SB2019122025 - Security restrictions bypass in Sudo 

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Main Vulnerability Database SB2019122025

SB2019122025 - Security restrictions bypass in Sudo

Published: December 20, 2019 Updated: January 30, 2020

Security Bulletin ID SB2019122025
Severity
Low
Patch available
YES
Number of vulnerabilities 2
Exploitation vector Local access
Highest impact Data manipulation

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 2 secuirty vulnerabilities.


1) Permissions, Privileges, and Access Controls (CVE-ID: CVE-2019-19234)

The vulnerability allows a local user to impersonate other users on the system.

The vulnerability exists due to incorrect handling of the blocked users (e.g., by using the ! character in the shadow file instead of a password hash) in sudo. A local user with access to a Runas ALL sudoer account can impersonate blocked users.


2) Permissions, Privileges, and Access Controls (CVE-ID: CVE-2019-19232)

The vulnerability allows a local user to impersonate nonexistent users.

The vulnerability exists in sudo due to incorrect processing of numeric uids that are not associated with any existing user account. A local user with access to a Runas ALL sudoer accountcan impersonate a a nonexistent user.


Remediation

Install update from vendor's website.

References