SB2020111016 - Permissions, Privileges, and Access Controls in samba (Alpine package)

CSH
CYBERSECURITY HELP
Sign In REGISTER

Main Vulnerability Database SB2020111016

SB2020111016 - Permissions, Privileges, and Access Controls in samba (Alpine package)

Published: November 10, 2020

Security Bulletin ID SB2020111016
Severity
Low
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Remote access
Highest impact Information disclosure

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 security vulnerability.


1) Permissions, Privileges, and Access Controls (CVE-ID: CVE-2020-14318)

The vulnerability allows a remote user to gain access to sensitive information.

The vulnerability exists due to the way "ChangeNotify" concept for SMB1/2/3 protocols was implemented in Samba. A missing permissions check on a directory handle requesting ChangeNotify means that a client with a directory handle open only for FILE_READ_ATTRIBUTES (minimal access rights) could be used to obtain change notify replies from the server. These replies contain information that should not be available to directory handles open for FILE_READ_ATTRIBUTE only. A local unprivileged user can abuse this lack of permissions check to obtain information about file changes.


Remediation

Install update from vendor's website.

References