ARM Mbed TLS up to 2.16.6/2.22.x Modular Exponentiation information exposure

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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2.4$0-$5k0.00

A vulnerability, which was classified as problematic, was found in ARM Mbed TLS up to 2.16.6/2.22.x. This affects some unknown functionality of the component Modular Exponentiation Handler. The manipulation with an unknown input leads to a information exposure vulnerability. CWE is classifying the issue as CWE-203. The product behaves differently or sends different responses under different circumstances in a way that is observable to an unauthorized actor, which exposes security-relevant information about the state of the product, such as whether a particular operation was successful or not. This is going to have an impact on confidentiality.

The weakness was disclosed 07/19/2021. This vulnerability is uniquely identified as CVE-2020-36421. Technical details are unknown but a public exploit is available. The attack technique deployed by this issue is T1592 according to MITRE ATT&CK.

The exploit is shared for download at github.com. It is declared as proof-of-concept.

Upgrading to version 2.16.7 or 2.23.0 eliminates this vulnerability. The upgrade is hosted for download at github.com.

Productinfo

Vendor

Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB CVSS-B Score: 🔍
VulDB CVSS-BT Score: 🔍
VulDB Vector: 🔍
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CVSSv3info

VulDB Meta Base Score: 2.6
VulDB Meta Temp Score: 2.4

VulDB Base Score: 2.6
VulDB Temp Score: 2.4
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Class: Information exposure
CWE: CWE-203 / CWE-200 / CWE-284
ATT&CK: T1592

Local: No
Remote: Partially

Availability: 🔍
Access: Public
Status: Proof-of-Concept
Download: 🔍

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: Mbed TLS 2.16.7/2.23.0

Timelineinfo

07/19/2021 🔍
07/19/2021 +0 days 🔍
07/19/2021 +0 days 🔍
07/22/2021 +3 days 🔍

Sourcesinfo

Status: Confirmed

CVE: CVE-2020-36421 (🔍)
scip Labs: https://www.scip.ch/en/?labs.20161013

Entryinfo

Created: 07/19/2021 21:37
Updated: 07/22/2021 10:01
Changes: 07/19/2021 21:37 (41), 07/22/2021 10:01 (2)
Complete: 🔍

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