Security readout for executives and security teams
Plain-English summary
CVE-2018-9411 is an Android ClearKey CAS decryption flaw that may let a remote attacker run code after user interaction. The issue is an out-of-bounds write caused by a missing bounds check. Business risk is highest for unmanaged or unsupported Android 8, 8.1, and 9 devices.
Executive priority
Treat this as a high-priority legacy Android exposure issue. The main business decision is whether affected devices can be patched, upgraded, isolated, or retired. Urgency increases where old Android devices access corporate data, privileged apps, or regulated environments.
Technical view
The vulnerability is in decrypt in ClearKeyCasPlugin.cpp. A missing bounds check can cause an out-of-bounds write, classified as CWE-787. The CVSS 3.1 score is 8.8 with network attack vector, low complexity, no privileges, required user interaction, and high confidentiality, integrity, and availability impact.
Likely exposure
Exposure is limited to Android 8, 8.1, and 9 as listed in the source bundle. Organizations should focus on older Android fleets, BYOD devices, kiosks, media devices, and any assets that may still run unsupported or vendor-delayed Android builds.
Exploitation context
The sources describe potential remote arbitrary code execution with no extra privileges, but user interaction is required. The bundle does not show CISA KEV listing or other evidence of active exploitation, so active exploitation should not be assumed.
Researcher notes
Evidence is sufficient for affected versions, weakness class, impact, and CVSS. The provided bundle does not include exploit availability, detailed patch identifiers, or proof-of-concept status. Avoid assuming exploitation in the wild without additional cited evidence.
Mitigation direction
- Identify Android 8, 8.1, and 9 devices in managed and BYOD inventories.
- Check Google and OEM guidance for updates covering CVE-2018-9411.
- Prioritize upgrades or retirement for devices no longer receiving Android security updates.
- Restrict unsupported Android devices from sensitive corporate applications and networks.
- Use mobile device management controls to enforce minimum patch levels where available.
Validation and detection
- Confirm device Android version and security patch level from MDM or device inventory.
- Map affected devices against Android 8, 8.1, and 9 exposure.
- Verify whether OEM firmware includes the relevant Android security bulletin fixes.
- Review unsupported devices for compensating controls or removal from production use.
- Track remediation completion separately for managed and BYOD populations.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
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-787: 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 lookupExecution behavior lookup
The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2018-9411 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
- High
- CVSS
- 8.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
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 vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H2.85.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
8.8HighVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://source.android.com/security/bulletin/2018-07-01CVE reference
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.
Out-of-bounds Write
Out-of-bounds Write represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.