SB2020030450 - Fedora 31 update for sudo

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Main Vulnerability Database SB2020030450

SB2020030450 - Fedora 31 update for sudo

Published: March 4, 2020 Updated: April 25, 2025

Security Bulletin ID SB2020030450
Severity
Low
Patch available
YES
Number of vulnerabilities 3
Exploitation vector Local access
Highest impact Code execution

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 3 secuirty vulnerabilities.


1) Stack-based buffer overflow (CVE-ID: CVE-2019-18634)

The vulnerability allows a local user to execute arbitrary code on the target system.

The vulnerability exists due to a boundary error within the getln() function in tgetpass.c, if pwfeedback is enabled in /etc/sudoers. A local user can trigger stack-based buffer overflow and execute arbitrary code on the target system with elevated privileges.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.


2) 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.


3) 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