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<p><b>Standards</b><br/>
<a href="/confluence/display/seccode/CERT+Secure+Coding+Standards" title="CERT Secure Coding Standards">Overview</a><br/>
<a href="/confluence/display/seccode/CERT+C+Secure+Coding+Standard" title="CERT C Secure Coding Standard">C Language</a><br/>
<a href="/confluence/pages/viewpage.action?pageId=637" title="CERT C++ Secure Coding Standard">C++</a></p>

<p><b>CERT Websites</b><br/>
<a href="http://www.cert.org/" rel="nofollow">CERT</a><br/>
<a href="http://www.cert.org/secure-coding" rel="nofollow">Secure Coding</a><br/>
<a href="http://www.cert.org/tech_tips/" rel="nofollow">Tech Tips</a></p>

<p><b>CERT Employment</b> <br/>
<a href="http://www.cert.org/jobs/" rel="nofollow"><b>Opportunities</b></a></p>

<p><b>Related Sites</b><br/>
<a href="http://www.us-cert.gov/" rel="nofollow"><img src="https://www.cert.org/images/logo/uscert_4g_sm.jpg" align="absmiddle" border="0" /></a><br/>
<a href="http://www.cylab.cmu.edu/" title="http://www.cylab.cmu.edu/" rel="nofollow"><img src="https://www.cert.org/images/logo/cylab_alt.jpg" align="absmiddle" border="0" /></a></p></td></tr></table></div></td></tr></tbody></table>

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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.

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.

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]);
  }
}

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.

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
  }
}

Risk Assessment

TODO

Rule	Severity	Likelihood	Remediation Cost	Priority	Level
SEC00-J	??	??	??	P??	L??

Automated Detection

TODO

References

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function addHiddenElement(form, name, value)

Unknown macro: { 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'/>.
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</table>
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<ul class="tabnav" style="border-bottom: 0; width: 400px">
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</ul>

<br class="after-tabnav">

/*---------------------------------------------------------------------------
Redefine the following two methods without calls to editorHasContentChanged()
---------------------------------------------------------------------------*/
function hasContentChanged()

Unknown macro: { return contentHasChangedSinceLastAutoSave; }

function resetContentChanged()

Unknown macro: { contentHasChangedSinceLastAutoSave = false; }

</script>

<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.

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.

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]);
  }
}

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.

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
  }
}

References

Secure coding in Java http://java.sun.com/security/seccodeguide.html</textarea>
</div>
</div>
<input id="selectedText" name="selectedText" type="hidden">

<input type="hidden" name="sel1"><!-sel1: text before the selection->
<input type="hidden" name="sel2"><!-sel2: text after the selection->

<script type="text/javascript">
DraftAjax.getDraftSaveInterval(
function (interval)

Unknown macro: { setInterval("saveDraft()", interval); }

);
if ('18186675' != '0')
{
heartbeat();
HeartbeatAjax.getHeartbeatInterval(
function (interval)

Unknown macro: { setInterval("heartbeat()", interval); }

);
}

function contentChangeHandler()

Unknown macro: { contentHasChangedSinceLastAutoSave = true; }

</script> </div>
</div>

<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>

<div class="inputSection">

<script type="text/javascript">
Array.prototype.indexOf = function(object)

Unknown macro: { 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)

Unknown macro: { return !values.include(value); }

);
}

String.prototype.strip = function()

Unknown macro: { return this.replace(/^s+/, '').replace(/s+$/, ''); }

</script>

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->

Unknown macro: { $('labels_info').innerHTML = $('labelsString').value.toLowerCase(); $('labels_edit_link').innerHTML = "EDIT"; highlight($('labels_info')); }

else

Unknown macro: { SuggestedLabelsForEntity.viewLabels('18186675', "labels/editpage-suggestedlabels.vm", loadSuggestedLabels); $('labels_edit_link').innerHTML = "DONE"; }

}

function loadSuggestedLabels(ajaxResponse)
{
if (ajaxResponse.success)

Unknown macro: { $('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>

Unknown macro: { tokens}

);</script>
</td>
<td valign="top">
<div id="suggestedLabelsSpan" style="margin-top:5px;">

</div>
</td>
</tr>
</table>
</div>

Unknown macro: { 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;">
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<div class="rightpanel">
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<img src="/confluence/images/icons/help_16.gif" height=16 width=16 border=0 align=absmiddle title="Help Tips">
Help Tips
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<p>
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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/>
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</p>
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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] » Custom link title
</span>
</p>
<p>
Tables:<br/>
<span class="smalltext">

head1

head2

<br/>

colA1

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colB1

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</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>
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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"/>
<area shape="rect" coords="241,3,341,19" href="http://www.cmu.edu/" alt="Carnegie Mellon University" />
</map>
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Noncompliant Code Example

Compliant Solution

Risk Assessment

Automated Detection

References

Noncompliant Code Example

Compliant Solution

References

Large heading!<br />

Medium heading<br/>

Small heading...<br/>

head1	head2	<br/>
colA1	colA2	<br/>
colB1	colB2

Space shortcuts

Page tree

SEC00-J. Do not allow exceptions to transmit sensitive information

Noncompliant Code Example

Compliant Solution

Risk Assessment

Automated Detection

References

Noncompliant Code Example

Compliant Solution

References

Large heading!<br />

Medium heading<br/>

Small heading...<br/>