Secunia Research: My Firewall Plus Arbitrary File Corruption Vulnerability

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                     Secunia Research 18/03/2005

     - My Firewall Plus Arbitrary File Corruption Vulnerability -

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Table of Contents

Affected Software....................................................1
Severity.............................................................2
Vendor's Description of Software.....................................3
Description of Vulnerability.........................................4
Solution.............................................................5
Time Table...........................................................6
Credits..............................................................7
References...........................................................8
About Secunia........................................................9
Verification........................................................10

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1) Affected Software 

My Firewall Plus 5.0 (build 1117).

NOTE: Other versions may also be affected.

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2) Severity 

Rating: Not critical 
Impact: Manipulation of data, DoS
Where:  Local System

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3) Vendor's Description of Software 

My Firewall Plus:
"Corporate strength firewall for your personal PC".

Product Link:
http://www.webroot.com/products/myfirewallplus/

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4) Description of Vulnerability

Secunia Research has discovered a vulnerability in My Firewall Plus, 
which can be exploited by malicious, local users to manipulate the 
contents of arbitrary files on a vulnerable system.

The vulnerability is caused due to the Log Viewer's export 
functionality saving log files without dropping its privileges first. 
This can be exploited to corrupt arbitrary files on the system with 
logging information.

Successful exploitation requires that the user has access to the Log 
Viewer.

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5) Solution 

Update to My Firewall Plus 5.0 (build 1119) or apply patch.

Patch:
http://www.webroot.com/services/mfp_patch.exe

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6) Time Table 

18/02/2005 - Vendor notified.
22/02/2005 - Vendor response.
18/03/2005 - Public disclosure.

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7) Credits 

Discovered by Carsten Eiram, Secunia Research.

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8) References

The Common Vulnerabilities and Exposures (CVE) project has assigned 
candidate number CAN-2005-0515 for the vulnerability. 
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9) About Secunia 

Secunia collects, validates, assesses, and writes advisories regarding 
all the latest software vulnerabilities disclosed to the public. These 
advisories are gathered in a publicly available database at the 
Secunia website: 

http://secunia.com/

Secunia offers services to our customers enabling them to receive all 
relevant vulnerability information to their specific system 
configuration. 

Secunia offers a FREE mailing list called Secunia Security Advisories: 

http://secunia.com/secunia_security_advisories/

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10) Verification 

Please verify this advisory by visiting the Secunia website:
http://secunia.com/secunia_research/2004-20/

Complete list of vulnerability reports published by Secunia Research:
http://secunia.com/secunia_research/

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