CVE-2020-12402
Published: August 31, 2023Last modified: August 31, 2023
Description
During RSA key generation, bignum implementations used a variation of the Binary Extended Euclidean Algorithm which entailed significantly input-dependent flow. This allowed an attacker able to perform electromagnetic-based side channel attacks to record traces leading to the recovery of the secret primes. *Note:* An unmodified Firefox browser does not generate RSA keys in normal operation and is not affected, but products built on top of it might. This vulnerability affects Firefox < 78.
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score | 4.4 |
| Attack Vector | LOCAL |
| Attack complexity | HIGH |
| Privileges required | LOW |
| User interaction | REQUIRED |
| Scope | UNCHANGED |
| Confidentiality | HIGH |
| Integrity impact | NONE |
| Availability impact | NONE |
| Vector | CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:N/A:N |
Status
| Product | Release | Package | Status |
|---|---|---|---|
| Alpaquita Linux | 23 LTS | nss | Not affected (3.85-r1) |
| Stream | nss | Not affected (3.92-r0) |
References
- http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00016.html
- http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00018.html
- http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00027.html
- http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00049.html
- https://bugzilla.mozilla.org/show_bug.cgi?id=1631597
- https://lists.debian.org/debian-lts-announce/2020/09/msg00029.html
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RFL6UNFK4MG2WDXLMLFAEIUSM5EUK7CG/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UWVDJRARXNWWWTCGMM63EXLQHH2LNOXO/
- https://lists.fedoraproject.org/archives/list/[email protected]/message/RFL6UNFK4MG2WDXLMLFAEIUSM5EUK7CG/
- https://lists.fedoraproject.org/archives/list/[email protected]/message/UWVDJRARXNWWWTCGMM63EXLQHH2LNOXO/
- https://security.gentoo.org/glsa/202007-10
- https://usn.ubuntu.com/4417-1/
- https://usn.ubuntu.com/4417-2/
- https://www.debian.org/security/2020/dsa-4726
- https://www.mozilla.org/security/advisories/mfsa2020-24/