high
7.8
CWE
20
Advisory Published
CVE Published
Updated

CVE-2017-7814: Input Validation

First published: Thu Sep 28 2017(Updated: )

File downloads encoded with "blob:" and "data:" URL elements bypassed normal file download checks though the Phishing and Malware Protection feature and its block lists of suspicious sites and files. This would allow malicious sites to lure users into downloading executables that would otherwise be detected as suspicious. This vulnerability affects Firefox < 56, Firefox ESR < 52.4, and Thunderbird < 52.4.

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

Affected SoftwareAffected VersionHow to fix
Mozilla Firefox ESR<52.4
52.4
Mozilla Thunderbird<52.4
52.4
Mozilla Firefox<56
56
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
Mozilla Firefox<56.0
Mozilla Firefox ESR<52.4.0
Mozilla Thunderbird<52.4.0
Debian Debian Linux=7.0
Debian Debian Linux=8.0
Debian Debian Linux=9.0
debian/firefox
131.0.2-2
debian/firefox-esr
115.14.0esr-1~deb11u1
128.3.1esr-1~deb11u1
115.14.0esr-1~deb12u1
128.3.1esr-1~deb12u1
128.3.0esr-2
128.3.1esr-2
debian/thunderbird
1:115.12.0-1~deb11u1
1:115.16.0esr-1~deb11u1
1:115.12.0-1~deb12u1
1:115.16.0esr-1~deb12u1
1:128.2.0esr-1
1:128.3.0esr-1

Remedy

https://bugzilla.mozilla.org/show_bug.cgi?id=1376036

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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-2017-7814?

    CVE-2017-7814 is a vulnerability that allows file downloads encoded with "blob:" and "data:" URL elements to bypass normal file download checks.

  • What is the severity of CVE-2017-7814?

    The severity of CVE-2017-7814 is high (7.8).

  • Which software versions are affected by CVE-2017-7814?

    Ubuntu Firefox versions up to and including 56.0, Firefox ESR versions up to and including 52.4.0, Thunderbird versions up to and including 52.4.0, and various Redhat and Debian Linux versions are affected by CVE-2017-7814.

  • How can I mitigate CVE-2017-7814?

    To mitigate CVE-2017-7814, update your Firefox, Thunderbird, or Linux software to the recommended versions.

  • Where can I find more information about CVE-2017-7814?

    You can find more information about CVE-2017-7814 on Bugzilla, Mozilla's security advisories page, and SecurityFocus.

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