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Improper handling of session establishment errors allows bypassing OS-level session restrictions

Low
metalefty published GHSA-f489-557v-47jq Aug 30, 2023

Package

xrdp

Affected versions

< 0.9.23

Patched versions

0.9.23

Description

Impact

Session restrictions such as max concurrent sessions per user by PAM (ex ./etc/security/limits.conf) are bypassed because of improper handling inside xrdp-sesman. Users (administrators) don't use restrictions by PAM are not affected.

Patches

A fix has been prepared and will be released as v0.9.23.

Severity

Low

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
High
Privileges required
Low
User interaction
Required
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
Low

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:N/I:N/A:L

CVE ID

CVE-2023-40184

Weaknesses

No CWEs

Credits