ArchLinuxASA-202101-7[ASA-202101-7] mbedtls: private key recovery
5.5 Medium
CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
2.1 Low
CVSS2
Access Vector
LOCAL
Access Complexity
LOW
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
NONE
Availability Impact
NONE
AV:L/AC:L/Au:N/C:P/I:N/A:N
0.001 Low
EPSS
Percentile
22.5%
Arch Linux Security Advisory ASA-202101-7
Severity: High
Date : 2021-01-08
CVE-ID : CVE-2020-16150
Package : mbedtls
Type : private key recovery
Remote : No
Link : https://security.archlinux.org/AVG-1386
Summary
The package mbedtls before version 2.25.0-1 is vulnerable to private
key recovery.
Resolution
Upgrade to 2.25.0-1.
pacman -Syu “mbedtls>=2.25.0-1”
The problem has been fixed upstream in version 2.25.0.
Workaround
None.
Description
A Lucky 13 timing side channel in mbedtls_ssl_decrypt_buf in
library/ssl_msg.c in Trusted Firmware Mbed TLS through 2.23.0 allows an
attacker to recover secret key information. This affects CBC mode
because of a computed time difference based on a padding length. The
issue is fixed in Mbed TLS 2.24.0, 2.16.8 and 2.7.17.
Impact
An attacker might be able to recover secret key information via a side-
channel.
References
https://bugs.archlinux.org/task/69128
https://tls.mbed.org/tech-updates/security-advisories/mbedtls-security-advisory-2020-09-1
https://security.archlinux.org/CVE-2020-16150
Related
5.5 Medium
CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
2.1 Low
CVSS2
Access Vector
LOCAL
Access Complexity
LOW
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
NONE
Availability Impact
NONE
AV:L/AC:L/Au:N/C:P/I:N/A:N
0.001 Low
EPSS
Percentile
22.5%