high
7.5
Advisory Published
CVE Published
Updated

CVE-2018-12395

First published: Tue Oct 23 2018(Updated: )

By rewriting the `Host` request headers using the `webRequest` API, a WebExtension can bypass domain restrictions through domain fronting. This would allow access to domains that share a host that are otherwise restricted. External Reference: <a href="https://www.mozilla.org/en-US/security/advisories/mfsa2018-27/#CVE-2018-12395">https://www.mozilla.org/en-US/security/advisories/mfsa2018-27/#CVE-2018-12395</a>

Credit: security@mozilla.org security@mozilla.org

Affected SoftwareAffected VersionHow to fix
Mozilla Firefox ESR<60.3
60.3
Mozilla Firefox<63
63
Mozilla Firefox<63.0
Mozilla Firefox ESR<60.3
Debian Debian Linux=8.0
Debian Debian Linux=9.0
Canonical Ubuntu Linux=14.04
Canonical Ubuntu Linux=16.04
Canonical Ubuntu Linux=18.04
Canonical Ubuntu Linux=18.10
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 Eus=7.5
Redhat Enterprise Linux Workstation=6.0
Redhat Enterprise Linux Workstation=7.0
debian/firefox
133.0.3-1
debian/firefox-esr
115.14.0esr-1~deb11u1
128.5.0esr-1~deb11u1
128.3.1esr-1~deb12u1
128.5.0esr-1~deb12u1
128.5.0esr-1
128.5.1esr-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 the vulnerability ID for this vulnerability?

    The vulnerability ID for this vulnerability is CVE-2018-12395.

  • How does this vulnerability impact Firefox ESR?

    This vulnerability affects Firefox ESR versions prior to 60.3.

  • How does this vulnerability impact Firefox?

    This vulnerability affects Firefox versions prior to 63.0.

  • How does this vulnerability impact Debian Debian Linux?

    This vulnerability affects Debian Debian Linux version 8.0 and 9.0.

  • How does this vulnerability impact Canonical Ubuntu Linux?

    This vulnerability affects Canonical Ubuntu Linux versions 14.04, 16.04, 18.04, and 18.10.

  • How does this vulnerability impact Redhat Enterprise Linux Desktop?

    This vulnerability affects Redhat Enterprise Linux Desktop versions 6.0 and 7.0.

  • How does this vulnerability impact Redhat Enterprise Linux Server?

    This vulnerability affects Redhat Enterprise Linux Server versions 6.0, 7.0, and 7.5.

  • How does this vulnerability impact Redhat Enterprise Linux Workstation?

    This vulnerability affects Redhat Enterprise Linux Workstation versions 6.0 and 7.0.

  • How can I fix this vulnerability?

    To fix this vulnerability, upgrade to Firefox ESR 60.3 or later and Firefox 63.0 or later.

  • Are there any references for this vulnerability?

    Yes, you can find references for this vulnerability at the following links: [Bugzilla](https://bugzilla.mozilla.org/show_bug.cgi?id=1467523), [Mozilla security advisories](https://www.mozilla.org/en-US/security/advisories/mfsa2018-27/), [CVE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-12395).

  • What is the severity of CVE-2018-12395?

    The severity of CVE-2018-12395 is high, with a severity value of 7.5.

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