漏洞描述
Apache Tapestry 5.4.5、5.5.0、5.6.2 and 5.7.0。在CVE-2019-0195中，通过操纵classpath资产文件URL，攻击者可以在classpath中猜测文件的路径，然后下载该文件。攻击者可以通过请求包含HMAC秘钥的URL这个类通常包含用于对序列化的Java对象进行签名的HMAC秘钥，在知道该密钥的情况下，攻击者就可以签署Java小工具链（例如ysoserial的CommonsBeanUtils1），最终导致远程代码执行。
Apache Tapestry远程代码执行(CVE-2021-27850 )
PoC代码
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