By exploiting an Open Redirect vulnerability on a website, an attacker could have spoofed the site displayed in the download file dialog to show the original site (the one suffering from the open redirect) rather than the site the file was actually downloaded from. This vulnerability affects Firefox < 81, Thunderbird < 78.3, and Firefox ESR < 78.3.
The web application accepts a user-controlled input that specifies a link to an external site, and uses that link in a redirect.
| Link | Tags |
|---|---|
| https://www.mozilla.org/security/advisories/mfsa2020-43/ | release notes vendor advisory |
| https://www.mozilla.org/security/advisories/mfsa2020-44/ | release notes vendor advisory |
| https://www.mozilla.org/security/advisories/mfsa2020-42/ | release notes vendor advisory |
| https://bugzilla.mozilla.org/show_bug.cgi?id=1641487 | vendor advisory issue tracking permissions required |
| https://www.debian.org/security/2020/dsa-4770 | third party advisory vendor advisory |
| https://lists.debian.org/debian-lts-announce/2020/10/msg00020.html | third party advisory mailing list |
| https://security.gentoo.org/glsa/202010-02 | third party advisory vendor advisory |
| http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00074.html | vendor advisory broken link mailing list third party advisory |
| http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00077.html | vendor advisory broken link mailing list third party advisory |