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Tecno\/h622\/tecno Id5b\Operating system · Tecno Mobile

CVE-2019-15350

HIGH · 7.8 CVSS v3.1 Published 2019-11-14
Mitigation only
No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.
See remediation →
80/100
Remediation priority · High
Zero-click

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
The Tecno Camon Android device with a build fingerprint of TECNO/H622/TECNO-ID5b:8.1.0/O11019/G-180829V31:user/release-keys contains a pre-installed platform app with a package name of com.lovelyfont.defcontainer (versionCode=7, versionName=7.0.11). This app contains an exported service named com.lovelyfont.manager.service.FunctionService that allows any app co-located on the device to supply the file path to a Dalvik Executable (DEX) file which it will dynamically load within its own process and execute in with its own system privileges. This app cannot be disabled by the user and the attack can be performed by a zero-permission app. Executing commands as the system user can allow a third-party app to video record the user's screen, factory reset the device, obtain the user's notifications, read the logcat logs, inject events in the Graphical User Interface (GUI), and obtains the user's text messages, and more. Executing code as the system user can allow a third-party app to factory reset the device, obtain the user's Wi-Fi passwords, obtain the user's notifications, read the logcat logs, inject events in the GUI, change the default Input Method Editor (IME) (e.g., keyboard) with one contained within the attacking app that contains keylogging functionality, and obtains the user's text messages, and more.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis · high confidence

A pre-installed system app (com.lovelyfont.defcontainer) on Tecno Camon Android devices contains an exported service (FunctionService) that dynamically loads and executes arbitrary Dalvik Executable (DEX) files supplied by any local application, running with elevated system privileges. This zero-permission vulnerability allows complete device compromise.

MitigationUsers cannot directly remediate this issue as the vulnerable app is pre-installed and cannot be disabled. Mitigation requires manufacturer-provided firmware updates to remove or properly secure the exported service component.

Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.

Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.

NVD · CPE data
Tecno\/h622\/tecno Id5b\Operating system
Affected:= 8.1.0\/o11019\/g-180829v31\

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Local
Complexity
Low
Privileges
Low
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.

dbcve checks

Work through these to decide whether this CVE applies to you.

  1. Identify device model and build
    Run 'getprop ro.product.model' and 'getprop ro.build.display.id' to get the device model and build identifier
    Affected if The model is Tecno Camon (h622) and build ID contains 'o11019' or 'g-180829v31' matching the affected range
  2. Check Android OS version
    Run 'getprop ro.build.version.release' to get the Android version
    Affected if Version is 8.1.0 (Oreo) matching the affected Android version
  3. Verify vulnerable app exists
    Run 'pm list packages | grep lovelyfont' or 'pm list packages com.lovelyfont.defcontainer' to check if the package is installed
    Affected if The package com.lovelyfont.defcontainer exists on the device
  4. Confirm exported service component
    Use 'dumpsys package com.lovelyfont.defcontainer' to inspect the package components and check if FunctionService has android:exported="true" in the manifest
    Affected if FunctionService is exported and accessible to other apps without authentication

Device is affected if it is a Tecno Camon running Android 8.1.0 with build ID o11019/g-180829v31 and the com.lovelyfont.defcontainer package with exported FunctionService is present.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

From vendor data
Mitigation available No clean upgrade yet — mitigate in the meantime
Mitigation

Users cannot directly remediate this issue as the vulnerable app is pre-installed and cannot be disabled. Mitigation requires manufacturer-provided firmware updates to remove or properly secure the exported service component.

Fix this in Tecno\/h622\/tecno Id5b\ Scoped from the published advisory
  • Consultation8.0 h
  • Implementation2.0 h
  • Testing4.0 h
  • Review / QA2.0 h
16.0 hours of engineering $2,920
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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2019-15350 in production — separate from our analysis above.

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What this is

A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.

What belongs here
  • Verified mitigations, workarounds, and config changes
  • Version or environment caveats, and links to real fixes
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