Analyst readout for executives and security teams
Plain-English summary
Cisco Umbrella Enterprise Roaming Client had a local privilege escalation flaw. A user already logged into the machine could place a file where the client should not allow it, causing code to run with Administrator privileges when the client executed it.
Executive priority
Treat as a managed-endpoint hardening issue. It requires local credentials, but successful exploitation can turn a standard user foothold into Administrator control on affected machines.
Technical view
The issue is caused by improper file system permission handling in Cisco Umbrella ERC. Non-administrative authenticated local users could write files into restricted directories. If the ERC client later executed the placed executable, it would run with Administrator privileges.
Likely exposure
Exposure is limited to endpoints running the affected Cisco Umbrella Enterprise Roaming Client where an attacker has valid local user credentials. The source bundle does not provide affected version ranges.
Exploitation context
The bundle references a public Exploit-DB entry, but KEV is false and no cited source states active exploitation. This is a post-authentication, local privilege escalation, not a remote unauthenticated compromise path.
Researcher notes
CVE data lists CWE-20, while the description points to improper filesystem permissions. Version and fix details are not present in the supplied bundle, so validation should anchor on Cisco's advisory and local permission checks.
Mitigation direction
- Review Cisco advisory for affected and fixed ERC versions.
- Upgrade or replace affected clients according to Cisco guidance.
- Restrict local user access on managed endpoints where possible.
- Monitor ERC directories for unexpected executable files.
- Use endpoint controls to block untrusted executable placement and launch.
Validation and detection
- Inventory endpoints running Cisco Umbrella Enterprise Roaming Client.
- Compare installed ERC versions against Cisco's advisory guidance.
- Verify non-administrators cannot write to ERC restricted directories.
- Review endpoint logs for unexpected executables in ERC directories.
- Check whether local standard users can modify client installation paths.
Public sources used
Based on public source material and reviewed before publication.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-20: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupPrivilege behavior lookup
The CVE wording references privilege impact, so privilege escalation and authorization behavior review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2018-0438 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- 20180905 Cisco Umbrella Enterprise Roaming Client Privilege Escalation VulnerabilityCVE reference · vendor-advisory, x_refsource_CISCO
- 105286CVE reference · vdb-entry, x_refsource_BID
- 45339CVE reference · exploit, x_refsource_EXPLOIT-DB
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Improper Input Validation
Improper Input Validation represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.