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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 in GooString.h:121"
href="https://bugs.freedesktop.org/show_bug.cgi?id=101505">101505</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>NULL pointer dereference in GooString.h:121
</td>
</tr>
<tr>
<th>Product</th>
<td>poppler
</td>
</tr>
<tr>
<th>Version</th>
<td>unspecified
</td>
</tr>
<tr>
<th>Hardware</th>
<td>Other
</td>
</tr>
<tr>
<th>OS</th>
<td>All
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>medium
</td>
</tr>
<tr>
<th>Component</th>
<td>general
</td>
</tr>
<tr>
<th>Assignee</th>
<td>poppler-bugs@lists.freedesktop.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>foca@salesforce.com
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=132070" name="attach_132070" title="Proof of concept">attachment 132070</a> <a href="attachment.cgi?id=132070&action=edit" title="Proof of concept">[details]</a></span>
Proof of concept
There is a NULL pointer dereference.
The SIGSEGV happens in GooString.h:121:
121 char *getCString() { return s; }
But the problem comes from GfxFont.cc:826:
825 //----- CID font substitution
826 if ((path = globalParams->findCCFontFile(
827 ((GfxCIDFont
*)this)->getCollection()))) {
828 if ((fontLoc = getExternalFont(path, gTrue))) {
((GfxCIDFont *)this)->getCollection()) return NULL, and this is not checked in
this function or in any of the following functions until the NULL dereference
happens at getCString:
#0 0x000000000040b480 in GooString::getCString (this=0x0) at
../goo/GooString.h:121
#1 0x00000000004a67c9 in GooHash::hash (this=0x7fc350, key=0x0) at
GooHash.cc:369
#2 0x00000000004a66b5 in GooHash::find (this=0x7fc350, key=0x0,
h=0x7fffffffd414) at GooHash.cc:342
#3 0x00000000004a5e21 in GooHash::lookup (this=0x7fc350, key=0x0) at
GooHash.cc:136
A possible solution is to verify that the returned value of getCollection is !=
NULL:
826 if (((GfxCIDFont *)this)->getCollection() != NULL && (path =
globalParams->findCCFontFile(
827 ((GfxCIDFont
*)this)->getCollection()))) {
PoC is attached.
This vulnerability has been found by Offensive Research at Salesforce.com:
Alberto Garcia (@algillera), Francisco Oca (@francisco_oca) & Suleman Ali
(@Salbei_)</pre>
</div>
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