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FirefoxWeb browser · Mozilla

CVE-2013-5600

HIGH · 10.0 CVSS v2.0 Published 2013-10-30
Fix available
A fix is available. Upgrade to after 24.0.1 or later.
See remediation →
100/100
Remediation priority · Urgent
Remotely reachable No privileges Zero-click

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
Use-after-free vulnerability in the nsIOService::NewChannelFromURIWithProxyFlags function in Mozilla Firefox before 25.0, Firefox ESR 17.x before 17.0.10 and 24.x before 24.1, Thunderbird before 24.1, Thunderbird ESR 17.x before 17.0.10, and SeaMonkey before 2.22 allows remote attackers to execute arbitrary code via vectors involving a blob: URL.

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

Use-after-free vulnerability in nsIOService::NewChannelFromURIWithProxyFlags allows remote attackers to execute arbitrary code via specially crafted blob: URL vectors in Mozilla Firefox before 25.0, Firefox ESR 17.x/24.x, Thunderbird before 24.1, Thunderbird ESR 17.x, and SeaMonkey before 2.22.

MitigationDeploy vendor-supplied patches by updating all affected Mozilla products (Firefox, Firefox ESR, Thunderbird, Thunderbird ESR, SeaMonkey) to the patched versions specified in Mozilla security advisories.

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
FirefoxWeb browser
Affected:<= 24.0= 19.0= 19.0.1= 19.0.2= 20.0= 20.0.1= 21.0= 22.0= 23.0= 23.0.1= 17.0= 17.0.1
ThunderbirdApplication
Affected:<= 24.0.1= 17.0= 17.0.1= 17.0.2= 17.0.3= 17.0.4= 17.0.5= 17.0.6= 17.0.7= 17.0.8= 24.0
Thunderbird EsrApplication
Affected:= 17.0.9= 17.0= 17.0.1= 17.0.2= 17.0.3= 17.0.4= 17.0.5= 17.0.6= 17.0.7= 17.0.8
SeamonkeyApplication
Affected:<= 2.22= 2.0= 2.0.1= 2.0.2= 2.0.3= 2.0.4= 2.0.5= 2.0.6= 2.0.7= 2.0.8= 2.0.9= 2.0.10

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
Authentication
None
Confidentiality
Complete
Integrity
Complete
Availability
Complete

AV:N/AC:L/Au:N/C:C/I:C/A:C

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 the installed Mozilla product
    Check which Mozilla application is installed on the system: Firefox, Thunderbird, or SeaMonkey. On Windows, check Add/Remove Programs or the application executable properties. On Linux, check the package manager or application menu. On macOS, check /Applications folder or the app bundle info.
    Affected if Any of the affected products (Firefox, Thunderbird, Thunderbird ESR, SeaMonkey) are installed
  2. Determine the installed Firefox version
    In Firefox, navigate to Help > About Firefox, or enter 'about:support' in the address bar. The version number is displayed at the top of the page.
    Affected if The version is 24.0 or lower, or matches any of these specific versions: 19.0, 19.0.1, 19.0.2, 20.0, 20.0.1, 21.0, 22.0, 23.0, 23.0.1, 17.0, 17.0.1
  3. Determine the installed Thunderbird version
    In Thunderbird, navigate to Help > About Thunderbird. The version number is displayed in the dialog window.
    Affected if The version is 24.0.1 or lower, or matches any of these specific versions: 17.0 through 17.0.8 (including all point releases), 24.0
  4. Determine the installed SeaMonkey version
    In SeaMonkey, navigate to Help > About SeaMonkey. The version number is displayed in the dialog window.
    Affected if The version is 2.22 or lower, or matches any of these specific versions: 2.0 through 2.0.10 (including all point releases)

If any of the identified Mozilla products match the affected version ranges listed for CVE-2013-5600, the environment is potentially vulnerable to the use-after-free flaw via blob: URL vectors.

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.

dbcve · scoped
Upgrade available Upgrade to a release after 24.0.1
Interim mitigation

Deploy vendor-supplied patches by updating all affected Mozilla products (Firefox, Firefox ESR, Thunderbird, Thunderbird ESR, SeaMonkey) to the patched versions specified in Mozilla security advisories.

Recommended fix High confidence

Firefox 25.0 / Firefox ESR 17.0.10 or 24.1 / Thunderbird 24.1 / Thunderbird ESR 17.0.10 / SeaMonkey 2.22

  1. Identify which Mozilla product (Firefox, Thunderbird, Thunderbird ESR, or SeaMonkey) is installed and note its current version
  2. For Firefox users: Upgrade to Firefox 25.0 or later (or Firefox ESR 24.1+ for extended support)
  3. For Thunderbird users: Upgrade to Thunderbird 24.1 or later
  4. For Thunderbird ESR users: Upgrade to Thunderbird ESR 17.0.10 or later
  5. For SeaMonkey users: Upgrade to SeaMonkey 2.22 or later
  6. Download the appropriate updated version from the official Mozilla website (mozilla.org) or use the built-in update mechanism (Help > About > Check for Updates)
  7. Restart the application after the update is complete
  8. Verify the installed version matches or exceeds the fixed release
Caveat Upgrading may cause compatibility issues with older extensions or add-ons; test in a non-production environment first if possible

Generated from the published advisory — verify against the referenced sources before acting.

Fix this in Firefox Scoped from the published advisory
  • Consultation1.0 h
  • Implementation2.0 h
  • Testing1.0 h
  • Review / QA1.0 h
5.0 hours of engineering $890
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Scan for this in your stack

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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-2013-5600 in production — separate from our analysis above.

No notes yet

Be the first to add a field note for this CVE — a mitigation you’ve verified, a version caveat, or a link to a working fix. Sign in above to contribute.

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