Ubuntu LinuxOperating system · Canonical
CVE-2020-3123
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 · uneditedA vulnerability in the Data-Loss-Prevention (DLP) module in Clam AntiVirus (ClamAV) Software versions 0.102.1 and 0.102.0 could allow an unauthenticated, remote attacker to cause a denial of service condition on an affected device. The vulnerability is due to an out-of-bounds read affecting users that have enabled the optional DLP feature. An attacker could exploit this vulnerability by sending a crafted email file to an affected device. An exploit could allow the attacker to cause the ClamAV scanning process crash, resulting in a denial of service condition.
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 · high confidenceClamAV versions 0.102.0 and 0.102.1 contain an out-of-bounds read vulnerability in the optional Data-Loss-Prevention (DLP) module. An unauthenticated remote attacker can exploit this by sending a crafted email file to a device with DLP enabled, causing the ClamAV scanning process to crash and resulting in denial of service.
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
Ubuntu LinuxOperating system
= 12.04= 14.04= 16.04= 18.04= 19.10= 0.102.0= 0.102.1CVSS 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
- None
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
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 installed ClamAV versionRun `clamd --version` or `clamscan --version` to determine the exact version numberAffected if Version is 0.102.0 or 0.102.1
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Identify the operating systemRun `lsb_release -a` or check `/etc/os-release` to determine the Ubuntu versionAffected if Ubuntu version is 12.04, 14.04, 16.04, 18.04, or 19.10 and ClamAV 0.102.0/0.102.1 is installed
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Locate ClamAV configuration filesCheck for configuration files in /etc/clamav/ such as clamd.conf, or run `clamconf -n` to show active configurationAffected if Configuration files exist showing DLP module settings
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Determine if DLP module is enabledSearch for DLP-related directives in clamd.conf such as `LibClamAV DLP` or look for DLP signature files being loaded. Run `clamscan --debug 2>&1 | grep -i dlp` to see if DLP initializesAffected if DLP module is loaded or enabled in the ClamAV configuration
You are affected if running ClamAV version 0.102.0 or 0.102.1 on Ubuntu 12.04 through 19.10 with the optional DLP module enabled
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 dataDisable the optional DLP feature if not required, or upgrade to a patched ClamAV version beyond 0.102.1. Monitor for unexpected ClamAV process crashes indicating exploitation attempts.
Fix this in Ubuntu Linux
Scoped from the published advisory
- Consultation2.0 h
- Implementation3.0 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 $2,272.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2020-3123 — 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-2020-3123 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
- No spam, self-promotion, credentials, or personal data