CVE-2023-31437
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 · uneditedAn issue was discovered in systemd 253. An attacker can modify a sealed log file such that, in some views, not all existing and sealed log messages are displayed. NOTE: the vendor reportedly sent "a reply denying that any of the finding was a security vulnerability."
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 · low confidenceIn systemd 253, an attacker with the ability to modify a sealed journal log file can cause certain existing and sealed log messages to be hidden from display in some log viewing contexts. This undermines the integrity of cryptographically sealed logs, potentially allowing evidence of compromise or malicious activity to be obscured.
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= 253CVSS 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
- Network
- Complexity
- Low
- Privileges
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- None
- Integrity
- Low
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/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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Determine installed systemd versionRun `systemctl --version` or check your package manager for the systemd package version (e.g., `rpm -q systemd` or `dpkg -l systemd`).Affected if The version shown is exactly 253.
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Identify journal storage locationCheck `/var/log/journal/` directory exists and contains journal files. Also check `/run/log/journal/` for transient logs.Affected if Journal files exist in these locations.
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Verify if journal sealing is enabledInspect journald.conf or run `journalctl --list-boots` and check if seal=yes is set in journal configuration files under /etc/systemd/.Affected if Journal sealing ( seal=yes ) is configured and active.
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Check file permissions on journal directoriesRun `ls -la /var/log/journal/` and `ls -la /run/log/journal/` to inspect group and other permissions on journal directories and files.Affected if non-root users or untrusted accounts have write access to journal directories or files.
You are affected if you run systemd version 253 with journal sealing enabled and an attacker can write to sealed journal files.
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 dataEvaluate the risk in your environment - if attackers could already modify log files, this worsens the impact. Consider additional log integrity monitoring, exporting logs to remote secure destinations, and reviewing access controls to journal files.
- Consultation2.0 h
- Implementation1.0 h
- Testing2.0 h
- Review / QA1.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $1,696.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2023-31437 — 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-2023-31437 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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