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CVE-2021-32647— Post-authentication Remote Code Execution (RCE) in emissary:emissary

Quick assessment

Affected
NationalSecurityAgency emissary
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.

Emissary是一个应用软件。一个基于P2P的数据驱动的工作流引擎，可在异构的可能广泛分布的多层P2P网络计算资源中运行。 Emissary存在安全漏洞，该漏洞容易受到认证后远程代码执行(RCE)的攻击。

CVSS 8.0 · High EPSS 2.85% · P86

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter
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I. Basic Information for CVE-2021-32647

Vulnerability Information
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Vulnerability Title
Post-authentication Remote Code Execution (RCE) in emissary:emissary
Source: CVE Program / CVE List V5
Vulnerability Description
Emissary is a P2P based data-driven workflow engine. Affected versions of Emissary are vulnerable to post-authentication Remote Code Execution (RCE). The [`CreatePlace`](https://github.com/NationalSecurityAgency/emissary/blob/30c54ef16c6eb6ed09604a929939fb9f66868382/src/main/java/emissary/server/mvc/internal/CreatePlaceAction.java#L36) REST endpoint accepts an `sppClassName` parameter which is used to load an arbitrary class. This class is later instantiated using a constructor with the following signature: `<constructor>(String, String, String)`. An attacker may find a gadget (class) in the application classpath that could be used to achieve Remote Code Execution (RCE) or disrupt the application. Even though the chances to find a gadget (class) that allow arbitrary code execution are low, an attacker can still find gadgets that could potentially crash the application or leak sensitive data. As a work around disable network access to Emissary from untrusted sources.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H
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
Emissary 注入漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Emissary是一个应用软件。一个基于P2P的数据驱动的工作流引擎，可在异构的可能广泛分布的多层P2P网络计算资源中运行。 Emissary存在安全漏洞，该漏洞容易受到认证后远程代码执行(RCE)的攻击。
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
NationalSecurityAgency emissary = 6.4.0 -

II. Public POCs for CVE-2021-32647

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III. Intelligence Information for CVE-2021-32647

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Patches & Fixes for CVE-2021-32647 (1)

Vendor Advisories for CVE-2021-32647 (1)

IV. Related Vulnerabilities

Same product: emissary
Same vendor: NationalSecurityAgency
Same weakness: CWE-74

V. Comments for CVE-2021-32647

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