The 'Copy as cURL' feature of Devtools' network tab did not properly escape the HTTP POST data of a request, which can be controlled by the website. If a user used the 'Copy as cURL' feature and pasted the command into a terminal, it could have resulted in the disclosure of local files. This vulnerability affects Firefox ESR < 68.8, Firefox < 76, and Thunderbird < 68.8.0.

References

• https://nvd.nist.gov/vuln/detail/CVE-2020-12392
• https://bugzilla.mozilla.org/show_bug.cgi?id=1614468
• https://security.gentoo.org/glsa/202005-03
• https://security.gentoo.org/glsa/202005-04
• https://usn.ubuntu.com/4373-1/
• https://www.mozilla.org/security/advisories/mfsa2020-16/
• https://www.mozilla.org/security/advisories/mfsa2020-17/
• https://www.mozilla.org/security/advisories/mfsa2020-18/