CVE-2017-7838: Input Validation

Reference Links

• https://bugzilla.mozilla.org/show_bug.cgi?id=1399540
• https://www.mozilla.org/security/advisories/mfsa2017-24/
• http://www.securityfocus.com/bid/101832
• http://www.securitytracker.com/id/1039803
• https://launchpad.net/bugs/cve/CVE-2017-7838
• https://www.mozilla.org/en-US/security/advisories/mfsa2017-24/
• https://www.mozilla.org/en-US/security/advisories/mfsa2017-24/#CVE-2017-7840
• https://www.mozilla.org/en-US/security/advisories/mfsa2017-24/#CVE-2017-7838
• https://security-tracker.debian.org/tracker/CVE-2017-7838
• https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-7838
• https://nvd.nist.gov/vuln/detail/CVE-2017-7838
• https://ubuntu.com/security/CVE-2017-7838

Parent vulnerabilities

(Appears in the following advisories)

• MFSA2017-24

Peer vulnerabilities

(Found alongside the following vulnerabilities)

• CVE-2017-7828
• CVE-2017-7830
• CVE-2017-7831
• CVE-2017-7832
• CVE-2017-7833
• CVE-2017-7834
• CVE-2017-7835
• CVE-2017-7836
• CVE-2017-7837
• CVE-2017-7838
• CVE-2017-7839
• CVE-2017-7840
• CVE-2017-7842
• CVE-2017-7827
• CVE-2017-7826

Frequently Asked Questions

• What is CVE-2017-7838?

  CVE-2017-7838 is a vulnerability where Punycode format text will be displayed for entire qualified international domain names in some instances when a sub-domain triggers the punycode display instead of the primary domain being displayed in native script and the sub-domain only displaying as punycode.

• Which software is affected by CVE-2017-7838?

  Mozilla Firefox versions up to and excluding 57.0.2, as well as Ubuntu packages firefox 57.0, 57.0+, and 57.0.1+, are affected by this vulnerability.

• What is the severity of CVE-2017-7838?

  The severity of CVE-2017-7838 is medium with a CVSS score of 5.3.

• How can I fix CVE-2017-7838?

  To fix CVE-2017-7838, update Mozilla Firefox to version 57.0.2 or later, or update the affected Ubuntu packages to the recommended versions.

• Where can I find more information about CVE-2017-7838?

  You can find more information about CVE-2017-7838 on the Mozilla Bugzilla and Mozilla Security Advisories websites, as well as on the SecurityFocus website.