Vulnerability CVE-2020-12402
Published: 2020-07-09

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.

Type:

CWE-327

 (Use of a Broken or Risky Cryptographic Algorithm)

CVSS2 => (AV:N/AC:M/Au:N/C:P/I:N/A:N)

CVSS Base Score
Impact Subscore
Exploitability Subscore
4.3/10
2.9/10
8.6/10
Exploit range
Attack complexity
Authentication
Remote
Medium
No required
Confidentiality impact
Integrity impact
Availability impact
Partial
None
None
Affected software
Mozilla -> Firefox 

 References:
http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00016.html
http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00018.html
https://bugzilla.mozilla.org/show_bug.cgi?id=1631597
https://usn.ubuntu.com/4417-1/
https://www.mozilla.org/security/advisories/mfsa2020-24/
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