VDB-161180 · CVE-2020-11683 · GCVE-0-2020-11683

AT91bootstrap up to 3.9.1 CMAC Timing information exposure

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
5.1	$0-$5k	0.00

Summaryinfo

A vulnerability described as critical has been identified in AT91bootstrap up to 3.9.1. This affects an unknown function of the component CMAC Handler. Such manipulation as part of Timing leads to information exposure. This vulnerability is referenced as CVE-2020-11683. The attack can be executed directly on the physical device. No exploit is available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in AT91bootstrap up to 3.9.1. It has been rated as problematic. Affected by this issue is an unknown code block of the component CMAC Handler. The manipulation as part of a Timing leads to a information exposure vulnerability. Using CWE to declare the problem leads to 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. Impacted is confidentiality, integrity, and availability. CVE summarizes:

A timing side channel was discovered in AT91bootstrap before 3.9.2. It can be exploited by attackers with physical access to forge CMAC values and subsequently boot arbitrary code on an affected system.

The weakness was published 09/14/2020. This vulnerability is handled as CVE-2020-11683 since 04/10/2020. The exploitation is known to be difficult. The attack needs to be approached locally. No form of authentication is required for exploitation. There are neither technical details nor an exploit publicly available. The MITRE ATT&CK project declares the attack technique as T1592.

Upgrading to version 3.9.2 eliminates this vulnerability.

Similar entry is available at VDB-161181. Once again VulDB remains the best source for vulnerability data.

Productinfo

Name

AT91bootstrap

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.3
VulDB Meta Temp Score: 5.3

VulDB Base Score: 3.9
VulDB Temp Score: 3.8
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 6.8
NVD Vector: 🔍

CVSSv2info

AV	AC	Au	C	I	A
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock

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

NVD Base Score: 🔍

Exploitinginfo

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

Physical: Yes
Local: Yes
Remote: No

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: AT91bootstrap 3.9.2

Timelineinfo

04/10/2020 🔍
09/14/2020 +157 days 🔍
09/14/2020 +0 days 🔍
09/14/2020 +0 days 🔍

Sourcesinfo

Status: Not defined

CVE: CVE-2020-11683 (🔍)
GCVE (CVE): GCVE-0-2020-11683
GCVE (VulDB): GCVE-100-161180
See also: 🔍

Entryinfo

Created: 09/14/2020 18:38
Updated: 09/14/2020 18:43
Changes: 09/14/2020 18:38 (38), 09/14/2020 18:43 (17)
Complete: 🔍
Cache ID: 216::103