CVE-2023-6857: Race Condition
Last updated 24 July 2024
Other sources
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.
External Reference: https://www.mozilla.org/en-US/security/advisories/mfsa2023-54/#CVE-2023-6857
— Red Hat
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.
— MITRE
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.
— Mozilla
When resolving a symlink, a race may occur where the buffer passed to readlink may actually be smaller than necessary. This bug only affects Thunderbird on Unix-based operating systems (Android, Linux, MacOS). Windows is unaffected.
— Mozilla
Affected Software
Event History
Parent advisories
This vulnerability appears in the following advisories.
Peer vulnerabilities
Found alongside the following vulnerabilities.
Frequently Asked Questions
What is the severity of CVE-2023-6857?
CVE-2023-6857 is classified as a medium severity vulnerability, primarily affecting Firefox on Unix-based systems.
How do I fix CVE-2023-6857?
To fix CVE-2023-6857, update Firefox or Thunderbird to version 115.6 or later.
Which software is affected by CVE-2023-6857?
CVE-2023-6857 affects Firefox ESR, Mozilla Firefox, Thunderbird, and their respective package versions below 115.6.
On which operating systems does CVE-2023-6857 have an impact?
CVE-2023-6857 impacts Unix-based operating systems, including Android, Linux, and MacOS, while Windows is unaffected.
Is there a workaround for CVE-2023-6857?
Currently, the best approach for mitigating CVE-2023-6857 is to apply the recommended software updates.