CVE-2023-42707
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 · uneditedIn firewall service, there is a possible way to write permission usage records of an app due to a missing permission check. This could lead to local information disclosure with no additional execution privileges needed
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 · moderate confidenceA missing permission check in the firewall service allows writing permission usage records of an app, leading to local information disclosure. An attacker with local access could potentially access sensitive permission usage data without elevated privileges.
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= 11.0= 12.0CVSS 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
- None
- Availability
- None
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
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 checksWork through these to decide whether this CVE applies to you.
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Check Android versionGo to Settings > About Phone > Android version (or use 'getprop ro.build.version.release' via ADB shell)Affected if The installed Android version is exactly 11.0 or 12.0 (or within the 11.x/12.x series if the '=' notation indicates major version ranges)
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Identify firewall service componentOn Android, the firewall functionality is handled by Iptables or nftables. Check if the device has a custom firewall app or uses Android's built-in netd/iptables service. Use 'iptables -L -n' or 'nft list ruleset' via ADB shell to inspect active firewall rulesAffected if The firewall service is accessible to apps without proper permission validation (this requires code review or reverse engineering of the system service, which is not directly inspectable on production devices)
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Verify permission usage records accessCheck if apps can write permission usage records. On affected devices, any local app could potentially write to permission usage logs without the WRITE_SECURE_SETTINGS or equivalent privileged permission. Inspect /data/system/permission_usage/ or similar system directories via ADB if root access is availableAffected if Apps without elevated privileges can write to permission usage records, indicating the missing permission check is present
A user is affected if their device runs Android 11.x or 12.x and the firewall service lacks proper permission checks, allowing unprivileged apps to access permission usage data
Generated from the published advisory. Verify against your own configuration.
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 dataImplement proper permission checks in the firewall service before allowing write access to permission usage records. Ensure the service validates caller identity and permissions before processing any requests.
- Consultation2.0 h
- Implementation4.0 h
- Testing3.0 h
- Review / QA2.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $3,088.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2023-42707 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2023-42707 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
- No weaponised exploit code, or anything meant to cause harm
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