CVE-2023-6865: Medium severity Mozilla Firefox vulnerability
EncryptingOutputStream was susceptible to exposing uninitialized data. This issue could only be abused in order to write data to a local disk which may have implications for private browsing mode.
External Reference: https://www.mozilla.org/en-US/security/advisories/mfsa2023-54/#CVE-2023-6865
Other sources
EncryptingOutputStream was susceptible to exposing uninitialized data. This issue could only be abused in order to write data to a local disk which may have implications for private browsing mode. This vulnerability affects Firefox ESR < 115.6 and Firefox < 121.
— MITRE
EncryptingOutputStream was susceptible to exposing uninitialized data. This issue could only be abused in order to write data to a local disk which may have implications for private browsing mode.
— Mozilla
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- 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
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 - Upgrade
Upgrade
alpine/firefox-esrto a version that resolves this vulnerability.Fixed in 115.6.0-r0
Event History
Peer vulnerabilities
Found alongside the following vulnerabilities.
Frequently Asked Questions
What is the severity of CVE-2023-6865?
CVE-2023-6865 is considered a medium severity vulnerability due to potential data exposure in private browsing mode.
How do I fix CVE-2023-6865?
To fix CVE-2023-6865, update to Firefox version 121, or ensure you are using Firefox ESR version 115.14 or newer.
Which versions of Firefox are affected by CVE-2023-6865?
CVE-2023-6865 affects Firefox versions prior to 121 and Firefox ESR versions prior to 115.14.
Is CVE-2023-6865 present in Thunderbird?
Yes, CVE-2023-6865 affects Thunderbird versions up to 115.6.
Can CVE-2023-6865 be exploited remotely?
CVE-2023-6865 cannot be exploited remotely as it requires local write access.