65052 : TCExam /admin/code/tce_functions_tcecode_editor.php Arbitrary File Upload
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Views This Week	Views All Time	Added to OSVDB	Last Modified	Modified (since 2008)	Percent Complete
11	1435	almost 3 years ago	6 months ago	5 times	70%

Timeline

Disclosure Date
2010-06-02

Description

TCExam contains a flaw that may allow a remote attacker to execute arbitrary code. The issue is due to the 'admin/code/tce_functions_tcecode_editor.php' script allowing the upload of files with arbitrary extensions to a folder inside the webroot. This may allow an attacker to upload arbitrary files, and for example, execute arbitrary PHP code.

Classification

Location: Remote / Network Access
Attack Type: Input Manipulation
Impact: Loss of Integrity
Solution: Upgrade
Exploit: Exploit Public
Disclosure: Uncoordinated Disclosure
OSVDB: Web Related

Solution

Upgrade to version 10.1.012 or higher, as it has been reported to fix this vulnerability. An upgrade is required as there are no known workarounds.

Products

Unknown or Incomplete

References

CVE ID: 2010-2153 (see also: NVD)
Secunia Advisory ID: 40011
Bugtraq ID: 40511
VUPEN Advisory: ADV-2010-1329
Other Advisory URL: http://cross-site-scripting.blogspot.com/2010/06/tcexam-101006-arbitrary-upload.html
http://www.packetstormsecurity.org/1006-exploits/tcexam-shell.txt

Credit

Unknown or Incomplete

CVSSv2 Score

CVSSv2 Base Score = 6.8
Source: nvd.nist.gov | Generated: 2010-06-04 | Disagree?

Comments

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Anonymous - 2010/06/12 11:21:14

This vulnerability has been fixed on TCExam 10.1.011.

Now you can upload only the file types listed on K_ALLOWED_UPLOAD_EXTENSIONS constant at admin/config/tce_config.php.

Anyway, the vulnerability description is WRONG because only TCExam administrators may upload files to the system (you can upload files only from administration area - that should be password protected - and if you have an editor level). This means that only a TCExam administrator can hack himself!

Please note that I haven't received any notice about this vulnerability, I've just discovered it casually and immediately fixed. I think that you should always contact authors before publishing a security advisory.

jkouns - 2010/06/12 13:20:05

John Leitch said...
Take another look at the code I posted. No authentication is performed. This vulnerability can be exploited without logging in, and this has been verified by a 3rd party.

Note that Secunia rated this Highly Critical:

http://secunia.com/advisories/40011/

And regarding disclosure, I do this in my free time and given the number of vendors who've ignored me in the past I've decided to take an immediate, full disclosure route.

* source - http://cross-site-scripting.blogspot.com/2010/06/tcexam-101006-arbitrary-upload.html

Anonymous - 2010/06/13 04:27:35

Note that if you correctly install TCExam, you must set a webserver-level password for the entire administration area.
Anyway, I've completely fixed the authentication issue on TCExam 10.1.012.

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