Linux Kernel up to 5.10.8 NFS Export fs/nfsd/nfs3xdr.c no_subtree_check path traversal

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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6.1$0-$5k0.00

A vulnerability was found in Linux Kernel up to 5.10.8 (Operating System) and classified as critical. This issue affects the function no_subtree_check of the file fs/nfsd/nfs3xdr.c of the component NFS Export Handler. The manipulation with an unknown input leads to a path traversal vulnerability. Using CWE to declare the problem leads to CWE-22. The software uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the software does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. Impacted is confidentiality, integrity, and availability.

The weakness was shared 01/19/2021. The advisory is shared at patchwork.kernel.org. The identification of this vulnerability is CVE-2021-3178. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1006 for this issue.

The real existence of this vulnerability is still doubted at the moment.

Applying a patch is able to eliminate this problem. The bugfix is ready for download at patchwork.kernel.org.

Productinfo

Type

Vendor

Name

License

  • open-source

CPE 2.3info

CPE 2.2info

CVSSv3info

VulDB Meta Base Score: 6.4
VulDB Meta Temp Score: 6.2

VulDB Base Score: 6.3
VulDB Temp Score: 6.0
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 6.5
NVD Vector: 🔍

CVSSv2info

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

NVD Base Score: 🔍

Exploitinginfo

Class: Path traversal
CWE: CWE-22
ATT&CK: T1006

Local: No
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: patchwork.kernel.org

Timelineinfo

01/19/2021 🔍
01/19/2021 +0 days 🔍
01/19/2021 +0 days 🔍
02/15/2021 +27 days 🔍

Sourcesinfo

Vendor: kernel.org

Advisory: patchwork.kernel.org
Status: Confirmed
Disputed: 🔍

CVE: CVE-2021-3178 (🔍)

Entryinfo

Created: 01/19/2021 02:26 PM
Updated: 02/15/2021 09:59 AM
Changes: 01/19/2021 02:26 PM (43), 02/15/2021 09:54 AM (5), 02/15/2021 09:59 AM (18)
Complete: 🔍

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