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SEC00-A. Do not allow exceptions to transmit sensitive information
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name="originalContent" value="Propagating the content of exceptions without performing explicit filtering is often associated with information leakage. An attacker may craft input parameters such that underlying structures and mechanisms may get exposed inadvertently.
h2. Noncompliant Code Example
This example demonstrates code that accepts a file name as an input argument on which operations are to be performed. An attacker can gain insights on the underlying file system structure by repeatedly passing different paths to fictitious files. When a file is not found, the {{FileInputStream}} constructor throws a {{FileNotFoundException}}. Other risks such as revelation of the user's home directory and as a result the user name also manifest themselves.
{code:bgColor=#FFcccc}
import java.io.FileInputStream;
import java.io.FileNotFoundException;
class exception {
public static void main(String[] args) throws FileNotFoundException {
FileInputStream dis = new FileInputStream("c:\\" + args[1]);
}
}
{code}
h2. Compliant Solution
Information leakage can result from both the exception message text and the type of exception. With {{FileNotFoundException}}, the message reveals the file system layout while the type conveys the absence of the file. The same exception must be caught while taking special care to sanitize the message before propagating it to the caller. In cases where the exception type itself can reveal too much, consider throwing a different exception (with a different message) altogether.
{code:bgColor=#ccccff}
import java.io.FileInputStream;
import java.io.FileNotFoundException;
class exception {
public static void main(String[] args) {
try {
FileInputStream dis = new FileInputStream("c:\\" + args[1]);
}
catch(FileNotFoundException fnf) {
System.out.println("Error: Operation could not be performed");
} //sanitized message
}
}
{code}
h2. Risk Assessment
TODO
|| Rule || Severity || Likelihood || Remediation Cost || Priority || Level ||
| SEC00-J | ?? | ?? | ?? | P?? | L?? |
h3. Automated Detection
TODO
h2. References
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else if (!defaultIsWysiwyg && form.mode.value == 'richtext')
{ showRichTextDefault = true; }
$('makeRichTextDefault').style.display = (showRichTextDefault ? 'inline' : 'none');
$('makeMarkupDefault').style.display = (showMarkupDefault ? 'inline' : 'none');
}
// Save the last edit mode in case the user changes to preview and from there to the other edit mode...
// then we will have to convert the markup to XHTML or vice verca.
var lastEditMode;
var lastKnownGoodContent = null;
function inRichTextMode()
{ var form = getCurrentForm(); return form.mode.value == 'richtext'; }
function changeMode(mode)
{
var form = getCurrentForm();
if (form.mode.value != mode)
{
showWaitImage(true);
if (mode == 'markup') // going from wysiwyg to markup
{
// If the current mode is preview...
if (form.mode.value == 'preview')
{
// Markup -> Preview -> Markup
// We don't need to do any conversion...
if(lastEditMode == 'markup')
{ reply_setTextArea(null); }
// WYSIWYG -> Preview -> Markup
// Convert the WYSIWYG html to wiki markup
else
{ WysiwygConverter.convertXHtmlToWikiMarkupWithoutPage(lastKnownGoodContent,contentId,reply_setTextArea); }
}
// WYSIWYG -> Markup, so just convert
else
{ WysiwygConverter.convertXHtmlToWikiMarkupWithoutPage(getEditorHTML() + "",contentId,reply_setTextArea); }
}
else if (mode == 'richtext')// going from markup to wysiwyg
{
var textarea = $('markupTextarea');
// If the current mode is preview...
