First published: Tue Nov 21 2023(Updated: )
On some systems—depending on the graphics settings and drivers—it was possible to force an out-of-bounds read and leak memory data into the images created on the canvas element.
On some systems—depending on the graphics settings and drivers—it was possible to force an out-of-bounds read and leak memory data into the images created on the canvas element. This vulnerability affects Firefox < 120, Firefox ESR < 115.5.0, and Thunderbird < 115.5.
Credit: security@mozilla.org security@mozilla.org
Affected Software | Affected Version | How to fix |
---|---|---|
Mozilla Thunderbird | <115.5 | 115.5 |
Mozilla Firefox | <120 | 120 |
Mozilla Firefox ESR | <115.5 | 115.5 |
Mozilla Firefox | <120.0 | |
Mozilla Firefox ESR | <115.5.0 | |
Mozilla Thunderbird | <115.5 | |
Debian Debian Linux | =10.0 | |
Debian Debian Linux | =11.0 | |
Debian Debian Linux | =12.0 | |
redhat/firefox | <115.5 | 115.5 |
redhat/thunderbird | <115.5 | 115.5 |
ubuntu/firefox | <120.0+ | 120.0+ |
ubuntu/thunderbird | <1:115.5.0+ | 1:115.5.0+ |
ubuntu/thunderbird | <1:115.5.0+ | 1:115.5.0+ |
ubuntu/thunderbird | <1:115.5.0+ | 1:115.5.0+ |
ubuntu/thunderbird | <1:115.5.0+ | 1:115.5.0+ |
debian/firefox | 120.0.1-1 | |
debian/firefox-esr | <=91.12.0esr-1~deb10u1<=102.15.0esr-1~deb11u1<=102.15.1esr-1~deb12u1 | 115.5.0esr-1~deb10u1 115.5.0esr-1~deb11u1 115.5.0esr-1~deb12u1 115.5.0esr-1 |
debian/thunderbird | <=1:91.12.0-1~deb10u1<=1:102.13.1-1~deb11u1<=1:102.15.1-1~deb12u1 | 1:115.5.0-1~deb10u1 1:115.5.0-1~deb11u1 1:115.5.0-1~deb12u1 1:115.5.1-1 |
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(Appears in the following advisories)
(Found alongside the following vulnerabilities)
The severity of CVE-2023-6204 is high.
CVE-2023-6204 affects systems with Firefox versions < 120, Firefox versions < 115.5, and Thunderbird versions < 115.5.0.
CVE-2023-6204 can be exploited by forcing an out-of-bounds read and leaking memory data into canvas element images.
The remedy for CVE-2023-6204 is to update Firefox to version 120 or higher, Firefox to version 115.5 or higher, or Thunderbird to version 115.5.0 or higher.
You can find more information about CVE-2023-6204 in the Mozilla bugzilla and security advisories: [Mozilla Bugzilla](https://bugzilla.mozilla.org/show_bug.cgi?id=1841050), [Mozilla Security Advisory 2023-49](https://www.mozilla.org/security/advisories/mfsa2023-49/), [Mozilla Security Advisory 2023-50](https://www.mozilla.org/security/advisories/mfsa2023-50/).