VDB-226277 · CVE-2021-40506 · GCVE-0-2021-40506

OpenRISC OR1200 ALU Unit memory corruption

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.
8.7	$0-$5k	0.00

Summaryinfo

A vulnerability identified as critical has been detected in OpenRISC OR1200. The impacted element is an unknown function of the component ALU Unit. The manipulation leads to memory corruption. This vulnerability is uniquely identified as CVE-2021-40506. No exploit exists. Applying a patch is the recommended action to fix this issue.

Detailsinfo

A vulnerability was found in OpenRISC OR1200 (affected version not known). It has been rated as critical. This issue affects some unknown functionality of the component ALU Unit. The manipulation with an unknown input leads to a memory corruption vulnerability. Using CWE to declare the problem leads to CWE-119. The product performs operations on a memory buffer, but it can read from or write to a memory location that is outside of the intended boundary of the buffer. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

An issue was discovered in the ALU unit of the OR1200 (aka OpenRISC 1200) processor 2011-09-10 through 2015-11-11. The overflow flag is not being updated for the msb and mac instructions, which results in an incorrect value in the overflow flag. Any software that relies on this flag may experience corruption in execution.

The weakness was disclosed 04/18/2023 as 2c0765d7ba12813df273cd693a99c4e744f0fbd5. The advisory is shared at github.com. The identification of this vulnerability is CVE-2021-40506 since 09/03/2021. Neither technical details nor an exploit are publicly available.

Applying the patch 2c0765d7ba12813df273cd693a99c4e744f0fbd5 is able to eliminate this problem. The bugfix is ready for download at github.com.

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Productinfo

Vendor

OpenRISC

Name

OR1200

License

open-source

Website

Product: https://github.com/openrisc/or1200/

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 8.9
VulDB Meta Temp Score: 8.7

VulDB Base Score: 8.0
VulDB Temp Score: 7.6
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 9.8
NVD Vector: 🔍

CVSSv2info

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

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Class: Memory corruption
CWE: CWE-119
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

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: Patch
Status: 🔍

0-Day Time: 🔍

Patch: 2c0765d7ba12813df273cd693a99c4e744f0fbd5

Timelineinfo

09/03/2021 🔍
04/18/2023 +592 days 🔍
04/18/2023 +0 days 🔍
05/05/2023 +17 days 🔍

Sourcesinfo

Product: github.com

Advisory: 2c0765d7ba12813df273cd693a99c4e744f0fbd5
Status: Confirmed

CVE: CVE-2021-40506 (🔍)
GCVE (CVE): GCVE-0-2021-40506
GCVE (VulDB): GCVE-100-226277

Entryinfo

Created: 04/18/2023 16:18
Updated: 05/05/2023 22:07
Changes: 04/18/2023 16:18 (41), 05/05/2023 22:07 (11)
Complete: 🔍
Cache ID: 216::103