Vulnerabilities > CVE-2018-0438 - Improper Privilege Management vulnerability in Cisco Umbrella Enterprise Roaming Client

047910
CVSS 7.2 - HIGH
Attack vector
LOCAL
Attack complexity
LOW
Privileges required
NONE
Confidentiality impact
COMPLETE
Integrity impact
COMPLETE
Availability impact
COMPLETE
local
low complexity
cisco
microsoft
CWE-269
exploit available

Summary

A vulnerability in the Cisco Umbrella Enterprise Roaming Client (ERC) could allow an authenticated, local attacker to elevate privileges to Administrator. To exploit the vulnerability, the attacker must authenticate with valid local user credentials. This vulnerability is due to improper implementation of file system permissions, which could allow non-administrative users to place files within restricted directories. An attacker could exploit this vulnerability by placing an executable file within the restricted directory, which when executed by the ERC client, would run with Administrator privileges.

Common Weakness Enumeration (CWE)

Common Attack Pattern Enumeration and Classification (CAPEC)

  • Restful Privilege Elevation
    Rest uses standard HTTP (Get, Put, Delete) style permissions methods, but these are not necessarily correlated generally with back end programs. Strict interpretation of HTTP get methods means that these HTTP Get services should not be used to delete information on the server, but there is no access control mechanism to back up this logic. This means that unless the services are properly ACL'd and the application's service implementation are following these guidelines then an HTTP request can easily execute a delete or update on the server side. The attacker identifies a HTTP Get URL such as http://victimsite/updateOrder, which calls out to a program to update orders on a database or other resource. The URL is not idempotent so the request can be submitted multiple times by the attacker, additionally, the attacker may be able to exploit the URL published as a Get method that actually performs updates (instead of merely retrieving data). This may result in malicious or inadvertent altering of data on the server.

Exploit-Db

descriptionCisco Umbrella Roaming Client 2.0.168 - Local Privilege Escalation. CVE-2018-0437,CVE-2018-0438. Local exploit for Windows_x86-64 platform. Tags: Local
fileexploits/windows_x86-64/local/45339.c
idEDB-ID:45339
last seen2018-10-07
modified2018-09-06
platformwindows_x86-64
port
published2018-09-06
reporterExploit-DB
sourcehttps://www.exploit-db.com/download/45339/
titleCisco Umbrella Roaming Client 2.0.168 - Local Privilege Escalation
typelocal

Packetstorm

data sourcehttps://packetstormsecurity.com/files/download/149253/ciscourc20168-escalate.txt
idPACKETSTORM:149253
last seen2018-09-06
published2018-09-06
reporterParagonSec
sourcehttps://packetstormsecurity.com/files/149253/Cisco-Umbrella-Roaming-Client-2.0.168-Privilege-Escalation.html
titleCisco Umbrella Roaming Client 2.0.168 Privilege Escalation