Vulnerability · Published Dec 19, 2023 · Assigned by mozilla
CVE-2023-6857
Medium 5.3
In plain English
A medium-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 0.7% (higher than 52% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS NVD)5.3Medium
Exploit odds (30 days)0.7%top 48.0% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known
Official description
When resolving a symlink, a race may occur where the buffer passed to `readlink` may actually be smaller than necessary. *This bug only affects Firefox on Unix-based operating systems (Android, Linux, MacOS). Windows is unaffected.* 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-2023-6857 |
| Alpine:v3.21 | firefox-esr | 115.6.0-r0 | ALPINE-CVE-2023-6857 |
| Alpine:v3.22 | firefox-esr | 115.6.0-r0 | ALPINE-CVE-2023-6857 |
| Alpine:v3.23 | firefox-esr | 115.6.0-r0 | ALPINE-CVE-2023-6857 |
| Debian:12 | firefox-esr | 115.6.0esr-1~deb12u1 | DEBIAN-CVE-2023-6857 |
| Debian:12 | firefox-esr | 115.6.0esr-1~deb12u1 | DSA-5581-1 |
| Debian:13 | firefox-esr | 115.6.0esr-1 | DEBIAN-CVE-2023-6857 |
| Debian:14 | firefox-esr | 115.6.0esr-1 | DEBIAN-CVE-2023-6857 |
| Debian:12 | thunderbird | 1:115.6.0-1~deb12u1 | DSA-5582-1 |
| Debian:12 | thunderbird | 1:115.6.0-1~deb12u1 | DEBIAN-CVE-2023-6857 |
| Debian:13 | thunderbird | 1:115.6.0-1 | DEBIAN-CVE-2023-6857 |
| Debian:14 | thunderbird | 1:115.6.0-1 | DEBIAN-CVE-2023-6857 |
| 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-2023-6857 |
| Ubuntu:24.04:LTS | mozjs102 | no fix listed | UBUNTU-CVE-2023-6857 |
| Ubuntu:22.04:LTS | mozjs78 | no fix listed | UBUNTU-CVE-2023-6857 |
| Ubuntu:22.04:LTS | mozjs91 | no fix listed | UBUNTU-CVE-2023-6857 |
| 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-2023-6857 |
| Ubuntu:24.04:LTS | thunderbird | 1:115.6.0+build2-0ubuntu1 | UBUNTU-CVE-2023-6857 |
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=1796023
- 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