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4.3
CVE-2023-29533: Firefox and Thunderbird may hide fullscreen warning, enabling spoofing
CVE-2023-29533 · published 3 years ago
Summary
Certain older versions of Firefox, Firefox for Android, Firefox Focus for Android, Firefox ESR, and Thunderbird can conceal the notification that appears when a page enters fullscreen mode. This can confuse users and allow malicious sites to pretend they are trustworthy. Updating the browsers to the latest releases removes the issue.
What to do
- Update debian firefox-esr to version 102.10.0esr-1~deb11u1.
- Update debian firefox-esr to version 102.10.0esr-1.
- Update debian thunderbird to version 1:102.10.0-1~deb11u1.
- Update debian thunderbird to version 1:102.10.0-1.
Affected software
| Ecosystem | Vendor | Product | Affected versions |
|---|---|---|---|
| Debian:11 | debian | firefox-esr |
< 102.10.0esr-1~deb11u1 Fix: upgrade to 102.10.0esr-1~deb11u1
|
| Debian:12 | debian | firefox-esr |
< 102.10.0esr-1 Fix: upgrade to 102.10.0esr-1
|
| Debian:13 | debian | firefox-esr |
< 102.10.0esr-1 Fix: upgrade to 102.10.0esr-1
|
| Debian:14 | debian | firefox-esr |
< 102.10.0esr-1 Fix: upgrade to 102.10.0esr-1
|
| Debian:11 | debian | thunderbird |
< 1:102.10.0-1~deb11u1 Fix: upgrade to 1:102.10.0-1~deb11u1
|
| Debian:12 | debian | thunderbird |
< 1:102.10.0-1 Fix: upgrade to 1:102.10.0-1
|
| Debian:13 | debian | thunderbird |
< 1:102.10.0-1 Fix: upgrade to 1:102.10.0-1
|
| Debian:14 | debian | thunderbird |
< 1:102.10.0-1 Fix: upgrade to 1:102.10.0-1
|
Original advisory text
A website could have obscured the fullscreen notification by using a combination of <code>window.open</code>, fullscreen requests, <code>window.name</code> assignments, and <code>setInterval</code>...
A website could have obscured the fullscreen notification by using a combination of <code>window.open</code>, fullscreen requests, <code>window.name</code> assignments, and <code>setInterval</code> calls. This could have led to user confusion and possible spoofing attacks. This vulnerability affects Firefox < 112, Focus for Android < 112, Firefox ESR < 102.10, Firefox for Android < 112, and Thunderbird < 102.10.
References
- https://security-tracker.debian.org/tracker/CVE-2023-29533 Vendor Advisory
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/29xxx/CVE-2023-29533... Vendor Advisory
- https://nvd.nist.gov/vuln/detail/CVE-2023-29533 Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2023-13/ Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2023-14/ Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2023-15/ Vendor Advisory
- https://bugzilla.mozilla.org/show_bug.cgi?id=1798219 Third Party Advisory
- https://bugzilla.mozilla.org/show_bug.cgi?id=1814597 Third Party Advisory
Internet-facing
60 days
Internal
At next upgrade
- Not known to be exploited
- Needs hands-on effort to exploit
- Gives an attacker partial control
Timeline
Published2 Jun 2023
Updated4 Nov 2026
First seen21 Aug 2026
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