Linux Kernel up to 5.18.17 ksmbd fs/ksmbd/smb2pdu.c smb2_write information disclosure

Summaryinfo

A vulnerability, which was classified as critical, has been found in Linux Kernel up to 5.18.17. Affected by this issue is the function smb2_write of the file fs/ksmbd/smb2pdu.c of the component ksmbd. This manipulation causes information disclosure. The identification of this vulnerability is CVE-2022-47940. It is possible to initiate the attack remotely. There is no exploit available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability has been found in Linux Kernel up to 5.18.17 (Operating System) and classified as critical. Affected by this vulnerability is the function smb2_write of the file fs/ksmbd/smb2pdu.c of the component ksmbd. The manipulation with an unknown input leads to a information disclosure vulnerability. The CWE definition for the vulnerability is CWE-200. The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. As an impact it is known to affect confidentiality. The summary by CVE is:

An issue was discovered in ksmbd in the Linux kernel before 5.18.18. fs/ksmbd/smb2pdu.c lacks length validation in the non-padding case in smb2_write.

The weakness was shared 12/23/2022. It is possible to read the advisory at git.kernel.org. This vulnerability is known as CVE-2022-47940 since 12/23/2022. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1592 according to MITRE ATT&CK.

The vulnerability scanner Nessus provides a plugin with the ID 249854 (Linux Distros Unpatched Vulnerability : CVE-2022-47940), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 5.18.18 eliminates this vulnerability. The upgrade is hosted for download at cdn.kernel.org. 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.

The vulnerability is also documented in the vulnerability database at Tenable (249854). Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Type

• Operating System

Vendor

• Linux

Name

• Kernel

Version

• 5.18.0
• 5.18.1
• 5.18.2
• 5.18.3
• 5.18.4
• 5.18.5
• 5.18.6
• 5.18.7
• 5.18.8
• 5.18.9
• 5.18.10
• 5.18.11
• 5.18.12
• 5.18.13
• 5.18.14
• 5.18.15
• 5.18.16
• 5.18.17

License

• open-source

Website

• Vendor: https://www.kernel.org/

CPE 2.3info

• 🔍
• 🔍
• 🔍

CPE 2.2info

• 🔍
• 🔍
• 🔍

CVSSv4info

CVSSv3info

CVSSv2info

Exploitinginfo

Threat Intelligenceinfo

Countermeasuresinfo

Timelineinfo

Sourcesinfo

Entryinfo

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

Discussion