds. Users are advised to upgrade to a patched version of BigBlueButton.
来源: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:L
来源: CVE Program / CVE List V5
Vulnerability Type
服务端请求伪造(SSRF)
来源: CVE Program / CVE List V5
Vulnerability Title
BigBlueButton 代码问题漏洞
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Description
BigBlueButton是BigBlueButton社区的一套开源的Web会议系统。 BigBlueButton存在代码问题漏洞，该漏洞源于存在服务器端请求伪造 (SSRF) 漏洞。
来源: 中国国家信息安全漏洞库 CNNVD
CVSS Information
N/A
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Type
N/A
来源: 中国国家信息安全漏洞库 CNNVD

受影响产品

厂商 产品 影响版本 CPE 订阅
bigbluebutton bigbluebutton >= 2.6.0, < 2.6.9 -

二、漏洞 CVE-2023-33176 的公开POC

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三、漏洞 CVE-2023-33176 的情报信息

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CVE-2023-33176 补丁与修复 (4)

CVE-2023-33176 厂商安全公告 (1)

IV. Related Vulnerabilities

Same product: bigbluebutton
Same vendor: bigbluebutton
Same weakness: CWE-918

V. Comments for CVE-2023-33176

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