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CVE-2021-41110— CWL Viewer: deserialization of untrusted data can lead to complete takeover by an attacker

Quick assessment

Affected
common-workflow-language cwlviewer
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.

Cwlviewer是一个用于查看和共享通用工作流语言工作流的 Web 应用程序。 cwlviewer 存在代码问题漏洞，该漏洞源于SnakeYaml 构造函数允许解析任何数据。

CVSS 9.1 · Critical EPSS 2.81% · P86

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2021-41110

Vulnerability Information
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Vulnerability Title
CWL Viewer: deserialization of untrusted data can lead to complete takeover by an attacker
Source: CVE Program / CVE List V5
Vulnerability Description
cwlviewer is a web application to view and share Common Workflow Language workflows. Versions prior to 1.3.1 contain a Deserialization of Untrusted Data vulnerability. Commit number f6066f09edb70033a2ce80200e9fa9e70a5c29de (dated 2021-09-30) contains a patch. There are no available workarounds aside from installing the patch. The SnakeYaml constructor, by default, allows any data to be parsed. To fix the issue the object needs to be created with a `SafeConstructor` object, as seen in the patch.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
可信数据的反序列化
Source: CVE Program / CVE List V5
Vulnerability Title
Cwlviewer 代码问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Cwlviewer是一个用于查看和共享通用工作流语言工作流的 Web 应用程序。 cwlviewer 存在代码问题漏洞，该漏洞源于SnakeYaml 构造函数允许解析任何数据。
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
common-workflow-language cwlviewer < 1.3.1 -

II. Public POCs for CVE-2021-41110

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III. Intelligence Information for CVE-2021-41110

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Patches & Fixes for CVE-2021-41110 (1)

Vendor Advisories for CVE-2021-41110 (1)

Other References for CVE-2021-41110 (1)

IV. Related Vulnerabilities

Same weakness: CWE-502

V. Comments for CVE-2021-41110

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