if (form.mode.value == 'preview')
{
// WYSIWYG -> Preview -> WYSIWYG
// We don't need to reload or convert the contents of the tinyMCE editor
if(lastEditMode == 'richtext')
{ reply_setEditorValue(null); }
// Markup -> Preview -> WYSIWYG
// Convert the markup to be used with WYSIWYG
else
{ WysiwygConverter.convertWikiMarkupToXHtmlWithoutPage(textarea.value,contentId, reply_setEditorValue); }
}
// Markup -> WYSIWYG, so just grab the contents of the markup textarea and convert it to be used with WYSIWYG
else
{ WysiwygConverter.convertWikiMarkupToXHtmlWithoutPage(textarea.value,contentId, reply_setEditorValue); }
}
else // viewing the preview
{
// WYSIWYG -> Preview
if (form.mode.value == 'richtext')
{ lastEditMode = 'richtext'; var html = getEditorHTML() + ""; lastKnownGoodContent = html; WysiwygConverter.convertToPreview(html,contentId, 'java', 'richtext', reply_setPreviewArea); }
// Markup -> Preview
else
{ lastEditMode = 'markup'; var textarea = $('markupTextarea'); WysiwygConverter.convertToPreview(textarea.value, contentId, 'java', 'markup', reply_setPreviewArea); }
}
}
}
var contentHasChangedSinceLastAutoSave = false;
function saveDraft(callback)
{
if (!callback)
callback = function() {};
var form = getCurrentForm();
if (hasContentChanged())
{
var draftData = new Object();
draftData.pageId = '18186675';
if (form.title)
{ draftData.title = form.title.value; }
if (form.newSpaceKey)
{ draftData.spaceKey = form.newSpaceKey.value; }
else
{ draftData.spaceKey = 'java'; }
if (form.originalVersion)
{ draftData.pageVersion = parseInt(form.originalVersion.value); }
draftData.type='page';
draftData.content = getCurrentFormContent(form);
DraftAjax.saveDraft(draftData, form.xhtml.value == 'true', callback);
resetContentChanged();
}
else
{ // must call the call back even if we don't save a draft! callback(); }
}
function heartbeat()
{
HeartbeatAjax.startActivity('18186675', 'page',
function (activityResponses)
{
if (activityResponses.length > 0)
{
$('heartbeatDiv').style.display = 'block';
var html = "";
var sep = "";
for (i = 0; i < activityResponses.length; ++i)
{ var activityResponse = activityResponses[i] var usernamelink = '<a href="/confluence/display/~' + activityResponse.userName + '">' + activityResponse.fullName + '</a>'; var lastEditDateMessage = ''; if (activityResponse.lastEditDate != null) lastEditDateMessage = '<span class="smalltext">(last edit ' + activityResponse.lastEditDate + ')</span>'; html += sep + usernamelink + ' ' + lastEditDateMessage; sep = ", "; }
$('otherUsersSpan').innerHTML = html;
}
else
{ $('heartbeatDiv').style.display = 'none'; }
}
);
}
function getCurrentForm()
{ return document.forms['editpageform']; }
// Fallback function for Safari to show to submit the form via JavaScript and display the preview page.
function sendFormWithPreview()
{ form = getCurrentForm(); // create a hidden field for the update variable var el = document.createElement("input"); el.type = "hidden"; el.name = "preview"; el.name = "preview"; el.value = "preview"; form.appendChild(el); form.submit(); }
// function to send the form to discard/use the draft
function sendFormDraft(flagName)
{
form = getCurrentForm();
addHiddenElement(form, flagName, "true");
addHiddenElement(form, "pageId", "18186675");
if (!form.spaceKey)
{ addHiddenElement(form, "spaceKey", "java"); }
form.action="edit${draft.draftType}.action";
form.submit();
}
function addHiddenElement(form, name, value)
{ var el = document.createElement("input"); el.type = "hidden"; el.name = name; el.value = value; form.appendChild(el); }
</script>
<div id='heartbeatDiv' style="display: none;">
<table style="clear: right" cellpadding='5' width='100%' cellspacing='8px' class='noteMacro' border="0" align='center'>
<tr><td valign='top' width="1%"><img src="/confluence/images/icons/emoticons/warning.gif" width="16" height="16" align="absmiddle" alt="" border="0"></td><td>
This page is being edited by <span id='otherUsersSpan'/>.
