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Home arrow SecurityAlert Database

Arrow  Topic :

libpoppler uninitialized pointer


Arrow  SecurityAlert : 3977
Arrow  CVE : CVE-2008-2950
Arrow  CWE : CWE-94
Arrow  SecurityRisk : High  Security Risk High  (About)
Arrow  Remote Exploit : Yes
Arrow  Local Exploit : No
Arrow  Victim interaction required : No
Arrow  Exploit Available : No
Arrow  Credit : Andrea Barisani
Arrow  Published : 09.07.2008

Arrow  Affected Software : Poppler, Poppler, 0.8.4, and previous



Arrow  Advisory Content :  

2008/07/07 #2008-007 libpoppler uninitialized pointer

Description:

The poppler PDF rendering library suffers a memory management bug which
leads
to arbitrary code execution.

The vulnerability is present in the Page class constructor/destructor. The
pageWidgets object is not initialized in the Page constructor if specific
conditions are met, but it is deleted afterwards in the destructor
regardless
of its initialization.

Specific PDF files can be crafted which allocate arbitrary memory to
trigger
the vulnerability.

A new poppler version addressing the issue is scheduled to be released on
July 30th according to maintainer.

The following patch fixes the issue:

diff --git a/poppler/Page.cc b/poppler/Page.cc
index b28a3ee..72a706b 100644
--- a/poppler/Page.cc
+++ b/poppler/Page.cc
@@ -230,7 +230,7 @@ GBool PageAttrs::readBox(Dict *dict, char *key,
PDFRectangle *box) {

Page::Page(XRef *xrefA, int numA, Dict *pageDict, PageAttrs *attrsA, Form
*form) {
Object tmp;
-
+ pageWidgets = NULL; //Security fix
ok = gTrue;
xref = xrefA;
num = numA;

Affected version:

poppler <= 0.8.4

Fixed version:

poppler, N/A

Credit: vulnerability report, patch and PoC code received from Felipe
Andres
Manzano <fmanzano [at] fceia [dot] unr [dot] edu [dot] ar>.

CVE: CVE-2008-2950

Timeline:
2008-06-27: vulnerability report received
2008-06-28: contacted poppler maintainers and affected vendors
2008-06-30: maintainer confirms issue and patch
2008-07-07: advisory release

References:

Links:
http://poppler.freedesktop.org

Permalink:
http://www.ocert.org/advisories/ocert-2008-007.html

--
Andrea Barisani | Founder & Project Coordinator
oCERT | Open Source Computer Emergency Response Team

<lcars (at) ocert (dot) org [email concealed]>
http://www.ocert.org
0x864C9B9E 0A76 074A 02CD E989 CE7F AC3F DA47 578E 864C 9B9E
"Pluralitas non est ponenda sine necessitate"



Arrow  References :

http://www.securityfocus.com/archive/1/archive/1/493980/100/0/threaded
http://www.ocert.org/advisories/ocert-2008-007.html




Arrow  Feedback :

If you have additional information or notice any errors regarding this security advisory, please use contact form or email us at info()securityreason()com.
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