Program: 21445
Project: 21445
Buggy source:
@Override public PluginStep doStep(PluginStep step,String parameter){
switch (step.getStep()) {
case PluginStep.STEP_DECRYPT:
    Vector<String> decryptedLinks=new Vector<String>();
  RequestInfo reqinfo;
try {
  while (true) {
    reqinfo=getRequest(new URL(parameter));
    String captchaurl="String_Node_Str" + getFirstMatch(reqinfo.getHtmlCode(),CAPTCHAPATTERN,1);
    File file=this.getLocalCaptchaFile(this);
    if (!JDUtilities.download(file,captchaurl) || !file.exists()) {
      logger.severe("String_Node_Str" + captchaurl);
      step.setParameter(null);
      step.setStatus(PluginStep.STATUS_ERROR);
      return step;
    }
    String baseurl="String_Node_Str" + getFirstMatch(reqinfo.getHtmlCode(),FORMLOCATION,1);
    String plainCaptcha=getCaptchaCode(file,this);
    String inpHidden="String_Node_Str" + plainCaptcha + "String_Node_Str"+ getFormInputHidden(reqinfo.getHtmlCode());
    reqinfo=postRequest(new URL(baseurl),inpHidden);
    if (reqinfo.getHtmlCode().contains(ERROR_CAPTCHA)) {
      if (file != null && plainCaptcha != null) {
        JDUtilities.appendInfoToFilename(file,plainCaptcha,false);
      }
      logger.severe("String_Node_Str");
      continue;
    }
 else     if (reqinfo.getHtmlCode().contains(ERROR_CAPTCHA_TIME)) {
      logger.severe("String_Node_Str");
      continue;
    }
    if (file != null && plainCaptcha != null) {
      JDUtilities.appendInfoToFilename(file,plainCaptcha,true);
    }
    break;
  }
  Vector<Vector<String>> links=getAllSimpleMatches(reqinfo.getHtmlCode(),DL_LINK);
  firePluginEvent(new PluginEvent(this,PluginEvent.PLUGIN_PROGRESS_MAX,links.size()));
  for (int i=0; i < links.size(); i++) {
    String link=JDUtilities.urlEncode(links.get(i).get(0));
    link=link.replaceAll("String_Node_Str","String_Node_Str");
    decryptedLinks.add(link);
    firePluginEvent(new PluginEvent(this,PluginEvent.PLUGIN_PROGRESS_INCREASE,null));
  }
  firePluginEvent(new PluginEvent(this,PluginEvent.PLUGIN_PROGRESS_FINISH,null));
  step.setParameter(decryptedLinks);
}
 catch (IOException e) {
  e.printStackTrace();
}
return null;
}
return null;
}

Fixed version (ground truth):
@Override public PluginStep doStep(PluginStep step,String parameter){
switch (step.getStep()) {
case PluginStep.STEP_DECRYPT:
    Vector<String[]> decryptedLinks=new Vector<String[]>();
  RequestInfo reqinfo;
try {
  while (true) {
    Vector<Vector<String>> results=null;
    reqinfo=getRequest(new URL(parameter));
    String htmlCode=reqinfo.getHtmlCode().replaceAll("String_Node_Str","String_Node_Str");
    for (int i=0; i < favorites.length + 1; i++) {
      String favPattern;
      if (favorites.length == i) {
        favPattern="String_Node_Str";
      }
 else {
        String favorit=favorites[i].trim();
        if (favorit.length() == 0)         continue;
        favPattern="String_Node_Str" + favorit + "String_Node_Str";
        ;
      }
      results=getAllSimpleMatches(htmlCode,Pattern.compile(favPattern,Pattern.MULTILINE | Pattern.DOTALL));
      if (results != null && results.isEmpty() == false) {
        break;
      }
    }
    String formURL="String_Node_Str" + host + results.get(0).get(0);
    String postvar=results.get(0).get(2) + "String_Node_Str" + results.get(0).get(3)+ "String_Node_Str"+ results.get(0).get(4)+ "String_Node_Str"+ results.get(0).get(5)+ "String_Node_Str"+ results.get(0).get(6)+ "String_Node_Str"+ results.get(0).get(7)+ "String_Node_Str"+ results.get(0).get(8)+ "String_Node_Str"+ results.get(0).get(9);
    String captchaurl="String_Node_Str" + host + results.get(0).get(1);
    File file=this.getLocalCaptchaFile(this);
    if (!JDUtilities.download(file,captchaurl) || !file.exists()) {
      logger.severe("String_Node_Str" + captchaurl);
      step.setParameter(null);
      step.setStatus(PluginStep.STATUS_ERROR);
      return step;
    }
    String plainCaptcha=getCaptchaCode(file,this);
    String inpHidden="String_Node_Str" + plainCaptcha + "String_Node_Str"+ postvar;
    pw=getFirstMatch(reqinfo.getHtmlCode(),PASSWORT,1);
    if (pw.matches("String_Node_Str") || pw.matches("String_Node_Str") || pw.matches("String_Node_Str")|| pw.matches("String_Node_Str"))     pw=DEFAULT_PASSWORD;
 else     if (pw.matches("String_Node_Str"))     pw="String_Node_Str";
    reqinfo=postRequest(new URL(formURL),inpHidden);
    if (reqinfo.getHtmlCode().contains(ERROR_CAPTCHA)) {
      if (file != null && plainCaptcha != null) {
        JDUtilities.appendInfoToFilename(file,plainCaptcha,false);
      }
      logger.severe("String_Node_Str");
      continue;
    }
 else     if (reqinfo.getHtmlCode().contains(ERROR_CAPTCHA_TIME)) {
      logger.severe("String_Node_Str");
      continue;
    }
    if (file != null && plainCaptcha != null) {
      JDUtilities.appendInfoToFilename(file,plainCaptcha,true);
    }
    break;
  }
  System.out.println(reqinfo.getHtmlCode());
  Vector<Vector<String>> links=getAllSimpleMatches(reqinfo.getHtmlCode(),DL_LINK);
  firePluginEvent(new PluginEvent(this,PluginEvent.PLUGIN_PROGRESS_MAX,links.size()));
  for (int i=0; i < links.size(); i++) {
    String link=JDUtilities.urlEncode(links.get(i).get(0));
    link=link.replaceAll("String_Node_Str","String_Node_Str");
    System.out.println(link);
    decryptedLinks.add(new String[]{link,pw,null});
    firePluginEvent(new PluginEvent(this,PluginEvent.PLUGIN_PROGRESS_INCREASE,null));
  }
  firePluginEvent(new PluginEvent(this,PluginEvent.PLUGIN_PROGRESS_FINISH,null));
  step.setParameter(decryptedLinks);
}
 catch (IOException e) {
  e.printStackTrace();
}
}
return null;
}