</td></tr>
</table>
</div>
<ul class="tabnav" style="border-bottom: 0; width: 400px">
<li class="tabs">
<a id="markupTab" class="current" href="#" onClick="javascript:changeMode('markup');return false;">Wiki Markup</a>
<a id="previewTab" href="#" onClick="javascript:sendFormWithPreview();return false;">Preview</a>
</li>
<li class="nontabs" style="margin: 8px 0pt 0pt 3px"><img id="wysiwygWaitImage" style="visibility:hidden" alt="Wait Image" border=0 src="/confluence/images/icons/wait.gif"></li>
</ul>
<!-- clears the floated elements above -->
<br class="after-tabnav">
<div style="background-color:#D6D6D6; border:1px solid #CCC; border-bottom:0; " id='linkinserters'>
<a style="text-decoration: none" href="#" onClick="storeTextareaBits(); window.open('/confluence/users/insertimageinpage.action?pageId=18186675&formname=editpageform&fieldname=content&mode=search','link_image_inserter', 'width=700, height=400, resizable, scrollbars=yes'); return false;" title="Insert Image">
<img src="/confluence/images/icons/confimage.gif" border="0px" title="Insert Image">
</a>
<a style="text-decoration: none" href="#" onClick="storeTextareaBits(); window.open('/confluence/users/insertlink.action?pageId=18186675¤tspace=java&formname=editpageform&fieldname=content' + (document.getElementById('selectedText').value ? '&alias=' + document.getElementById('selectedText').value : ''),'link_inserter', 'width=620, height=480, resizable, scrollbars=yes'); return false;" title="Insert Link">
<img src="/confluence/images/icons/conflink.gif" border="0px" title="Insert Link">
</a>
</div>
<script type="text/javascript">
var useWysiwyg = false;
/*---------------------------------------------------------------------------
Redefine the following two methods without calls to editorHasContentChanged()
---------------------------------------------------------------------------*/
function hasContentChanged()
{ return contentHasChangedSinceLastAutoSave; }
function resetContentChanged()
{ contentHasChangedSinceLastAutoSave = false; }
</script>
<script type="text/javascript" src="/confluence/s/1116/1/_/dwr/engine.js"></script>
<!-- request this the traditional way to fix CONF-5561 -->
<script type="text/javascript" src="/confluence/s/1116/1/_/wysiwyg-javascript"></script>
<div id="markup" >
<div>
<textarea id="markupTextarea" name="content"
cols=""
rows="30"
tabindex="5" onclick="storeCaret(this);"
onselect="storeCaret(this); storeTextareaBits()"
onkeyup="storeCaret(this);contentChangeHandler();"
onchange="contentChangeHandler();"
style="padding:0; margin:0; width:100%; "
class="monospaceInput"
>Propagating the content of exceptions without performing explicit filtering is often associated with information leakage. An attacker may craft input parameters such that underlying structures and mechanisms may get exposed inadvertently.
h2. Noncompliant Code Example
This example demonstrates code that accepts a file name as an input argument on which operations are to be performed. An attacker can gain insights on the underlying file system structure by repeatedly passing different paths to fictitious files. When a file is not found, the {{FileInputStream}} constructor throws a {{FileNotFoundException}}. Other risks such as revelation of the user's home directory and as a result the user name also manifest themselves.
{code:bgColor=#FFcccc}
import java.io.FileInputStream;
import java.io.FileNotFoundException;
class exception {
public static void main(String[] args) throws FileNotFoundException {
FileInputStream dis = new FileInputStream("c:\\" + args[1]);
}
}
{code}
h2. Compliant Solution
Information leakage can result from both the exception message text and the type of exception. With {{FileNotFoundException}}, the message reveals the file system layout while the type conveys the absence of the file. The same exception must be caught while taking special care to sanitize the message before propagating it to the caller. In cases where the exception type itself can reveal too much, consider throwing a different exception (with a different message) altogether.
