Advisory ID: HTB23234
Product: EWWW Image Optimizer WordPress plugin
Vendor: Shane Bishop
Vulnerable Version(s): 2.0.1 and probably prior
Tested Version: 2.0.1
Advisory Publication:  September 17, 2014  [without technical details]
Vendor Notification: September 17, 2014 
Vendor Patch: September 24, 2014 
Public Disclosure: October 8, 2014 
Vulnerability Type: Cross-Site Scripting [CWE-79]
CVE Reference: CVE-2014-6243
Risk Level: Low 
CVSSv2 Base Score: 2.6 (AV:N/AC:H/Au:N/C:N/I:P/A:N)
Solution Status: Fixed by Vendor
Discovered and Provided: High-Tech Bridge Security Research Lab ( https://www.htbridge.com/advisory/ ) 

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Advisory Details:

High-Tech Bridge Security Research Lab discovered vulnerability in EWWW Image Optimizer WordPress plugin, which can be exploited to perform Cross-Site Scripting (XSS) attacks against administrator of a WordPress website with vulnerable plugin.


1) Reflected Cross-Site Scripting (XSS) in EWWW Image Optimizer WordPress plugin: CVE-2014-6243

Input passed via the "page" HTTP GET parameter to "/wp-admin/options-general.php" script is not properly sanitised before being returned to the user. A remote attacker can trick a logged-in administrator to open a specially crafted link and execute arbitrary HTML and script code in browser in context of the vulnerable website.

The exploitation example below uses the "alert()" JavaScript function to display administrator's cookies:

http://wordpress/wp-admin/options-general.php?page=ewww-image-optimizer/ewww-image-optimizer.php&pngout=failed&error=%3Cscript%3Ealert%28document.cookie%29;%3C/script%3E



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Solution:

Update to EWWW Image Optimizer 2.0.2.

More Information:
https://wordpress.org/plugins/ewww-image-optimizer/changelog/

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References:

[1] High-Tech Bridge Advisory HTB23234 - https://www.htbridge.com/advisory/HTB23234 - Reflected Cross-Site Scripting (XSS) in EWWW Image Optimizer WordPress Plugin.
[2] EWWW Image Optimizer WordPress plugin - http://www.shanebishop.net/ - Reduce file sizes for images within WordPress including NextGEN Gallery and GRAND FlAGallery. Uses jpegtran, optipng/pngout, and gifsicle.
[3] Common Vulnerabilities and Exposures (CVE) - http://cve.mitre.org/ - international in scope and free for public use, CVE® is a dictionary of publicly known information security vulnerabilities and exposures.
[4] Common Weakness Enumeration (CWE) - http://cwe.mitre.org - targeted to developers and security practitioners, CWE is a formal list of software weakness types.
[5] ImmuniWeb® SaaS - https://www.htbridge.com/immuniweb/ - hybrid of manual web application penetration test and cutting-edge vulnerability scanner available online via a Software-as-a-Service (SaaS) model.

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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.