nsa emissary 输出中的特殊元素转义处理不恰当（注入）
CVE编号
CVE-2021-32647利用情况
暂无补丁情况
N/A披露时间
2021-06-01漏洞描述
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) 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.解决建议
建议您更新当前系统或软件至最新版，完成漏洞的修复。
参考链接 |
|
|---|---|
| https://github.com/NationalSecurityAgency/emissary/blob/30c54ef16c6eb6ed09604... | |
| https://github.com/NationalSecurityAgency/emissary/security/advisories/GHSA-p... |
受影响软件情况
| # | 类型 | 厂商 | 产品 | 版本 | 影响面 | ||||
| 1 | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| 运行在以下环境 | |||||||||
| 应用 | nsa | emissary | 6.4.0 | - | |||||
- 攻击路径 网络
- 攻击复杂度 低
- 权限要求 高
- 影响范围 已更改
- 用户交互 无
- 可用性 高
- 保密性 高
- 完整性 高
| CWE-ID | 漏洞类型 |
| CWE-470 | 使用外部可控制的输入来选择类或代码（不安全的反射） |
| CWE-74 | 输出中的特殊元素转义处理不恰当（注入） |
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