CVE-2018-12243
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 · uneditedThe Symantec Messaging Gateway product prior to 10.6.6 may be susceptible to a XML external entity (XXE) exploit, which is a type of issue where XML input containing a reference to an external entity is processed by a weakly configured XML parser. The attack uses file URI schemes or relative paths in the system identifier to access files that should not normally be accessible.
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 confidenceThis is an XML External Entity (XXE) injection vulnerability in Symantec Messaging Gateway versions prior to 10.6.6. The product's XML parser is weakly configured and processes external entity references, allowing authenticated attackers to access local files on the system using file URI schemes or relative paths.
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< 10.6.6CVSS 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
- Adjacent
- Complexity
- Low
- Privileges
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/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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Confirm Symantec Messaging Gateway is installedLocate the SMG installation directory or check for the product via system inventory tools. Common paths include /opt/Symantec/SMG or C:\Program Files\Symantec\MessagingGateway on Windows.Affected if The product is not found on the system.
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Determine installed SMG versionAccess the SMG administration console and navigate to Help > About, or run the command line utility if available (such as 'smg --version' or check version info in the installation directory).Affected if The installed version is lower than 10.6.6 (for example, 10.6.5, 10.6.4, etc.).
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Verify XML import or parsing features are accessibleCheck if the SMG administration interface includes features that accept XML input, such as configuration import, policy import, or report templates that process XML documents.Affected if XML import or parsing features are enabled and accessible to authenticated users.
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Confirm remote authentication is enabledReview the SMG authentication settings in the administration console under Users > Authentication. Determine if LDAP, RADIUS, or local user accounts can authenticate remotely.Affected if Remote authentication is enabled and allows user logins.
The environment is affected if Symantec Messaging Gateway is installed with a version lower than 10.6.6 and XML parsing features are accessible to authenticated users.
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 data10.6.6
Apply the vendor patch to upgrade to Symantec Messaging Gateway version 10.6.6 or later, which contains the corrected XML parser configuration.
- Consultation2.0 h
- Implementation4.0 h
- Testing4.0 h
- Review / QA2.0 h
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Free · runs locallyCheck whether your project pulls in CVE-2018-12243 — 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-2018-12243 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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