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.
https://www.mozilla.org/security/advisories/mfsa2020-24/
https://bugzilla.mozilla.org/show_bug.cgi?id=1631597
http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00016.html
http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00018.html
https://usn.ubuntu.com/4417-1/
http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00027.html
https://www.debian.org/security/2020/dsa-4726
http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00049.html
https://security.gentoo.org/glsa/202007-10
https://usn.ubuntu.com/4417-2/
https://lists.debian.org/debian-lts-announce/2020/09/msg00029.html
Source: MITRE
Published: 2020-07-09
Updated: 2022-01-04
Type: CWE-203
Base Score: 1.2
Vector: AV:L/AC:H/Au:N/C:P/I:N/A:N
Impact Score: 2.9
Exploitability Score: 1.9
Severity: LOW
Base Score: 4.4
Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:N/A:N
Impact Score: 3.6
Exploitability Score: 0.8
Severity: MEDIUM