CVE-2019-19232

Description

It was found that sudo always allowed commands to be run with unknown user or group ids if the sudo configuration allowed it for example via the "ALL" alias. This could allow sudo to impersonate non-existent account and depending on how applications are configured, could lead to certain restriction bypass. This is now explicitly disabled. A new setting called "allow_unknown_runas_id" was introduced in order to enable this.

Statement

A new setting variable called "allow_unknown_runas_id" was introduced which would explicitly allow sudo to run applications with unknown user or group ids (Provided sudo was configured that way, for example via the runas parameter etc).

Mitigation

This flaw only affects specific, non-default configurations of sudo, in which sudoers configuration entry allows a user to run a command as any user except root. Any other configuration of sudo is not affected by this flaw.

Common Vulnerability Scoring System (CVSS) Score Details

Info alert:Important note

CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).

CVSS v3 Score Breakdown

Red HatNVDcve.org
Base Score7.57.5N/A
Attack VectorNetworkNetworkN/A
Attack ComplexityHighLowN/A
Privileges RequiredLowNoneN/A
User InteractionNoneNoneN/A
ScopeUnchangedUnchangedN/A
ConfidentialityHighNoneN/A
Integrity ImpactHighHighN/A
Availability ImpactHighNoneN/A

Vector

Red Hat: CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

NVD: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Understanding the Weakness (CWE)

CWE-284

Other

Technical Impact: Varies by Context

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