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CVE-2021-31805— Forced OGNL evaluation, when evaluated on raw not validated user input in tag attributes, may lead to RCE.

Quick assessment

Affected
Apache Software Foundation Apache Struts
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Apache Struts 2是美国阿帕奇（Apache）基金会的一个用于开发Java EE网络应用程序的开放源代码网页应用程序架构。 Apache Struts 2.0.0版本至2.5.29版本存在安全漏洞，该漏洞源于对不受信任的用户输入在标签属性中使用强制 OGNL 评估。攻击者可利用该漏洞进行远程代码执行并导致安全性降低。

AI Predicted 9.8 Difficulty: Easy EPSS 85.43% · P100

Public Exploits 1

Nuclei · 1 CVE-2021-31805.yaml [template]

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2021-31805

Vulnerability Information
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Vulnerability Title
Forced OGNL evaluation, when evaluated on raw not validated user input in tag attributes, may lead to RCE.
Source: CVE Program / CVE List V5
Vulnerability Description
The fix issued for CVE-2020-17530 was incomplete. So from Apache Struts 2.0.0 to 2.5.29, still some of the tag’s attributes could perform a double evaluation if a developer applied forced OGNL evaluation by using the %{...} syntax. Using forced OGNL evaluation on untrusted user input can lead to a Remote Code Execution and security degradation.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
表达式语言语句中使用的特殊元素转义处理不恰当(表达式语言注入)
Source: CVE Program / CVE List V5
Vulnerability Title
Apache Struts 2 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Apache Struts 2是美国阿帕奇（Apache）基金会的一个用于开发Java EE网络应用程序的开放源代码网页应用程序架构。 Apache Struts 2.0.0版本至2.5.29版本存在安全漏洞，该漏洞源于对不受信任的用户输入在标签属性中使用强制 OGNL 评估。攻击者可利用该漏洞进行远程代码执行并导致安全性降低。
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)

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Affected Products

Vendor Product Affected Versions CPE Subscribe
Apache Software Foundation Apache Struts 2.0.0 to 2.5.29 -

II. Public POCs for CVE-2021-31805

# POC Description Source Link Shenlong Link
1 远程代码执行S2-062 CVE-2021-31805验证POC https://github.com/pyroxenites/s2-062 POC Details
2 S2-062 (CVE-2021-31805) / S2-061 / S2-059 RCE https://github.com/Wrin9/CVE-2021-31805 POC Details
3 Apache Struts2 S2-062远程代码执行漏洞(CVE-2021-31805) | 反弹Shell https://github.com/Axx8/Struts2_S2-062_CVE-2021-31805 POC Details
4 Apache Struts2 S2-062远程代码执行漏洞(CVE-2021-31805) 支持批量扫描漏洞及漏洞利用 https://github.com/jax7sec/S2-062 POC Details
5 PoC for CVE-2021-31805 (Apache Struts2) https://github.com/aeyesec/CVE-2021-31805 POC Details
6 Apache Struts2 S2-062(CVE-2021-31805)远程代码执行批量检测（无利用） https://github.com/fleabane1/CVE-2021-31805-POC POC Details
7 S2-061/S2-062 Struts2 远程命令执行漏洞 POC&EXP https://github.com/z92g/CVE-2021-31805 POC Details
8 Vulnerable environment of CVE-2021-31805 (S2-062) for testing https://github.com/nth347/CVE-2021-31805 POC Details
9 Apache Struts2 S2-062 is vulnerable to remote code execution. The fix issued for CVE-2020-17530 (S2-061) was incomplete, meaning some of the tag's attributes could still perform a double evaluation if a developer applied forced OGNL evaluation by using the %{...} syntax. https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2021/CVE-2021-31805.yaml POC Details
10 None https://github.com/Threekiii/Awesome-POC/blob/master/%E4%B8%AD%E9%97%B4%E4%BB%B6%E6%BC%8F%E6%B4%9E/Apache%20Struts2%20S2-062%20%E8%BF%9C%E7%A8%8B%E4%BB%A3%E7%A0%81%E6%89%A7%E8%A1%8C%E6%BC%8F%E6%B4%9E%20CVE-2021-31805.md POC Details
11 Apache Struts2 S2-062远程代码执行漏洞(CVE-2021-31805) | 反弹Shell https://github.com/SecNN/Struts2_S2-062_CVE-2021-31805 POC Details
12 Apache Struts2 S2-062(CVE-2021-31805)远程代码执行批量检测（无利用） https://github.com/JordanANDJohn/CVE-2021-31805-POC POC Details
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III. Intelligence Information for CVE-2021-31805

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Vendor Advisories for CVE-2021-31805 (2)

Mailing List Discussions for CVE-2021-31805 (1)

Other References for CVE-2021-31805 (1)

Same Patch Batch · Apache Software Foundation · 2022-04-12 · 3 CVEs total

CVE-2021-28544 Apache Subversion SVN authz protected copyfrom paths regression
CVE-2022-24070 Apache Subversion mod_dav_svn is vulnerable to memory corruption

IV. Related Vulnerabilities

Same product: Apache Struts
Same vendor: Apache Software Foundation
Same weakness: CWE-917

V. Comments for CVE-2021-31805

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