dbcve.org
Enterprise Linux DesktopOperating system · Redhat

CVE-2018-12366

MEDIUM · 6.5 CVSS v3.0 Published 2018-10-18
Mitigation only
No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.
See remediation →
72/100
Remediation priority · Elevated
Remotely reachable No privileges

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 · unedited
An invalid grid size during QCMS (color profile) transformations can result in the out-of-bounds read interpreted as a float value. This could leak private data into the output. This vulnerability affects Thunderbird < 60, Thunderbird < 52.9, Firefox ESR < 60.1, Firefox ESR < 52.9, and Firefox < 61.

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 confidence

An invalid grid size in the QCMS color profile transformation library causes an out-of-bounds memory read, with the retrieved data being interpreted as a float value. This can lead to leakage of uninitialized or adjacent memory contents (potentially private data) into the color transformation output.

MitigationApply vendor patches by updating Thunderbird to version 60+ (or 52.9+), Firefox to version 61+, or Firefox ESR to version 60.1+ (or 52.9+).

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
Enterprise Linux DesktopOperating system
Affected:= 6.0= 7.0
Enterprise Linux ServerOperating system
Affected:= 6.0= 7.0
Enterprise Linux Server AusOperating system
Affected:= 7.6
Enterprise Linux Server EusOperating system
Affected:= 7.5= 7.6
Enterprise Linux Server TusOperating system
Affected:= 7.6
Enterprise Linux WorkstationOperating system
Affected:= 6.0= 7.0
Debian LinuxOperating system
Affected:= 8.0= 9.0
Ubuntu LinuxOperating system
Affected:= 14.04= 16.04= 17.10= 18.04

CVSS 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
Required
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None

CVSS:3.0/AV:N/AC:L/PR:N/UI:R/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 checks

Work through these to decide whether this CVE applies to you.

  1. Identify installed browser packages
    Run 'dpkg -l | grep -E "firefox|thunderbird"' on Debian/Ubuntu systems or 'rpm -qa | grep -E "firefox|thunderbird"' on RHEL systems to list installed Firefox or Thunderbird packages and their versions
    Affected if Firefox versions below 61, Thunderbird versions below 60, or Firefox ESR versions below 60.1 (or 52.9) are installed from the distribution packages on the affected OS versions listed
  2. Check system OS version
    Run 'cat /etc/os-release' or 'cat /etc/redhat-release' to confirm the installed operating system version
    Affected if The system is running RHEL 6.0, 7.0, 7.5, or 7.6; Debian 8.0 or 9.0; or Ubuntu 14.04, 16.04, 17.10, or 18.04 with an unpatched browser
  3. Verify QCMS library presence
    Run 'find /usr -name "*qcms*" 2>/dev/null' or check within the browser directory (typically /usr/lib/firefox or /usr/lib/thunderbird) for the QCMS library file used for color profile transformations
    Affected if The QCMS library file exists and originates from an unpatched browser package on an affected distribution version

A user is affected if they are running an unpatched Firefox (below 61), Thunderbird (below 60), or Firefox ESR (below 60.1 or 52.9) package provided by RHEL 6.0/7.x, Debian 8.0/9.0, or Ubuntu 14.04/16.04/17.10/18.04 that includes the vulnerable QCMS color profile transformation code.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

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 data
Mitigation available No clean upgrade yet — mitigate in the meantime
Mitigation

Apply vendor patches by updating Thunderbird to version 60+ (or 52.9+), Firefox to version 61+, or Firefox ESR to version 60.1+ (or 52.9+).

Fix this in Enterprise Linux Desktop Scoped from the published advisory
  • Consultation1.0 h
  • Implementation2.0 h
  • Testing2.0 h
  • Review / QA1.0 h
6.0 hours of engineering $1,040
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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2018-12366 in production — separate from our analysis above.

No notes yet

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What this is

A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.

What belongs here
  • 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