VDB-174367 · CVE-2021-31872 · GCVE-0-2021-31872

klibc up to 2.0.8 on 32-bit cpio Command integer overflow

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.
5.3	$0-$5k	0.00

Summaryinfo

A vulnerability marked as critical has been reported in klibc up to 2.0.8 on 32-bit. The affected element is an unknown function of the component cpio Command. This manipulation causes integer overflow. This vulnerability is tracked as CVE-2021-31872. No exploit exists. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability classified as critical was found in klibc up to 2.0.8 on 32-bit. Affected by this vulnerability is an unknown code of the component cpio Command. The manipulation with an unknown input leads to a integer overflow vulnerability. The CWE definition for the vulnerability is CWE-190. The product performs a calculation that can produce an integer overflow or wraparound, when the logic assumes that the resulting value will always be larger than the original value. This can introduce other weaknesses when the calculation is used for resource management or execution control. As an impact it is known to affect confidentiality, integrity, and availability.

The weakness was disclosed 04/30/2021. It is possible to read the advisory at lists.zytor.com. This vulnerability is known as CVE-2021-31872. The technical details are unknown and an exploit is not publicly available.

Upgrading to version 2.0.9 eliminates this vulnerability. Applying a patch is able to eliminate this problem. The bugfix is ready for download at git.kernel.org. The best possible mitigation is suggested to be upgrading to the latest version.

Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Name

klibc

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.5
VulDB Meta Temp Score: 5.3

VulDB Base Score: 5.5
VulDB Temp Score: 5.3
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

AV	AC	Au	C	I	A
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💳	💳	💳	💳	💳	💳
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Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Class: Integer overflow
CWE: CWE-190 / CWE-189
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Partially

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: klibc 2.0.9
Patch: git.kernel.org

Timelineinfo

04/29/2021 🔍
04/30/2021 +1 days 🔍
04/30/2021 +0 days 🔍
05/03/2021 +3 days 🔍

Sourcesinfo

Advisory: lists.zytor.com
Status: Confirmed

CVE: CVE-2021-31872 (🔍)
GCVE (CVE): GCVE-0-2021-31872
GCVE (VulDB): GCVE-100-174367

Entryinfo

Created: 04/30/2021 14:47
Updated: 05/03/2021 21:24
Changes: 04/30/2021 14:47 (39), 05/03/2021 21:24 (5)
Complete: 🔍
Cache ID: 216::103