apereo opencast 对外部实体的文件或目录可访问

CVE编号

CVE-2021-43821

利用情况

暂无

补丁情况

N/A

披露时间

2021-12-15

漏洞描述

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.

解决建议

建议您更新当前系统或软件至最新版，完成漏洞的修复。

参考链接
https://github.com/opencast/opencast/blob/69952463971cf578363e3b97d8edaf334ff...
https://github.com/opencast/opencast/commit/65c46b9d3e8f045c544881059923134571897764
https://github.com/opencast/opencast/security/advisories/GHSA-59g4-hpg3-3gcp
https://mvnrepository.com/artifact/org.opencastproject/opencast-ingest-service-impl

受影响软件情况

#	类型	厂商	产品	版本	影响面
1
	运行在以下环境
	应用	apereo	opencast	*		Up to (excluding) 10.6

CVSS3评分 9.9

• 攻击路径 网络
• 攻击复杂度 低
• 权限要求 低
• 影响范围 已更改
• 用户交互 无
• 可用性 高
• 保密性 高
• 完整性 高

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H CWE-ID 漏洞类型 CWE-552 对外部实体的文件或目录可访问