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Synology DiskStation Manager (DSM) User Enumeration

Synology DiskStation Manager (DSM) User Enumeration
Posted Jan 8, 2018
Authored by Steve Kaun

Synology DiskStation Manager (DMS) versions prior to 6.1.3-15152 suffer from a forget_passwd.cgi user enumeration vulnerability.

tags | exploit, cgi
advisories | CVE-2017-9554
SHA-256 | badeff38c0b5be1a4c2359ece25657ca8c8f3d34316f5218270d5f7e18e562d5

Synology DiskStation Manager (DSM) User Enumeration

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# Exploit Title: Synology DiskStation Manager (DSM) < 6.1.3-15152 - 'forget_passwd.cgi' User Enumeration 
# Date: 01/05/2018
# Exploit Author: Steve Kaun
# Vendor Homepage: https://www.synology.com
# Version: Before 6.1.3-15152
# CVE : CVE-2017-9554

Previously this was identified by the developer and the disclosure states "via unspecified vectors" it is possible to enumerate usernames via forget_passwd.cgi

Haven't identified any other disclosures that actually identified the attack vector, figure it would be helpful to another.


"An information exposure vulnerability in forget_passwd.cgi in Synology DiskStation Manager (DSM) before 6.1.3-15152 allows remote attackers to enumerate valid usernames via unspecified vectors."

Well then... Here you go, cracked the code and figured it out.

https://IP_Address:5001/webman/forget_passwd.cgi?user=XXX

Where XXX should be your injection point for username lists.

Several usernames I've found are admin, administrator, root, nobody, ftp, and more. I'm unsure of whether Synology is pulling these entries from it's passwd file or not, but there you go.


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