CVE-2017-9554

medium

Published 2017-07-24 · Modified 2026-05-13

💬 Discuss on Community ✚ Propose mitigation

CVSS v3

5.3

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

CVSS v4 NEW

—

not yet in upstream

VIR risk

6.3

Description

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.

Predictions

Exploit likelihood

63%

Patch ETA

—

Heuristic predictions, AS-IS, for prioritization only.

Mitigations

No mitigations published for this CVE yet.

The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.

✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here with source_tier=community-verified.

Exploits

Public proof-of-concept code below. AS-IS, for defenders and authorised testing only.

Exploit-DB

EDB-43455 webapps cgi text · 1 KB

Steve Kaun · 2018-01-08

Synology DiskStation Manager (DSM) < 6.1.3-15152 - 'forget_passwd.cgi' User Enumeration

text exploit Source: Exploit-DB

# 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.

Metasploit modules

auxiliary_scanner/http/synology_forget_passwd_user_enum rank 300

Synology Forget Password User Enumeration Scanner

Source fetch failed: fetch_error — view the original via the link above.

References

CWEs

CWE-200

Community-verified mitigations for this CVE will appear above when contributors publish them.

Verify integrity in audit chain (admin only). AS-IS.