Seagate Media Server stored Cross-Site Scripting vulnerability

[Summer of Pwnage via Fulldisclosure <fulldisclosure () seclists org>]

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Seagate Media Server stored Cross-Site Scripting vulnerability
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Yorick Koster, September 2017

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Abstract
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Seagate Personal Cloud is a consumer-grade Network-Attached Storage
device (NAS). By default Seagate Media Server allows unauthenticated
users to upload files to a public share. Once a file is uploaded it can
also be downloaded again from the NAS.

No restrictions are enforced on which file types a user can upload, any
type of file can be uploaded including executable files & HTML files.
File downloads are directly handled by Lighttpd and because of this file
are processed based on its (MIME) type. An attacker can upload an HTML
file and cause Lighttpd to treat the file as a regular web page.
Consequently, uploading an HTML file can be used to execute a stored
Cross-Site Scripting attack.

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Tested versions
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This issue was tested on a Seagate Personal Cloud model SRN21C running
firmware versions 4.3.16.0 and 4.3.18.0. It is likely that other
devices/models are also affected.

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Fix
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This vulnerability has been fixed in firmware version 4.3.18.4.

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Details
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https://sumofpwn.nl/advisory/2017/seagate-media-server-stored-cross-site-scripting-vulnerability.html

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