Vulnerability · Published Aug 6, 2024 · Assigned by mozilla
CVE-2024-7531
Medium 6.3
In plain English
A medium-severity security flaw in Firefox from Mozilla. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 38% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
Calling `PK11_Encrypt()` in NSS using CKM_CHACHA20 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | firefox-esr | 115.14.0esr-1~deb12u1 | DEBIAN-CVE-2024-7531 |
| Debian:12 | firefox-esr | 115.14.0esr-1~deb12u1 | DSA-5740-1 |
| Debian:13 | firefox-esr | 115.14.0esr-1 | DEBIAN-CVE-2024-7531 |
| Debian:14 | firefox-esr | 115.14.0esr-1 | DEBIAN-CVE-2024-7531 |
| Debian:12 | nss | no fix listed | DEBIAN-CVE-2024-7531 |
| Debian:13 | nss | 2:3.103-1 | DEBIAN-CVE-2024-7531 |
| Debian:14 | nss | 2:3.103-1 | DEBIAN-CVE-2024-7531 |
| Ubuntu:22.04:LTS | mozjs102 | no fix listed | UBUNTU-CVE-2024-7531 |
| Ubuntu:24.04:LTS | mozjs102 | no fix listed | UBUNTU-CVE-2024-7531 |
| Ubuntu:24.04:LTS | mozjs115 | no fix listed | UBUNTU-CVE-2024-7531 |
| Ubuntu:22.04:LTS | mozjs78 | no fix listed | UBUNTU-CVE-2024-7531 |
| Ubuntu:22.04:LTS | mozjs91 | no fix listed | UBUNTU-CVE-2024-7531 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Mozilla | Firefox | unspecified – before 129 |
| Mozilla | Firefox ESR | unspecified – before 115.14 |
| Mozilla | Firefox ESR | unspecified – before 128.1 |
Weakness: CWE-367 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L