4.7 Medium
CVSS3
Attack Vector
LOCAL
Attack Complexity
HIGH
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
1.9 Low
CVSS2
Access Vector
LOCAL
Access Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
NONE
Availability Impact
NONE
AV:L/AC:M/Au:N/C:P/I:N/A:N
Arm Mbed TLS is vulnerable to Information Disclosure. An attacker that can get precise enough side-channel measurements can recover the long-term ECDSA private key by (1) reconstructing the projective coordinate of the result of scalar multiplication by exploiting side channels in the conversion to affine coordinates; (2) using an attack described by Naccache, Smart, and Stern in 2003 to recover a few bits of the ephemeral scalar from those projective coordinates via several measurements; and (3) using a lattice attack to get from there to the long-term ECDSA private key used for the signatures. Typically an attacker would have sufficient access when attacking an SGX enclave and controlling the untrusted OS.
CPE | Name | Operator | Version |
---|---|---|---|
mbedtls:3.10 | eq | 2.16.1-r1 | |
mbedtls:edge | eq | 2.16.3-r0 | |
mbedtls:edge | eq | 2.16.5-r0 | |
mbedtls:3.10 | eq | 2.16.1-r1 | |
mbedtls:edge | eq | 2.16.3-r0 | |
mbedtls:edge | eq | 2.16.5-r0 |
lists.debian.org/debian-lts-announce/2022/12/msg00036.html
lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FCWN5HIF4CJ2LZTOMEBJ7Q4IMMV7ZU2V/
lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZNOS2IIBH5WNJXZUV546PY7666DE7Y3L/
lists.fedoraproject.org/archives/list/[email protected]/message/FCWN5HIF4CJ2LZTOMEBJ7Q4IMMV7ZU2V/
lists.fedoraproject.org/archives/list/[email protected]/message/ZNOS2IIBH5WNJXZUV546PY7666DE7Y3L/
tls.mbed.org/tech-updates/releases/mbedtls-2.16.6-and-2.7.15-released
tls.mbed.org/tech-updates/security-advisories
tls.mbed.org/tech-updates/security-advisories/mbedtls-security-advisory-2020-04
4.7 Medium
CVSS3
Attack Vector
LOCAL
Attack Complexity
HIGH
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
1.9 Low
CVSS2
Access Vector
LOCAL
Access Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
NONE
Availability Impact
NONE
AV:L/AC:M/Au:N/C:P/I:N/A:N