| Name | CVE-2021-23984 |
| Description | A malicious extension could have opened a popup window lacking an address bar. The title of the popup lacking an address bar should not be fully controllable, but in this situation was. This could have been used to spoof a website and attempt to trick the user into providing credentials. This vulnerability affects Firefox ESR < 78.9, Firefox < 87, and Thunderbird < 78.9. |
| Source | CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
| References | DLA-2607-1, DLA-2609-1, DSA-4874-1, DSA-4876-1 |
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|---|---|---|
| firefox (PTS) | sid | 133.0.3-1 | fixed |
| firefox-esr (PTS) | bullseye | 115.14.0esr-1~deb11u1 | fixed |
| bullseye (security) | 128.5.0esr-1~deb11u1 | fixed | |
| bookworm | 128.3.1esr-1~deb12u1 | fixed | |
| bookworm (security) | 128.5.0esr-1~deb12u1 | fixed | |
| trixie | 128.5.0esr-1 | fixed | |
| sid | 128.5.1esr-1 | fixed | |
| thunderbird (PTS) | bullseye | 1:115.12.0-1~deb11u1 | fixed |
| bullseye (security) | 1:128.5.0esr-1~deb11u1 | fixed | |
| bookworm | 1:115.16.0esr-1~deb12u1 | fixed | |
| bookworm (security) | 1:128.5.0esr-1~deb12u1 | fixed | |
| sid, trixie | 1:128.5.2esr-1 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|---|---|---|---|---|---|
| firefox | source | (unstable) | 87.0-1 | |||
| firefox-esr | source | stretch | 78.9.0esr-1~deb9u1 | DLA-2607-1 | ||
| firefox-esr | source | buster | 78.9.0esr-1~deb10u1 | DSA-4874-1 | ||
| firefox-esr | source | (unstable) | 78.9.0esr-1 | |||
| thunderbird | source | stretch | 1:78.9.0-1~deb9u1 | DLA-2609-1 | ||
| thunderbird | source | buster | 1:78.9.0-1~deb10u1 | DSA-4876-1 | ||
| thunderbird | source | (unstable) | 1:78.9.0-1 |
https://www.mozilla.org/en-US/security/advisories/mfsa2021-10/#CVE-2021-23984
https://www.mozilla.org/en-US/security/advisories/mfsa2021-11/#CVE-2021-23984
https://www.mozilla.org/en-US/security/advisories/mfsa2021-12/#CVE-2021-23984