CVE-2025-57838

Executive Summary

CVE-2025-57838 is an information leak vulnerability affecting certain Honor products. Successful exploitation could compromise service confidentiality by exposing sensitive data. The vulnerability has a CVSS score of 4.0 (Medium) and currently has no known public proof-of-concept, exploit code, or patch. The EPSS score is 0.0%, indicating low exploitation likelihood in the wild, but the lack of a patch makes it a latent risk for Honor device users.

CVSS Breakdown & Threat Level

• CVSS Score: 4.0 (Medium)
• Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
• Attack Vector: Local (AV:L) – requires physical or local access to the device.
• Attack Complexity: Low (AC:L) – no special conditions required.
• Privileges Required: None (PR:N) – no authentication needed.
• User Interaction: None (UI:N) – no user action required.
• Scope: Unchanged (S:U) – impact confined to the vulnerable component.
• Confidentiality Impact: Low (C:L) – limited information disclosure.
• Integrity Impact: None (I:N)
• Availability Impact: None (A:N)

Threat Level: Medium. The vulnerability is local and requires physical or local network access, but the lack of a patch and the potential for sensitive data exposure (e.g., device identifiers, configuration details) warrants attention.

Deep Dive & Mechanics

The vulnerability stems from improper access control or data exposure in Honor device firmware or system services. An attacker with local access (e.g., via a malicious app or USB debugging) can exploit this flaw to read sensitive information that should be protected. The exact mechanism is not publicly documented, but typical information leaks in embedded devices involve:

• Unprotected debug interfaces (e.g., ADB, serial console)
• World-readable configuration files containing credentials or tokens
• Log files exposing user activity or system internals
• Memory dumps accessible without proper permissions

Given the vendor is Honor (a smartphone/device manufacturer), the vulnerability likely affects Android-based devices or IoT products. The lack of a patch suggests the vendor is still investigating or has not yet released a fix.

Vulnerable vs. Patched Code

No specific code comparison is available because no patch has been released. The vulnerable code is presumed to be in system services or firmware components that expose data without proper authorization. A patched version would enforce stricter access controls, such as:

• Restricting read permissions on sensitive files
• Implementing proper authentication for debug interfaces
• Sanitizing log outputs to remove sensitive data

Exploitation & Lab Setup

Red Team (Exploitation)

Since no public exploit exists, a red team would need to reverse-engineer Honor firmware to identify the vulnerable component. A typical lab setup:

1. Hardware: Honor device (e.g., smartphone, tablet) with vulnerable firmware.
2. Software: ADB (Android Debug Bridge), firmware extraction tools (e.g., ext4_utils, binwalk), and a custom script to probe for information leaks.
3. Steps:
   • Enable USB debugging on the device.
   • Connect via ADB and explore world-readable directories (/data/local/tmp, /cache, /proc).
   • Look for configuration files, logs, or memory dumps containing sensitive data.
   • Use find / -perm -o+r -type f 2>/dev/null to locate readable files.
   • If a specific service is identified, craft a local exploit to read its memory or files.

Example command to probe for leaks:

adb shell "find / -type f -perm -o+r 2>/dev/null | xargs grep -l 'password\|token\|secret' 2>/dev/null"

Blue Team (Defense)

Blue team actions focus on detection and mitigation:

1. Monitor for unauthorized local access: Use MDM (Mobile Device Management) to enforce device encryption and disable USB debugging for non-admin users.
2. Audit file permissions: Regularly scan for world-readable sensitive files using custom scripts or security apps.
3. Network segmentation: Isolate Honor devices on a separate VLAN to limit lateral movement.
4. User awareness: Educate users not to install untrusted apps or connect devices to unknown computers.

Indicators of Compromise (IOCs)

• File paths: /data/local/tmp/*.conf, /cache/*.log, /proc/*/maps (if accessed by unauthorized processes)
• Process names: adbd, logd, or custom services reading sensitive files
• Network connections: Unusual outbound connections from the device to external IPs (if data exfiltration occurs)
• Log entries: Repeated access to protected files or directories in logcat or kernel logs

Example IOC log entry:

I/logd    : read /data/system/packages.xml by uid 1000

Detection Engineering

YARA Rule

rule Honor_InfoLeak_CVE_2025_57838 {
    meta:
        description = "Detects potential information leak indicators on Honor devices"
        author = "Valters IT"
        date = "2025-04-10"
        reference = "CVE-2025-57838"
    strings:
        $s1 = "password" nocase
        $s2 = "token" nocase
        $s3 = "secret" nocase
        $s4 = "private_key" nocase
        $s5 = "config" nocase
    condition:
        (uint16(0) == 0x4D5A or uint32(0) == 0x464C457F) and
        any of ($s*)
}

Sigma Rule

title: Honor Information Leak Detection
id: 7a8b9c0d-1e2f-3a4b-5c6d-7e8f9a0b1c2d
status: experimental
description: Detects attempts to read sensitive files on Honor devices
author: Valters IT
date: 2025-04-10
references:
    - https://nvd.nist.gov/vuln/detail/CVE-2025-57838
logsource:
    product: android
    service: logcat
detection:
    selection:
        EventID: 1000
        Message|contains:
            - "read /data/system/"
            - "read /data/local/tmp/"
            - "read /cache/"
    condition: selection
falsepositives:
    - Legitimate system processes
level: medium

Suricata Rule

alert tcp $HOME_NET any -> $EXTERNAL_NET any (msg:"CVE-2025-57838 Honor Information Leak - Potential Data Exfiltration"; flow:to_server; content:"|48 6f 6e 6f 72|"; nocase; content:"|70 61 73 73 77 6f 72 64|"; nocase; distance:0; within:100; classtype:attempted-recon; sid:1000001; rev:1;)

Remediation & Mitigation

• Immediate: Disable USB debugging and ADB access on production devices. Restrict physical access to Honor devices.
• Short-term: Monitor vendor advisories for a patch. Apply workarounds such as file permission hardening via custom scripts or MDM policies.
• Long-term: Replace vulnerable devices with patched firmware once available. Implement least-privilege access controls on all device services.

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