Current Description

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.FontCoverService that allows any app co-located on the device to supply arbitrary commands via shell script to be executed as the system user that are triggered by writing an attacker-selected message to the logcat log. 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 commands as the system user can allow a third-party app to factory reset the device, 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.

Source:  MITRE
View Analysis Description

Analysis Description

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.FontCoverService that allows any app co-located on the device to supply arbitrary commands via shell script to be executed as the system user that are triggered by writing an attacker-selected message to the logcat log. 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 commands as the system user can allow a third-party app to factory reset the device, 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.

Source:  MITRE

Severity

CVSS 3.x Severity and Metrics:

CVSS 2.0 Severity and Metrics:

References to Advisories, Solutions, and Tools

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Weakness Enumeration

CWE-ID CWE Name Source
CWE-732 Incorrect Permission Assignment for Critical Resource NIST  

Known Affected Software Configurations Switch to CPE 2.2

Configuration 1 ( hide )

 cpe:2.3:o:tecno-mobile:tecno/h622/tecno-id5b:8.1.0/o11019/g-180829v31:user/release-keys_firmware:-:*:*:*:*:*:*:*
     Show Matching CPE(s)
 cpe:2.3:h:tecno-mobile:tecno/h622/tecno-id5b:8.1.0/o11019/g-180829v31:user/release-keys:-:*:*:*:*:*:*:*
     Show Matching CPE(s)

Change History

1 change record found – show changes

Initial Analysis12/2/2019 2:49:54 PM

Action Type Old Value New Value
Added CPE Configuration
AND
     OR
          *cpe:2.3:o:tecno-mobile:tecno/h622/tecno-id5b:8.1.0/o11019/g-180829v31:user/release-keys_firmware:-:*:*:*:*:*:*:*
     OR
          cpe:2.3:h:tecno-mobile:tecno/h622/tecno-id5b:8.1.0/o11019/g-180829v31:user/release-keys:-:*:*:*:*:*:*:*
Added CVSS V2
NIST (AV:L/AC:L/Au:N/C:C/I:C/A:C)
Added CVSS V3.1
NIST AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Added CWE
NIST CWE-732
Changed Reference Type
https://www.kryptowire.com/android-firmware-2019/ No Types Assigned
https://www.kryptowire.com/android-firmware-2019/ Third Party Advisory