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
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
Thunderbirdto a version that resolves this vulnerability.Fixed in 115.6 - Upgrade
Upgrade
Firefoxto a version that resolves this vulnerability.Fixed in 121 - Upgrade
Upgrade
Firefox ESRto a version that resolves this vulnerability.Fixed in 115.6 - Upgrade
Upgrade
debian/firefoxto a version that resolves this vulnerability.Fixed in 137.0.2-1 - Upgrade
Upgrade
debian/firefox-esrto a version that resolves this vulnerability.Fixed in 115.14.0esr-1~deb11u1Fixed in 128.9.0esr-1~deb11u1Fixed in 128.8.0esr-1~deb12u1Fixed in 128.9.0esr-1~deb12u1Fixed in 128.9.0esr-2 - Upgrade
Upgrade
debian/thunderbirdto a version that resolves this vulnerability.Fixed in 1:115.12.0-1~deb11u1Fixed in 1:128.9.0esr-1~deb11u1Fixed in 1:128.8.0esr-1~deb12u1Fixed in 1:128.9.0esr-1~deb12u1Fixed in 1:128.9.0esr-1 - Upgrade
Upgrade
redhat/firefoxto a version that resolves this vulnerability.Fixed in 115.6 - Upgrade
Upgrade
redhat/thunderbirdto a version that resolves this vulnerability.Fixed in 115.6
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.