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CVE-2021-39181— Unsafe Deserialization of User Data Using XStream

Quick assessment

Affected
OpenOLAT OpenOLAT
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.

OpenOLAT是一个基于网络的电子学习平台，用于教学、学习、评估和交流，一个 LMS，一个学习管理系统。 OpenOlat 15.3.18、15.5.3 和 16.0.0 版本之前存在安全漏洞，该漏洞允许攻击者执行任意代码。

CVSS 8.8 · High EPSS 1.91% · P79

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2021-39181

Vulnerability Information
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Vulnerability Title
Unsafe Deserialization of User Data Using XStream
Source: CVE Program / CVE List V5
Vulnerability Description
OpenOlat is a web-based learning management system (LMS). Prior to version 15.3.18, 15.5.3, and 16.0.0, using a prepared import XML file (e.g. a course) any class on the Java classpath can be instantiated, including spring AOP bean factories. This can be used to execute code arbitrary code by the attacker. The attack requires an OpenOlat user account with the authoring role. It can not be exploited by unregistered users. The problem is fixed in versions 15.3.18, 15.5.3, and 16.0.0. There are no known workarounds aside from upgrading.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
XML注入(XPath盲注)
Source: CVE Program / CVE List V5
Vulnerability Title
OpenOLAT安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
OpenOLAT是一个基于网络的电子学习平台，用于教学、学习、评估和交流，一个 LMS，一个学习管理系统。 OpenOlat 15.3.18、15.5.3 和 16.0.0 版本之前存在安全漏洞，该漏洞允许攻击者执行任意代码。
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
OpenOLAT OpenOLAT < 15.3.18 -

II. Public POCs for CVE-2021-39181

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III. Intelligence Information for CVE-2021-39181

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Patches & Fixes for CVE-2021-39181 (1)

Vendor Advisories for CVE-2021-39181 (1)

Other References for CVE-2021-39181 (1)

IV. Related Vulnerabilities

Same product: OpenOLAT
Same vendor: OpenOLAT
Same weakness: CWE-91

V. Comments for CVE-2021-39181

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