Upstream information

CVE-2019-19234 at MITRE

Description

** DISPUTED ** In Sudo through 1.8.29, the fact that a user has been blocked (e.g., by using the ! character in the shadow file instead of a password hash) is not considered, allowing an attacker (who has access to a Runas ALL sudoer account) to impersonate any blocked user. NOTE: The software maintainer believes that this CVE is not valid. Disabling local password authentication for a user is not the same as disabling all access to that user--the user may still be able to login via other means (ssh key, kerberos, etc). Both the Linux shadow(5) and passwd(1) manuals are clear on this. Indeed it is a valid use case to have local accounts that are _only_ accessible via sudo and that cannot be logged into with a password. Sudo 1.8.30 added an optional setting to check the _shell_ of the target user (not the encrypted password!) against the contents of /etc/shells but that is not the same thing as preventing access to users with an invalid password hash.

SUSE information

Overall state of this security issue: Does not affect SUSE products

This issue is currently rated as having important severity.

CVSS v2 Scores
  National Vulnerability Database
Base Score 5
Vector AV:N/AC:L/Au:N/C:N/I:P/A:N
Access Vector Network
Access Complexity Low
Authentication None
Confidentiality Impact None
Integrity Impact Partial
Availability Impact None
CVSS v3 Scores
  National Vulnerability Database SUSE
Base Score 7.5 7.8
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Access Vector Network Local
Access Complexity Low Low
Privileges Required None Low
User Interaction None None
Scope Unchanged Unchanged
Confidentiality Impact None High
Integrity Impact High High
Availability Impact None High
CVSSv3 Version 3.1 3.1
SUSE Bugzilla entry: 1159616 [RESOLVED / INVALID]

No SUSE Security Announcements cross referenced.


Status of this issue by product and package

Please note that this evaluation state might be work in progress, incomplete or outdated. Also information for service packs in the LTSS phase is only included for issues meeting the LTSS criteria. If in doubt, feel free to contact us for clarification.

Product(s) Source package State
SUSE CaaS Platform 3.0 sudo Affected
SUSE Container as a Service Platform 1.0 sudo Affected
SUSE Container as a Service Platform 2.0 sudo Not affected
SUSE Linux Enterprise 15 Module for Basesystem sudo Not affected
SUSE Linux Enterprise 15-SP1 Module for Basesystem sudo Affected
SUSE Linux Enterprise Desktop 12 SP4 sudo Not affected
SUSE Linux Enterprise High Performance Computing 12 SP4 sudo Affected
SUSE Linux Enterprise High Performance Computing 12 SP5 sudo Affected
SUSE Linux Enterprise Server 11 SP1 sudo Not affected
SUSE Linux Enterprise Server 11 SP3 sudo Not affected
SUSE Linux Enterprise Server 11 SP4 LTSS sudo Not affected
SUSE Linux Enterprise Server 12 SP1 LTSS sudo Not affected
SUSE Linux Enterprise Server 12 SP2 sudo Not affected
SUSE Linux Enterprise Server 12 SP2 LTSS sudo Not affected
SUSE Linux Enterprise Server 12 SP3 LTSS sudo Not affected
SUSE Linux Enterprise Server 12 SP4 sudo Affected
SUSE Linux Enterprise Server 12 SP5 sudo Affected
SUSE Linux Enterprise Server for SAP Applications 12 SP2 sudo Not affected
SUSE Linux Enterprise Server for SAP Applications 12 SP3 sudo Not affected
SUSE Linux Enterprise Server for SAP Applications 12 SP4 sudo Affected
SUSE Linux Enterprise Server for SAP Applications 12 SP5 sudo Affected
SUSE Linux Enterprise Software Development Kit 12 SP4 sudo Affected
SUSE Linux Enterprise Software Development Kit 12 SP5 sudo Affected