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CVE-2020-12402

Date: July 9, 2020

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

4.4

Related Resources (19)

Url: https://usn.ubuntu.com/4417-2/

Url: http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00049.html

Url: https://usn.ubuntu.com/4417-1/

Url: http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00018.html

Url: https://people.canonical.com/~ubuntu-security/cve/CVE-2020-12402

Url: https://security.alpinelinux.org/vuln/CVE-2020-12402

Url: https://security-tracker.debian.org/tracker/CVE-2020-12402

Url: http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00016.html

Url: https://www.debian.org/security/2020/dsa-4726

Url: https://access.redhat.com/security/cve/CVE-2020-12402

Url: https://nvd.nist.gov/vuln/detail/CVE-2020-12402

Url: https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/UWVDJRARXNWWWTCGMM63EXLQHH2LNOXO/

Url: http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00027.html

Url: https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/RFL6UNFK4MG2WDXLMLFAEIUSM5EUK7CG/

Url: https://security.gentoo.org/glsa/202007-10

Url: https://lists.debian.org/debian-lts-announce/2020/09/msg00029.html

Url: https://bugzilla.mozilla.org/show_bug.cgi?id=1631597

Url: https://www.mozilla.org/security/advisories/mfsa2020-24/

Url: https://www.mend.io/vulnerability-database/CVE-2020-12402

Severity Score

4.4

Weakness Type (CWE)

Use of a Broken or Risky Cryptographic Algorithm

CWE-327

Observable Discrepancy

CWE-203

CVSS v3.1

Base Score:	4.4
Attack Vector (AV):	LOCAL
Attack Complexity (AC):	HIGH
Privileges Required (PR):	LOW
User Interaction (UI):	REQUIRED
Scope (S):	UNCHANGED
Confidentiality (C):	HIGH
Integrity (I):	NONE
Availability (A):	NONE

CVSS v2

Base Score:	1.2
Access Vector (AV):	LOCAL
Access Complexity (AC):	HIGH
Authentication (AU):	NONE
Confidentiality (C):	PARTIAL
Integrity (I):	NONE
Availability (A):	NONE
Additional information:

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CVE-2020-12402

Date: July 9, 2020

Severity Score

Related Resources (19)

Severity Score

Weakness Type (CWE)

CVSS v3.1

CVSS v2

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