CVE-2021-21249— Post-Auth Unsafe Yaml deserialization
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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: NVD (National Vulnerability Database)
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: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
输出中的特殊元素转义处理不恰当(注入)
Source: NVD (National Vulnerability Database)
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
II. Public POCs for CVE-2021-21249
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- https://github.com/theonedev/onedev/security/advisories/GHSA-7xhq-m2q9-6hpmx_refsource_CONFIRM
- https://nvd.nist.gov/vuln/detail/CVE-2021-21249
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 vendor: theonedev
Same weakness: CWE-74
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V. Comments for CVE-2021-21249
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