{code:bgColor=#ccccff}
import java.io.FileInputStream;
import java.io.FileNotFoundException;
class exception {
public static void main(String[] args) {
try {
FileInputStream dis = new FileInputStream("c:\\" + args[1]);
}
catch(FileNotFoundException fnf) {
System.out.println("Error: Operation could not be performed");
} //sanitized message
}
}
{code}
h2. References
Secure coding in Java http://java.sun.com/security/seccodeguide.html</textarea>
</div>
</div>
<input id="selectedText" name="selectedText" type="hidden">
<!-- two hidden fields to store textarea parts for mozilla based browsers -->
<input type="hidden" name="sel1"><!--sel1: text before the selection-->
<input type="hidden" name="sel2"><!--sel2: text after the selection-->
<input type="hidden" name="inPreview" value="false"/>
<input type="hidden" name="mode" value="markup"/>
<input type="hidden" name="xhtml" value="false"/>
<div id="preview" style="display: none ; border:1px solid #CCCCCC; background-color:white;">
<div id="previewArea" style="margin:5px;"></div>
</div>
<!-- javascript code to initialise draft and heartbeat ajax -->
<script type="text/javascript">
DraftAjax.getDraftSaveInterval(
function (interval) { setInterval("saveDraft()", interval); }
);
if ('18186675' != '0')
{
heartbeat();
HeartbeatAjax.getHeartbeatInterval(
function (interval) { setInterval("heartbeat()", interval); }
);
}
function contentChangeHandler()
{ contentHasChangedSinceLastAutoSave = true; }
</script> </div>
</div>
<!-- comment field and minor edit checkbox -->
<div class="inputSection">
<div style="float:right">
<input id="minorEdit" type="checkbox" name="minorEdit" value="true" />
<label for="minorEdit">
<span class="smalltext"><b>Minor change?</b> (no notifications will be sent)</span>
</label>
</div>
<span class="formtitle">Comment:</span>
<input type="text"
name="versionComment"
size="40" tabindex="6" class="monospaceInput" style="width: 50%" /> </div>
<!-- Page permissions -->
<div class="inputSection">
<!-- Copy some methods out of prototype 1.5 since we can't rev to it yet due to it causing a memory leak in jwebunit 1.2 and hence our func tests -->
<!-- this block of javascript can be removed when we rev to prototype 1.5 -->
<script type="text/javascript">
Array.prototype.indexOf = function(object)
{ for (var i = 0, length = this.length; i < length; i++) if (this[i] == object) return i; return -1; }
Array.prototype.without = function()
{
var values = $A(arguments);
return this.select(function(value)
{ return !values.include(value); });
}
String.prototype.strip = function()
{ return this.replace(/^s+/, '').replace(/s+$/, ''); }
</script>
<script type="text/javascript">
var viewPagePermissions = new PagePermissions();
var editPagePermissions = new PagePermissions();
var viewPermissionManager = new PermissionManager(PagePermissionType.VIEW);
var editPermissionManager = new PermissionManager(PagePermissionType.EDIT);
var currentPermissionManager = viewPermissionManager;
i18n['done.name.caps'] = 'DONE';
i18n['edit.name.caps'] = 'EDIT';
i18n['page.perms.viewing.restricted'] = 'Viewing restricted to:';
i18n['page.perms.editing.restricted'] = 'Editing restricted to:';
i18n['page.perms.no.view.restrictions'] = 'No viewing restrictions set on this page';
i18n['page.perms.no.edit.restrictions'] = 'No editing restrictions set on this page';
i18n['page.perms.duplicate.names'] = 'Duplicate user or group name(s):';
i18n['page.perms.invalid.entity.names'] = 'Invalid user or group name(s):';
</script>
</div>
<!--labels section-->
<script>
function toggleLabels()
{
toggleVisibility('labels_div');
toggleVisibility('labels_info');
if($('labels_div').style.display == 'none')
{ $('labels_info').innerHTML = $('labelsString').value.toLowerCase(); $('labels_edit_link').innerHTML = "EDIT"; highlight($('labels_info')); }
else
{ SuggestedLabelsForEntity.viewLabels('18186675', "labels/editpage-suggestedlabels.vm", loadSuggestedLabels); $('labels_edit_link').innerHTML = "DONE"; }
}
function loadSuggestedLabels(ajaxResponse)
{
if (ajaxResponse.success)
{ $('suggestedLabelsSpan').innerHTML = ajaxResponse.response; }
}
