Vulnerability 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 Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Mozilla | Firefox | < 78.0 |
| Fedoraproject | Fedora | 32 |
| Opensuse | Leap | 15.1 |
| Debian | Debian Linux | 9.0 |
Related Weaknesses (CWE)
References
- http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00016.htmlThird Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00018.htmlThird Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00027.htmlThird Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00049.htmlThird Party Advisory
- https://bugzilla.mozilla.org/show_bug.cgi?id=1631597Issue TrackingPermissions RequiredVendor Advisory
- https://lists.debian.org/debian-lts-announce/2020/09/msg00029.htmlMailing ListThird Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://security.gentoo.org/glsa/202007-10Third Party Advisory
- https://usn.ubuntu.com/4417-1/Third Party Advisory
- https://usn.ubuntu.com/4417-2/Third Party Advisory
- https://www.debian.org/security/2020/dsa-4726Third Party Advisory
- https://www.mozilla.org/security/advisories/mfsa2020-24/Vendor Advisory
- http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00016.htmlThird Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00018.htmlThird Party Advisory
FAQ
What is CVE-2020-12402?
CVE-2020-12402 is a vulnerability with a CVSS score of 4.4 (MEDIUM). 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 perfor...
How severe is CVE-2020-12402?
CVE-2020-12402 has been rated MEDIUM with a CVSS base score of 4.4/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2020-12402?
Check the references section above for vendor advisories and patch information. Affected products include: Mozilla Firefox, Fedoraproject Fedora, Opensuse Leap, Debian Debian Linux.