Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1359 CNY

100%
Buy Us a Coffee

CVE-2021-43821— Files Accessible to External Parties in Opencast

Quick assessment

Affected
opencast opencast
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Opencast是Opencast组织的一款用于大规模自动视频捕获，管理和分发的直播视频支撑软件。 Opencast 存在安全漏洞，该漏洞源于Opencast会在摄取期间打开并包含本地文件。攻击者可以利用它来包含该进程有权读取的大多数本地文件，从主机中提取机密。

CVSS 9.9 · Critical EPSS 2.03% · P80

Possible ATT&CK Techniques 1 AI

T1005 · Data from Local System
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2021-43821

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
Files Accessible to External Parties in Opencast
Source: CVE Program / CVE List V5
Vulnerability Description
Opencast is an Open Source Lecture Capture & Video Management for Education. Opencast before version 9.10 or 10.6 allows references to local file URLs in ingested media packages, allowing attackers to include local files from Opencast's host machines and making them available via the web interface. Before Opencast 9.10 and 10.6, Opencast would open and include local files during ingests. Attackers could exploit this to include most local files the process has read access to, extracting secrets from the host machine. An attacker would need to have the privileges required to add new media to exploit this. But these are often widely given. The issue has been fixed in Opencast 10.6 and 11.0. You can mitigate this issue by narrowing down the read access Opencast has to files on the file system using UNIX permissions or mandatory access control systems like SELinux. This cannot prevent access to files Opencast needs to read though and we highly recommend updating.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
对外部实体的文件或目录可访问
Source: CVE Program / CVE List V5
Vulnerability Title
Opencast 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Opencast是Opencast组织的一款用于大规模自动视频捕获，管理和分发的直播视频支撑软件。 Opencast 存在安全漏洞，该漏洞源于Opencast会在摄取期间打开并包含本地文件。攻击者可以利用它来包含该进程有权读取的大多数本地文件，从主机中提取机密。
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
opencast opencast < 10.6 -

II. Public POCs for CVE-2021-43821

# POC Description Source Link Shenlong Link
1 opencast cve-2021-43821敏感信息泄露漏洞环境 https://github.com/Jackey0/opencast-CVE-2021-43821-env POC Details
AI-Generated POC Premium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2021-43821

请登录查看更多情报信息。

Patches & Fixes for CVE-2021-43821 (1)

Vendor Advisories for CVE-2021-43821 (1)

Other References for CVE-2021-43821 (2)

IV. Related Vulnerabilities

Same product: opencast
Same vendor: opencast
Same weakness: CWE-552

V. Comments for CVE-2021-43821

No comments yet

Leave a comment