[FD] Path traversal in Photo Gallery may allow admins to read most files on the filesystem (WordPress plugin)

[dxw Security <security@xxxxxxx>]

Details
================
Software: Photo Gallery
Version: 1.3.34,1.3.42
Homepage: https://wordpress.org/plugins/photo-gallery/
Advisory report: 
https://security.dxw.com/advisories/path-traversal-in-photo-gallery-may-allow-admins-to-read-most-files-on-the-filesystem/
CVE: Awaiting assignment
CVSS: 4 (Medium; AV:N/AC:L/Au:S/C:P/I:N/A:N)

Description
================
Path traversal in Photo Gallery may allow admins to read most files on the 
filesystem

Vulnerability
================
The plugin contains a file manager component which allows broad access to the 
filesystem including deleting files, uploading files, and moving files. In this 
proof-of-concept we’ll be using path traversal to copy a configuration file 
from /etc into a web-readable directory in order to allow the attacker to read 
secrets.

Proof of concept
================

Visit: http://localhost/wp-admin/admin.php?page=galleries_bwg
Click Add new then Add Images
Right-click on the file manager overlay, click Inspect, and use the dev tools 
to get the URL of this iframe
Remove &extensions=jpg%2Cjpeg%2Cpng%2Cgif from the URL
Append &dir=/../../../../../../etc/ to the URL
Visit that URL
Select the passwd file by clicking on it once
Press the copy button in the toolbar
Press the up button repeatedly until you arrive back at 
wp-content/uploads/photo-gallery
Press the paste button
Visit http://localhost/wp-content/uploads/photo-gallery/passwd to read the list 
of users

The number of ../ you need to add to the URL will vary, and the web server may 
be configured to only allow reading files with certain extensions.

Mitigations
================
Upgrade to version 1.3.43 or later.

Disclosure policy
================
dxw believes in responsible disclosure. Your attention is drawn to our 
disclosure policy: https://security.dxw.com/disclosure/

Please contact us on security@xxxxxxx to acknowledge this report if you 
received it via a third party (for example, plugins@xxxxxxxxxxxxx) as they 
generally cannot communicate with us on your behalf.

This vulnerability will be published if we do not receive a response to this 
report with 14 days.

Timeline
================

2017-03-29: Discovered
2017-05-26: Reported to support@xxxxxxxxxxxxxx
2017-05-29: Received reply saying it would be fixed in 1.3.43
2017-05-30: Version 1.3.43 was released
2017-06-16: Advisory published



Discovered by dxw:
================
Tom Adams
Please visit security.dxw.com for more information.
          


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