</script>
<div id="labels_tab">
<span class="formtitle">Labels: </span><span onclick="toggleLabels()" class="inline-control-link fontSizeTiny" id="labels_edit_link">EDIT</span>
</div>
<div id="labels_info">
incomplete
</div>
<div id="labels_div" class="toggleFormDiv" style="padding: 8px; display:none">
<table width="100%">
<tr>
<td width="60%" valign="top">
<span class="error">
<span class="errorMessage" id="errorSpan"></span>
</span>
<input autocomplete="off" type="text" id="labelsString" name="labelsString" value="incomplete" class="monospaceInput" style="width:100%;" />
<div class="smalltext"><em>Tip:</em> Looking for a label? Just start typing.</div>
<div class="auto_complete" id="labelsAutocompleteList"></div>
<script>new Ajax.Autocompleter('labelsString', 'labelsAutocompleteList', '18186675', { tokens: new Array(',', ' '), dwrFunction: GenerateAutocompleteLabelsListForEntity.autocompleteLabels});</script>
</td>
<td valign="top">
<div id="suggestedLabelsSpan" style="margin-top:5px;">
</div>
</td>
</tr>
</table>
</div>
<script>
</script>
<div>
<div class="submitButtons">
<input
tabindex="102" accessKey="s" type="submit" name="confirm" value="Save"/>
<input
tabindex="104" type="submit" name="cancel" value="Cancel"/> </div>
</div>
</div>
</div>
</form>
<script type="text/javascript">
(function() {
$A(document.getElementsByClassName("submitButtons")).each(function(div) {
$A(div.getElementsByTagName("input")).each(function(button) { Event.observe(button, "click", pageFormSubmit, false); });
});
})();
</script>
</div>
</div>
</td>
<td valign="top" id="helptd" style="display:block; width:200px; border-top:1px solid #CCC;">
<div style="padding-left:5px;">
<div class="rightpanel">
<div id="helpheading">
<img src="/confluence/images/icons/help_16.gif" height=16 width=16 border=0 align=absmiddle title="Help Tips">
Help Tips
</div>
<div id="helpcontent">
<p>
<b>Notation Help:</b>
(<a href="#" onClick="window.open('/confluence/renderer/notationhelp.action','notation_help','width=780, height=580, resizable, scrollbars')">full guide</a>)
<br/>
Text formatting:<br/>
<span class="smalltext">
*bold* » <b class="strong">bold</b><br/>
_italic_ » <em class="emphasis">italic</em><br/>
-strike- » <del class="deleted">strike</del><br/>
+under+ » <u>under</u><br/>
</span>
</p>
<p>
Headings:<br/>
<span class="smalltext">
h1. Large heading!<br />
h3. Medium heading<br/>
h5. Small heading...<br/>
</span>
</p>
<p>
Lists:<br/>
<span class="smalltext">
* Bulleted point<br />
# Numbered point<br/>
</span>
</p>
<p>
Linking:<br/>
<span class="smalltext">
[title#anchor] » Link a page<br/>
[dev:title#anchor] » In space with 'dev'<br/>
[http://host.com] » Remote link<br/>
[phrase@shortcut] » Shortcut<br/>
<b><i>Note:</i></b> [alias|any_of_above_links] » Custom link title
</span>
</p>
<p>
Tables:<br/>
<span class="smalltext">
||head1||head2||<br/>
|colA1|colA2|<br/>
|colB1|colB2|
</span>
</p>
Details and full examples are in the
<a href="/confluence/renderer/notationhelp.action" onClick="window.open(this.href,'notation_help','width=680, height=440, resizable, scrollbars'); return false;">full notation guide »</a>
</div>
</div>
</div>
</td>
</tr>
</table>
<!-- End inner content table -->
</td>
</tr>
</table>
</div>
<div class="bottomshadow"></div>
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Powered by <a href="http://www.atlassian.com/software/confluence" class="smalltext">Atlassian Confluence</a> 2.7.3, the <a href="http://www.atlassian.com/software/confluence" class="smalltext">Enterprise Wiki</a>.
<a href="http://jira.atlassian.com/secure/BrowseProject.jspa?id=10470" class="smalltext">Bug/feature request</a>
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<map name="footermap" id="footermap">
<area shape="rect" coords="2,2,233,19" href="http://www.sei.cmu.edu/" alt="Software Engineering Institute"/>
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</map>
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<td width="50%" align="right">
<span style="font-size:11px; color:#ffffff; font-family:Verdana">
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