Multiple vulnerabilities in OpenEMR

[advisory@xxxxxxxxxxx]

Advisory ID: HTB23069
Product: OpenEMR
Vendor: OEMR
Vulnerable Version: 4.1.0 and probably prior
Tested Version: 4.1.0
Vendor Notification: 11 January 2012 
Vendor Patch: 29 January 2012 
Public Disclosure: 01 February 2012 
Vulnerability Type: Local File Inclusion, Arbitrary Command Execution
Solution Status: Fixed by Vendor
Risk Level: High 
Credit: High-Tech Bridge SA Security Research Lab ( 
https://www.htbridge.ch/advisory/ ) 

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Advisory Details:

High-Tech Bridge SA Security Research Lab has discovered multiple 
vulnerabilities in OpenEMR, which can be exploited to perform local file 
inclusion and arbitrary command execution attacks.

1) Multiple Local File Inclusion vulnerabilities in OpenEMR

1.1 Input passed via the "formname" GET parameter to 
/contrib/acog/print_form.php is not properly verified before being used to 
include local files. 
This can be exploited to include local files via directory traversal sequences 
and URL-encoded NULL bytes.

The following PoC (Proof of Concept) demostrates the vulnerability:

http://[host]/contrib/acog/print_form.php?formname=../../../etc/passwd%00

1.2 Input passed via the "formname" GET parameter to 
/interface/patient_file/encounter/load_form.php, 
/interface/patient_file/encounter/view_form.php and 
/interface/patient_file/encounter/trend_form.php is not properly verified 
before being used to include local files. 
This can be exploited to include local files via directory traversal sequences 
and URL-encoded NULL bytes.

The following PoC (Proof of Concept) demostrate the vulnerabilities:

http://[host]/interface/patient_file/encounter/load_form.php?formname=../../../etc/passwd%00
http://[host]/interface/patient_file/encounter/view_form.php?formname=../../../etc/passwd%00
http://[host]/interface/patient_file/encounter/trend_form.php?formname=../../../etc/passwd%00

Successful exploitation of these vulnerabilities requires that the attacker is 
registered and logged-in.

2) Multiple Arbitrary Command Execution vulnerabilities in OpenEMR

Input passed via "file" parameter to /interface/fax/fax_dispatch.php is not 
properly sanitised before being used in an "exec()" call. 
This can be exploited to execute arbitrary system commands.

The following PoC (Proof of Concept) demostrates the vulnerability:

http://[host]/interface/fax/fax_dispatch.php?file=1%22%20||%20ls%20%3E%20123

Successful exploitation of this vulnerability requires that the attacker is 
registered and logged-in.

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Solution:

Apply Vendor Patch: http://www.open-emr.org/patch/4-1-0-Patch-7.zip
More information: http://www.open-emr.org/wiki/index.php/OpenEMR_Patches

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References:

[1] High-Tech Bridge Advisory HTB23069 - 
https://www.htbridge.ch/advisory/HTB23069 - Multiple vulnerabilities in OpenEMR.
[2] OpenEMR - http://www.open-emr.org/ - OpenEMR is a Free and Open Source 
electronic health records and medical practice management application.

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Disclaimer: The information provided in this Advisory is provided "as is" and 
without any warranty of any kind. Details of this Advisory may be updated in 
order to provide as accurate information as possible. The latest version of the 
Advisory is available on web page [1] in the References.