Vulnerability 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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Mozilla | Firefox | < 121.0 |
| Mozilla | Firefox Esr | < 115.6 |
| Mozilla | Thunderbird | < 115.6 |
| Apple | Macos | - |
| Android | - | |
| Linux | Linux Kernel | - |
| Debian | Debian Linux | 10.0 |
Related Weaknesses (CWE)
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=1796023Issue TrackingPermissions Required
- https://lists.debian.org/debian-lts-announce/2023/12/msg00020.htmlMailing ListThird Party Advisory
- https://lists.debian.org/debian-lts-announce/2023/12/msg00021.htmlMailing ListThird Party Advisory
- https://security.gentoo.org/glsa/202401-10Third Party Advisory
- https://www.debian.org/security/2023/dsa-5581Third Party Advisory
- https://www.debian.org/security/2023/dsa-5582Third Party Advisory
- https://www.mozilla.org/security/advisories/mfsa2023-54/Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2023-55/Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2023-56/Vendor Advisory
- https://bugzilla.mozilla.org/show_bug.cgi?id=1796023Issue TrackingPermissions Required
- https://lists.debian.org/debian-lts-announce/2023/12/msg00020.htmlMailing ListThird Party Advisory
- https://lists.debian.org/debian-lts-announce/2023/12/msg00021.htmlMailing ListThird Party Advisory
- https://security.gentoo.org/glsa/202401-10Third Party Advisory
- https://www.debian.org/security/2023/dsa-5581Third Party Advisory
- https://www.debian.org/security/2023/dsa-5582Third Party Advisory
FAQ
What is CVE-2023-6857?
CVE-2023-6857 is a vulnerability with a CVSS score of 5.3 (MEDIUM). 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...
How severe is CVE-2023-6857?
CVE-2023-6857 has been rated MEDIUM with a CVSS base score of 5.3/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2023-6857?
Check the references section above for vendor advisories and patch information. Affected products include: Mozilla Firefox, Mozilla Firefox Esr, Mozilla Thunderbird, Apple Macos, Google Android.