| Name | CVE-2024-7531 |
| 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. |
| Source | CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
| References | DSA-5740-1 |
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|---|---|---|
| firefox (PTS) | sid | 134.0.2-2 | fixed |
| firefox-esr (PTS) | bullseye | 115.14.0esr-1~deb11u1 | fixed |
| bullseye (security) | 128.6.0esr-1~deb11u3 | fixed | |
| bookworm | 128.5.0esr-1~deb12u1 | fixed | |
| bookworm (security) | 128.6.0esr-1~deb12u1 | fixed | |
| trixie | 128.5.0esr-1 | fixed | |
| sid | 128.6.0esr-4 | fixed | |
| nss (PTS) | bullseye | 2:3.61-1+deb11u3 | fixed |
| bullseye (security) | 2:3.61-1+deb11u4 | fixed | |
| bookworm, bookworm (security) | 2:3.87.1-1+deb12u1 | vulnerable | |
| sid, trixie | 2:3.107-1 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|---|---|---|---|---|---|
| firefox | source | (unstable) | 129.0-1 | |||
| firefox-esr | source | bullseye | 115.14.0esr-1~deb11u1 | DSA-5740-1 | ||
| firefox-esr | source | bookworm | 115.14.0esr-1~deb12u1 | DSA-5740-1 | ||
| firefox-esr | source | (unstable) | 115.14.0esr-1 | |||
| nss | source | bullseye | (not affected) | |||
| nss | source | (unstable) | 2:3.103-1 |
[bookworm] - nss <ignored> (Minor issue)
[bullseye] - nss <not-affected> (Vulnerable code introduced in 3.72)
https://bugzilla.mozilla.org/show_bug.cgi?id=1905691
https://www.mozilla.org/en-US/security/advisories/mfsa2024-33/#CVE-2024-7531
https://www.mozilla.org/en-US/security/advisories/mfsa2024-34/#CVE-2024-7531
https://firefox-source-docs.mozilla.org/security/nss/releases/nss_3_102_1.html
Fixed by: https://hg.mozilla.org/projects/nss/rev/525c5044cc9e53f5015c697b04b1405df91003ac
Fixed by: https://hg.mozilla.org/projects/nss/rev/b0b0b68f8c764bf7848ca94f8b011e4bf192dc3f (NSS_3_90_BRANCH)
https://groups.google.com/a/mozilla.org/g/dev-tech-crypto/c/h3Q2S0n2vTg/m/abQtMoYYAgAJ