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<base href="https://bugs.freedesktop.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - NULL pointer dereference at JBIG2Stream.cc:1316"
href="https://bugs.freedesktop.org/show_bug.cgi?id=101524">101524</a>
</td>
</tr>
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<th>Summary</th>
<td>NULL pointer dereference at JBIG2Stream.cc:1316
</td>
</tr>
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<th>Product</th>
<td>poppler
</td>
</tr>
<tr>
<th>Version</th>
<td>unspecified
</td>
</tr>
<tr>
<th>Hardware</th>
<td>Other
</td>
</tr>
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<th>OS</th>
<td>All
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
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<th>Priority</th>
<td>medium
</td>
</tr>
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<th>Component</th>
<td>general
</td>
</tr>
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<th>Assignee</th>
<td>poppler-bugs@lists.freedesktop.org
</td>
</tr>
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<th>Reporter</th>
<td>foca@salesforce.com
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=132094" name="attach_132094" title="Proof of concept">attachment 132094</a> <a href="attachment.cgi?id=132094&action=edit" title="Proof of concept">[details]</a></span>
Proof of concept
There is a NULL pointer dereference in JBIG2Stream.cc:1316:
1311 n = (int)(dataEnd - dataPtr);
1312 } else {
1313 n = nChars;
1314 }
1315 for (i = 0; i < n; ++i) {
1316 buffer[i] = *dataPtr++ ^ 0xff; //NULL dereference
1317 }
1318 return n;
1319 }
dataPtr is NULL. dataPtr is set at:
1235 void JBIG2Stream::reset() {
....
1258 if (pageBitmap) {
1259 dataPtr = pageBitmap->getDataPtr();
1260 dataEnd = dataPtr + pageBitmap->getDataSize();
1261 } else {
But in some scenarios pageBitmap->getDataPtr() returns NULL. And there is no
check to deal with that case.
A PoC is attached. To reproduce the bug use:
pdftocairo -svg PoC.pdf
This vulnerability has been found by Offensive Research at Salesforce.com:
Alberto Garcia (@algillera), Francisco Oca (@francisco_oca) & Suleman Ali
(@Salbei_)</pre>
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