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Secunia Advisory SA39556

phpThumb() "fltr[]" Command Injection Vulnerability

Secunia Advisory

SA39556

Get alerted and manage the vulnerability life cycle

Release Date

2010-04-21

Last Update

2011-12-07

Popularity

7,396 views

Comments

2 comments

Criticality level

Highly critical

Impact

System access

Where

From remote

Authentication level

Available in Customer Area

Report reliability

Available in Customer Area

Solution Status

Vendor Workaround

Systems affected

Available in Customer Area

Approve distribution

Available in Customer Area

Software:

phpThumb() 1.x

Secunia CVSS Score

Available in Customer Area

CVE Reference(s)

CVE-2010-1598 CVSS available in Customer Area

Description

A vulnerability has been discovered in phpThumb(), which can be exploited by malicious people to compromise a vulnerable system.

Input passed via the "fltr[]" parameter to phpThumb.php is not properly sanitised before being used in a command line argument. This can be exploited to inject and execute arbitrary shell commands via specially crafted requests.

Successful exploitation requires that "ImageMagick" is installed.

The vulnerability is confirmed in version 1.7.9. Other versions may also be affected.

NOTE: This vulnerability can be exploited with "high_security_enabled" set to "true" by brute forcing the "high_security_password".

Solution
The vulnerability is fixed in version 1.7.10 beta.

Provided and/or discovered by
Reported as an 0-day.

Changelog
Further details available in Customer Area

Original Advisory
http://phpthumb.sourceforge.net/demo/docs/phpthumb.changelog.txt

Deep Links
Links available in Customer Area

Do you have additional information related to this advisory?

Please provide information about patches, mitigating factors, new versions, exploits, faulty patches, links, and other relevant data by posting comments to this Advisory. You can also send this information to vuln@secunia.com

Subject: phpThumb() "fltr[]" Command Injection Vulnerability

User

Message

pulsorock

RE: phpThumb() "fltr[]" Command Injection Vulnerability

21st Dec, 2010 14:57

Score: 0
Posts: 1
User Since: 21st Dec 2010
System Score: N/A
Location: PR
Last edited on 21st Dec, 2010 15:02

Here you can find a solution:

You can fix this by editing a single file: phpThumb/phpthumb.functions.php (around line 443). You just need to add a couple filtering commands to the SafeExec function to filter its input before it sends it to the command line. Right after the function declaration, add lines that filter the $command input. I haven't tested this against all possible valid phpThumb input arguments, but this does prevent a "contained" hack.

function SafeExec($command) {

// Strip off any commands after the first semi-colon
// and prepare the data to be sent to the command line.
// EVERETT @ www.fireproofsocks.com 9/26/2010
$command = preg_replace('/;.*$/','',$command); // <-- *NIX only
$command = escapeshellcmd($command);

Link: http://modxcms.com/forums/index.php/topic,54874.ms...

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pkmtrkd

RE: phpThumb() "fltr[]" Command Injection Vulnerability

23rd Dec, 2011 04:25

Score: 1
Posts: 1
User Since: 23rd Dec 2011
System Score: N/A
Location: US
Last edited on 23rd Dec, 2011 04:25

This is a fairly old thread, but please be aware that there was an uptick just today in the amount of scan activity trying to exploit this vulnerability. If anyone is still running vulnerable versions of phpthumb, you need to upgrade immediately.

Details of the activity seen today are at this link: http://foxtrot7security.blogspot.com/2011/12/new-a...

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Secunia

Secunia Advisory SA39556

phpThumb() "fltr[]" Command Injection Vulnerability

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