high
7.5
CWE
200
Advisory Published
CVE Published
Updated

CVE-2017-7843: Infoleak

First published: Wed Nov 29 2017(Updated: )

When Private Browsing mode is used, it is possible for a web worker to write persistent data to IndexedDB and fingerprint a user uniquely. IndexedDB should not be available in Private Browsing mode and this stored data will persist across multiple private browsing mode sessions because it is not cleared when exiting.

Credit: security@mozilla.org

Affected SoftwareAffected VersionHow to fix
Mozilla Firefox<57.0.1
57.0.1
<57.0.1
57.0.1
<52.5.2
52.5.2
Debian Debian Linux=7.0
Debian Debian Linux=8.0
Debian Debian Linux=9.0
Mozilla Firefox<57.0.1
Mozilla Firefox ESR<52.5.2
Redhat Enterprise Linux Desktop=6.0
Redhat Enterprise Linux Desktop=7.0
Redhat Enterprise Linux Server=6.0
Redhat Enterprise Linux Server=7.0
Redhat Enterprise Linux Server Aus=7.4
Redhat Enterprise Linux Server Eus=7.4
Redhat Enterprise Linux Server Eus=7.5
Redhat Enterprise Linux Workstation=6.0
Redhat Enterprise Linux Workstation=7.0
debian/firefox
118.0.2-1
debian/firefox-esr
91.12.0esr-1~deb10u1
115.3.1esr-1~deb10u1
102.15.0esr-1~deb11u1
115.3.1esr-1~deb11u1
102.15.1esr-1~deb12u1
115.3.0esr-1~deb12u1
115.3.0esr-1

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Reference Links

Parent vulnerabilities

(Appears in the following advisories)

Peer vulnerabilities

(Found alongside the following vulnerabilities)

Frequently Asked Questions

  • What is CVE-2017-7843?

    CVE-2017-7843 is a vulnerability that allows a web worker to write persistent data to IndexedDB in Private Browsing mode, potentially fingerprinting a user uniquely.

  • Which software is affected by CVE-2017-7843?

    Mozilla Firefox versions up to 57.0.1, Mozilla Firefox ESR versions up to 52.5.2, and Debian versions including 118.0.2-1 and certain packages of Firefox-esr are affected by CVE-2017-7843.

  • What is the severity level of CVE-2017-7843?

    CVE-2017-7843 has a severity level of high with a severity value of 7.

  • How can I fix CVE-2017-7843?

    To fix CVE-2017-7843, update Mozilla Firefox to version 57.0.1 or later, Mozilla Firefox ESR to version 52.5.2 or later, or update the affected Debian packages to their respective patched versions.

  • Where can I find more information about CVE-2017-7843?

    You can find more information about CVE-2017-7843 on the following references: [1] [2] [3].

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