Secunia Research: Tagger LE PHP "eval()" Injection Vulnerabilities

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                     Secunia Research 14/09/2006

        - Tagger LE PHP "eval()" Injection Vulnerabilities -

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Table of Contents

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

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1) Affected Software

Tagger LE latest version (product has no version information).

Other versions may also be affected.

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2) Severity

Rating: Highly critical
Impact: System Access
Where:  From Remote

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3) Vendor's Description of Software

Tagger LE is a tagboard (mini message board) that will add visitor 
interactivity with your website and a form of communication to one 
and another. Tagger's many features include an Administration panel, 
IP Banning, Smart Auto Refresh, Smilies, Imposter prevention, and 
more. A perfect addition to a website lacking interactivity. This 
solution uses a Flat File Database (MySQL is not required).

Product link:
http://www.venturenine.com/

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4) Description of Vulnerabilities

Secunia Research has discovered some vulnerabilities in Tagger LE, 
which can be exploited by malicious people to compromise a vulnerable 
system.

Input passed via the query string in tags.php, sign.php, and 
admin/index.php isn't properly sanitised before being used in an 
"eval()" call. This can be exploited to inject and execute arbitrary 
PHP code via a specially crafted parameter name or value.

Examples:
http://[host]/tags.php?foo=%22.[code].%22
http://[host]/sign.php?foo=%22.[code].%22
http://[host]/admin/index.php?foo=%22.[code].%22
http://[host]/taggerLE/tags.php?foo;[code];$foo=foo
http://[host]/taggerLE/sign.php?foo;[code];$foo=foo
http://[host]/admin/index.php?foo;[code];$foo=foo

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5) Solution

Edit the source code to ensure that input is properly sanitised.

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6) Time Table

30/08/2006 - Initial vendor notification.
13/09/2006 - Final reminder.
14/09/2006 - Public disclosure.

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7) Credits

Discovered by Andreas Sandblad, Secunia Research.

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8) References

The Common Vulnerabilities and Exposures (CVE) project has assigned 
CVE-2006-4437 for the vulnerabilities.

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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/2006-62/advisory/

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

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