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CVE-2021-21249— Post-Auth Unsafe Yaml deserialization

Quick assessment

Affected
theonedev onedev
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.

Theonedev Onedev是Theonedev团队的一个基于JAVA的多合一DevOps平台。该平台支持容器构建、编排、CI、Git管理、团队协作等功能，帮助开发者构建一个简单、功能强大的开发平台。 OneDev before version 4.0.3 存在代码问题漏洞，攻击者可利用该漏洞运行任意代码。

CVSS 9.6 · Critical EPSS 2.93% · P87

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter
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I. Basic Information for CVE-2021-21249

Vulnerability Information
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Vulnerability Title
Post-Auth Unsafe Yaml deserialization
Source: CVE Program / CVE List V5
Vulnerability Description
OneDev is an all-in-one devops platform. In OneDev before version 4.0.3, there is an issue involving YAML parsing which can lead to post-auth remote code execution. In order to parse and process YAML files, OneDev uses SnakeYaml which by default (when not using `SafeConstructor`) allows the instantiation of arbitrary classes. We can leverage that to run arbitrary code by instantiating classes such as `javax.script.ScriptEngineManager` and using `URLClassLoader` to load the script engine provider, resulting in the instantiation of a user controlled class. For a full example refer to the referenced GHSA. This issue was addressed in 4.0.3 by only allowing certain known classes to be deserialized
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:N
Source: CVE Program / CVE List V5
Vulnerability Type
输出中的特殊元素转义处理不恰当(注入)
Source: CVE Program / CVE List V5
Vulnerability Title
Theonedev Onedev 代码问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Theonedev Onedev是Theonedev团队的一个基于JAVA的多合一DevOps平台。该平台支持容器构建、编排、CI、Git管理、团队协作等功能，帮助开发者构建一个简单、功能强大的开发平台。 OneDev before version 4.0.3 存在代码问题漏洞，攻击者可利用该漏洞运行任意代码。
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
theonedev onedev < 4.0.3 -

II. Public POCs for CVE-2021-21249

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III. Intelligence Information for CVE-2021-21249

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Patches & Fixes for CVE-2021-21249 (1)

Vendor Advisories for CVE-2021-21249 (1)

Same Patch Batch · theonedev · 2021-01-15 · 10 CVEs total

CVE-2021-21242 10.0 CRITICAL Pre-Auth Unsafe Deserialization on AttachmentUploadServet
CVE-2021-21243 10.0 CRITICAL Pre-Auth Unsafe Deserialization on KubernetesResource
CVE-2021-21244 10.0 CRITICAL Pre-Auth SSTI via Bean validation message tampering
CVE-2021-21245 10.0 CRITICAL Pre-Auth Arbitrary File Upload
CVE-2021-21247 9.6 CRITICAL Post-Auth Unsafe Deserialization on BasePage (AJAX)
CVE-2021-21248 9.6 CRITICAL Post-Auth Arbitrary Code execution via Groovy script injection
CVE-2021-21246 8.6 HIGH Pre-Auth Access token leak
CVE-2021-21250 7.7 HIGH Post-Auth External Entity Expansion (XXE)
CVE-2021-21251 7.7 HIGH ZipSlip Arbitrary File Upload

IV. Related Vulnerabilities

Same product: onedev
Same vendor: theonedev
Same weakness: CWE-74

V. Comments for CVE-2021-21249

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