CVE-2025-31710 Overview
CVE-2025-31710 is a command injection vulnerability in the engineermode service shipped on Android devices powered by Unisoc chipsets. The flaw stems from improper input validation in a privileged service, allowing a local attacker to inject arbitrary shell commands. Successful exploitation grants local privilege escalation without requiring additional execution privileges or user interaction. The issue affects Android 13, 14, and 15 builds running on a broad range of Unisoc SoCs, including the S8000, SC9863A, and the T-series chipsets used in budget and mid-range smartphones, tablets, and feature phones worldwide.
Critical Impact
A local application without special permissions can execute commands in the context of the engineermode service, achieving privilege escalation on affected Android devices.
Affected Products
- Google Android 13, 14, and 15 running on Unisoc chipsets
- Unisoc S8000 and SC9863A platforms
- Unisoc Tiger series: T606, T612, T616, T750, T760, T765, T770, T820, T8300, and T9300
Discovery Timeline
- 2025-06-03 - CVE-2025-31710 published to the National Vulnerability Database
- 2025-06-10 - Last updated in NVD database
Technical Details for CVE-2025-31710
Vulnerability Analysis
The engineermode service is a privileged Android system component on Unisoc devices used for hardware diagnostics, factory testing, and low-level configuration. It typically runs with elevated privileges and exposes interfaces accessible to local applications or ADB sessions. The vulnerability is classified under [CWE-77] Improper Neutralization of Special Elements used in a Command. The service constructs and executes shell commands using attacker-controllable input without sanitizing metacharacters such as ;, &&, |, or backticks. This allows an attacker-supplied string to break out of the intended command and append additional payloads executed by the underlying shell.
Root Cause
The root cause is missing input validation on parameters passed to a system command construction routine inside engineermode. Developer-oriented diagnostic services frequently shell out to native binaries for tasks such as reading sensor data, toggling radios, or writing partitions. When user-controlled fields flow into these command strings without escaping or allowlisting, injected operators are interpreted by the shell. The result is arbitrary command execution under the service's privilege level.
Attack Vector
The attack requires local access to the device, such as an installed application or an ADB shell. An attacker crafts a request to the exposed engineermode interface containing shell metacharacters and a chained payload. Because the service runs at a higher privilege than a typical third-party application, the injected commands execute with elevated rights. No user interaction is required, and the attack complexity is low. This pattern is commonly leveraged by malicious applications seeking to escape the Android sandbox or by attackers with brief physical access to a device.
No public proof-of-concept or exploit code has been published for CVE-2025-31710, and the issue is not listed in the CISA Known Exploited Vulnerabilities catalog. The EPSS probability is 0.406%.
Detection Methods for CVE-2025-31710
Indicators of Compromise
- Unexpected child processes spawned by the engineermode service or its helper binaries on Unisoc-based Android devices.
- Shell metacharacters (;, &&, |, `, $() observed in parameters passed to engineering or diagnostic IPC endpoints.
- New or modified files in system-writable paths shortly after interaction with diagnostic interfaces.
Detection Strategies
- Audit installed applications that request access to engineering, factory, or diagnostic intents on Unisoc devices.
- Monitor mobile telemetry for processes invoking /system/bin/sh as a descendant of vendor diagnostic services.
- Correlate privilege escalation indicators with installation events for unvetted or sideloaded APKs.
Monitoring Recommendations
- Enroll affected devices into a mobile threat defense or EDR solution capable of inspecting process lineage on Android.
- Track vendor firmware patch level (ro.build.version.security_patch) across the fleet to identify unpatched devices.
- Review Unisoc security bulletins for build identifiers and map them to deployed device inventories.
How to Mitigate CVE-2025-31710
Immediate Actions Required
- Apply the firmware update referenced in the Unisoc Security Announcement as soon as device OEMs publish builds incorporating the fix.
- Inventory mobile devices running Unisoc chipsets and prioritize patching for those holding sensitive corporate data.
- Restrict installation of applications from untrusted sources on managed Android devices through MDM policy.
Patch Information
Unisoc has issued a security advisory addressing the command injection in the engineermode service. Device manufacturers integrate the fix into their monthly Android security patch level. Confirm that devices report a security patch level dated on or after the Unisoc advisory and that the OEM bulletin lists CVE-2025-31710 among resolved issues.
Workarounds
- Disable or remove diagnostic and engineering applications that expose engineermode interfaces where vendor configuration allows.
- Enforce MDM controls that block ADB over USB and Wi-Fi on production devices to reduce local attack surface.
- Require attestation or SafetyNet/Play Integrity checks before granting access to sensitive enterprise applications on unpatched devices.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
