util-linux FUSE Filesystem file access

CVSS Meta Temp Score
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CTI Interest Score
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5.3$0-$5k0.00

Summaryinfo

A vulnerability classified as problematic has been found in util-linux. Affected by this vulnerability is an unknown functionality of the component FUSE Filesystem Handler. This manipulation causes file access. This vulnerability is handled as CVE-2021-3995. The attack can be initiated remotely. There is not any exploit available. It is recommended to apply a patch to fix this issue.

Detailsinfo

A vulnerability has been found in util-linux (version now known) and classified as problematic. Affected by this vulnerability is some unknown processing of the component FUSE Filesystem Handler. The manipulation with an unknown input leads to a file access vulnerability. The CWE definition for the vulnerability is CWE-552. The product makes files or directories accessible to unauthorized actors, even though they should not be. As an impact it is known to affect integrity, and availability. The summary by CVE is:

A logic error was found in the libmount library of util-linux in the function that allows an unprivileged user to unmount a FUSE filesystem. This flaw allows an unprivileged local attacker to unmount FUSE filesystems that belong to certain other users who have a UID that is a prefix of the UID of the attacker in its string form. An attacker may use this flaw to cause a denial of service to applications that use the affected filesystems.

The weakness was released 08/24/2022 as 57202f5713afa2af20ffbb6ab5331481d0396f8d. It is possible to read the advisory at github.com. This vulnerability is known as CVE-2021-3995 since 11/22/2021. The technical details are unknown and an exploit is not publicly available. The attack technique deployed by this issue is T1083 according to MITRE ATT&CK.

Applying the patch 57202f5713afa2af20ffbb6ab5331481d0396f8d is able to eliminate this problem. The bugfix is ready for download at github.com.

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Productinfo

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License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.4
VulDB Meta Temp Score: 5.3

VulDB Base Score: 5.4
VulDB Temp Score: 5.2
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 5.5
NVD Vector: 🔍

CVSSv2info

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

Exploitinginfo

Class: File access
CWE: CWE-552 / CWE-425
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Patch
Status: 🔍

0-Day Time: 🔍

Patch: 57202f5713afa2af20ffbb6ab5331481d0396f8d

Timelineinfo

11/22/2021 🔍
08/24/2022 +274 days 🔍
08/24/2022 +0 days 🔍
09/25/2022 +32 days 🔍

Sourcesinfo

Product: github.com

Advisory: 57202f5713afa2af20ffbb6ab5331481d0396f8d
Status: Confirmed

CVE: CVE-2021-3995 (🔍)
GCVE (CVE): GCVE-0-2021-3995
GCVE (VulDB): GCVE-100-207031

Entryinfo

Created: 08/24/2022 07:52
Updated: 09/25/2022 08:13
Changes: 08/24/2022 07:52 (40), 09/25/2022 08:13 (10)
Complete: 🔍
Cache ID: 216::103

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