CVE-2020-12402

Advisory lineage Upstream: 0 Downstream: 23
Modified
Published: 09 Jul 2020, 14:53
Last modified:04 Aug 2024, 11:56

Vulnerability Summary

Overall Risk (default)
low
18/100
CVSS Score
4.4 MEDIUM
v3.1 (nvd)
EPSS Score
0.1% LOW
0% probability 0.00%
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

09 Jul 2020, 14:53
Published
Vulnerability first disclosed
04 Aug 2024, 11:56
Last Modified
Vulnerability information updated

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.

CVSS Metrics

  • v3.1•MEDIUM•Score: 4.4CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:N/A:N
  • v2.0•LOW•Score: 1.2AV:L/AC:H/Au:N/C:P/I:N/A:N

EPSS Trends

Current EPSS score: 0.10%• Percentile: 27%

Techniques & Countermeasures

  • CWE-203•Observable Discrepancy

    The product behaves differently or sends different responses under different circumstances in a way that is observable to an unauthorized actor.

Affected Systems

  • debian•debian_linux

    9.0

  • fedoraproject•fedora

    32

  • mozilla•firefox

    < 78.0 | ≥ unspecified, < 78

  • opensuse•leap

    15.1 | 15.2

References (13)