CVE-2024-7531: Medium severity Mozilla Firefox vulnerability
Calling PK11Encrypt() in NSS using CKMCHACHA20 and the same buffer for input and output can result in plaintext on an Intel Sandy Bridge processor. In Firefox this only affects the QUIC header protection feature when the connection is using the ChaCha20-Poly1305 cipher suite. The most likely outcome is connection failure, but if the connection persists despite the high packet loss it could be possible for a network observer to identify packets as coming from the same source despite a network path change. This vulnerability affects Firefox < 129, Firefox ESR < 115.14, and Firefox ESR < 128.1.
Other sources
Calling PK11Encrypt() in NSS using CKMCHACHA20 and the same buffer for input and output can result in plaintext on an Intel Sandy Bridge processor. In Firefox this only affects the QUIC header protection feature when the connection is using the ChaCha20-Poly1305 cipher suite. The most likely outcome is connection failure, but if the connection persists despite the high packet loss it could be possible for a network observer to identify packets as coming from the same source despite a network path change.
— Mozilla
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
Firefox ESRto a version that resolves this vulnerability.Fixed in 115.14 - Upgrade
Upgrade
Firefox ESRto a version that resolves this vulnerability.Fixed in 128.1 - Upgrade
Upgrade
debian/firefox-esrto a version that resolves this vulnerability.Fixed in 115.14.0esr-1~deb12u1 - Upgrade
Upgrade
debian/firefox-esrto a version that resolves this vulnerability.Fixed in 115.14.0esr-1 - Upgrade
Upgrade
debian/nssto a version that resolves this vulnerability.Fixed in 2:3.103-1 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 129 - Upgrade
Upgrade
debian/firefoxto a version that resolves this vulnerability.Fixed in 159.0.1-1 - Upgrade
Upgrade
debian/firefox-esrto a version that resolves this vulnerability.Fixed in 140.12.0esr-1~deb12u1Fixed in 153.6.0esr-1~deb12u2Fixed in 140.15.0esr-1~deb13u1Fixed in 153.6.0esr-1~deb13u1Fixed in 153.5.1esr-1Fixed in 153.6.0esr-1 - Upgrade
Upgrade
debian/nssto a version that resolves this vulnerability.Fixed in 2:3.110-1+deb13u4Fixed in 2:3.110-1+deb13u5Fixed in 2:3.132-1 - Upgrade
Upgrade
Firefoxto a version that resolves this vulnerability.Fixed in 129
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-2024-7531?
CVE-2024-7531 has a high severity rating due to the potential exposure of plaintext data.
How do I fix CVE-2024-7531?
To mitigate CVE-2024-7531, upgrade to Mozilla Firefox versions 129 or later or Firefox ESR versions 115.14 or later.
Which versions of Firefox are affected by CVE-2024-7531?
CVE-2024-7531 affects Firefox versions up to 129 and Firefox ESR versions up to 128.1.
What is the impact of CVE-2024-7531?
CVE-2024-7531 can lead to sensitive information exposure when using the ChaCha20-Poly1305 cipher suite in Firefox.
Is there a workaround for CVE-2024-7531?
The best approach for CVE-2024-7531 is to update to the recommended versions, as there are no specific workarounds.