CVE-2021-24119

openSUSE Security Advisory - openSUSE-SU-2021:1389-1

Severity Score

4.9

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

In Trusted Firmware Mbed TLS 2.24.0, a side-channel vulnerability in base64 PEM file decoding allows system-level (administrator) attackers to obtain information about secret RSA keys via a controlled-channel and side-channel attack on software running in isolated environments that can be single stepped, especially Intel SGX.

En Trusted Firmware Mbed versión TLS versión 2.24.0, una vulnerabilidad de canal lateral en la decodificación de archivos PEM base64, permite a atacantes a nivel de sistema (administrador) obtener información sobre claves RSA secretas por medio de un ataque de canal controlado y de canal lateral en el software ejecutándose entornos aislados que pueden ser de un solo paso, especialmente Intel SGX

An update that fixes one vulnerability is now available. This update for mbedtls fixes the following issues. Fixed side-channel vulnerability in base64 PEM [boo#1189589] Guard against strong local side channel attack against base64 tables by making access aceess to them use constant flow code.

*Credits: N/A

Attack Vector

Network

Attack Complexity

Low

Privileges Required

High

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

None

Attack Vector

Network

Attack Complexity

Low

Authentication

Single

Confidentiality

Partial

Integrity

None

Availability

None

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2021-01-14 CVE Reserved
2021-07-14 CVE Published
2024-08-03 CVE Updated
2025-07-03 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-203: Observable Discrepancy

CAPEC

References (6)

URL	Tag	Source
https://github.com/ARMmbed/mbedtls/releases	Release Notes
https://github.com/UzL-ITS/util-lookup/blob/main/cve-vulnerability-publication.md	Release Notes
https://lists.debian.org/debian-lts-announce/2021/11/msg00021.html	Mailing List
https://lists.debian.org/debian-lts-announce/2022/12/msg00036.html	Mailing List

URL	Date	SRC

URL	Date	SRC

URL	Date	SRC
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DRRVY7DMTX3ECFNZKDYTSFEG5AI2HBC6	2023-02-24
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/EYJW7HAW3TDV2YMDFYXP3HD6WRQRTLJW	2023-02-24

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Arm Search vendor "Arm"		Mbed Tls Search vendor "Arm" for product "Mbed Tls"				< 2.26.0 Search vendor "Arm" for product "Mbed Tls" and version " < 2.26.0"		-		Affected
Fedoraproject Search vendor "Fedoraproject"		Fedora Search vendor "Fedoraproject" for product "Fedora"				33 Search vendor "Fedoraproject" for product "Fedora" and version "33"		-		Affected
Fedoraproject Search vendor "Fedoraproject"		Fedora Search vendor "Fedoraproject" for product "Fedora"				34 Search vendor "Fedoraproject" for product "Fedora" and version "34"		-		Affected
Debian Search vendor "Debian"		Debian Linux Search vendor "Debian" for product "Debian Linux"				9.0 Search vendor "Debian" for product "Debian Linux" and version "9.0"		-		Affected
Debian Search vendor "Debian"		Debian Linux Search vendor "Debian" for product "Debian Linux"				10.0 Search vendor "Debian" for product "Debian Linux" and version "10.0"		-		Affected