exploit the possibilities

pdflib-overflows.txt

pdflib-overflows.txt
Posted Dec 24, 2007
Authored by poplix | Site px.dynalias.org

pdflib, a library used for generating PDFs on the fly, suffers from multiple buffer overflow vulnerabilities due to the use of strcpy().

tags | advisory, overflow, vulnerability
MD5 | 5b5319a4404f4f00c7533d2437c848fa

pdflib-overflows.txt

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hi,
pdflib, a library for generating PDF on the fly, avilable at http://
www.pdflib.com, is vulnerable to multiple bufferoverflows due to a
misuse of strcpy().
An attacker can exploit this issue to execute arbitrary code or to
crash the application that uses the library.
One of the vulnerable functions is pdc_fsearch_fopen() that is
called, for example, by PDF_load_image() which overflows a stack
buffer if a long filename is provided.
The php wrapper for pdflib (pecl extension) is also vulnerable so
please take care of allowing users to generate custom pdfs from webapps.

this is a proof-of-concept that crashes php:
<?php
.....
PDF_load_image($p,"jpeg",str_repeat("A",1100), null);

?>


The developers have been warned and they plained to fix those bugs in
the next release.


cheers,
-poplix
http://px.dynalias.org

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