Vulnerability · Published Dec 19, 2023 · Assigned by mozilla
CVE-2023-6856
High 8.8
In plain English
A high-severity security flaw in Firefox from Mozilla. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 20.6% (higher than 98% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS NVD)8.8High
Exploit odds (30 days)20.6%top 2.5% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known
Official description
The WebGL `DrawElementsInstanced` method was susceptible to a heap buffer overflow when used on systems with the Mesa VM driver. This issue could allow an attacker to perform remote code execution and sandbox escape. This vulnerability affects Firefox ESR < 115.6, Thunderbird < 115.6, and Firefox < 121.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux:8 | firefox | 115.6.0-1.el8_9.alma | ALSA-2024:0012 |
| AlmaLinux:9 | firefox | 115.6.0-1.el9_3.alma | ALSA-2024:0025 |
| AlmaLinux:9 | firefox-x11 | 115.6.0-1.el9_3.alma | ALSA-2024:0025 |
| AlmaLinux:8 | thunderbird | 115.6.0-1.el8_9.alma | ALSA-2024:0003 |
| AlmaLinux:9 | thunderbird | 115.6.0-1.el9_3.alma | ALSA-2024:0001 |
| Alpine:v3.20 | firefox-esr | 115.6.0-r0 | ALPINE-CVE-2023-6856 |
| Alpine:v3.21 | firefox-esr | 115.6.0-r0 | ALPINE-CVE-2023-6856 |
| Alpine:v3.22 | firefox-esr | 115.6.0-r0 | ALPINE-CVE-2023-6856 |
| Alpine:v3.23 | firefox-esr | 115.6.0-r0 | ALPINE-CVE-2023-6856 |
| Debian:12 | firefox-esr | 115.6.0esr-1~deb12u1 | DEBIAN-CVE-2023-6856 |
| Debian:12 | firefox-esr | 115.6.0esr-1~deb12u1 | DSA-5581-1 |
| Debian:13 | firefox-esr | 115.6.0esr-1 | DEBIAN-CVE-2023-6856 |
| Debian:14 | firefox-esr | 115.6.0esr-1 | DEBIAN-CVE-2023-6856 |
| Debian:12 | thunderbird | 1:115.6.0-1~deb12u1 | DSA-5582-1 |
| Debian:12 | thunderbird | 1:115.6.0-1~deb12u1 | DEBIAN-CVE-2023-6856 |
| Debian:13 | thunderbird | 1:115.6.0-1 | DEBIAN-CVE-2023-6856 |
| Debian:14 | thunderbird | 1:115.6.0-1 | DEBIAN-CVE-2023-6856 |
| Rocky Linux:8 | firefox | 0:115.6.0-1.el8_9 | RLSA-2024:0012 |
| Rocky Linux:8 | thunderbird | 0:115.6.0-1.el8_9 | RLSA-2024:0003 |
| Ubuntu:22.04:LTS | mozjs102 | no fix listed | UBUNTU-CVE-2023-6856 |
| Ubuntu:24.04:LTS | mozjs102 | no fix listed | UBUNTU-CVE-2023-6856 |
| Ubuntu:22.04:LTS | mozjs78 | no fix listed | UBUNTU-CVE-2023-6856 |
| Ubuntu:22.04:LTS | mozjs91 | no fix listed | UBUNTU-CVE-2023-6856 |
| Ubuntu:22.04:LTS | thunderbird | 1:115.6.0+build2-0ubuntu0.22.04.1 | USN-6563-1 |
| Ubuntu:22.04:LTS | thunderbird | 1:115.6.0+build2-0ubuntu0.22.04.1 | UBUNTU-CVE-2023-6856 |
| Ubuntu:24.04:LTS | thunderbird | 1:115.6.0+build2-0ubuntu1 | UBUNTU-CVE-2023-6856 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Mozilla | Firefox ESR | unspecified – before 115.6 |
| Mozilla | Thunderbird | unspecified – before 115.6 |
| Mozilla | Firefox | unspecified – before 121 |
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=1843782
- https://www.mozilla.org/security/advisories/mfsa2023-54/
- https://www.mozilla.org/security/advisories/mfsa2023-55/
- https://www.mozilla.org/security/advisories/mfsa2023-56/
- https://www.debian.org/security/2023/dsa-5581
- https://www.debian.org/security/2023/dsa-5582
- https://lists.debian.org/debian-lts-announce/2023/12/msg00020.html
- https://lists.debian.org/debian-lts-announce/2023/12/msg00021.html
- https://security.gentoo.org/glsa/202401-10