CVE-2023-40184 Improper handling of session establishment errors in xrdp

2023-08-3017:48:30

CWE-755

GitHub_M

www.cve.org

improper handling

session establishment

xrdp

remote desktop protocol

bypassing restrictions

pam error

release version 0.9.23

CVSS3

2.6

Attack Vector

NETWORK

Attack Complexity

HIGH

Privileges Required

LOW

User Interaction

REQUIRED

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

LOW

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

AI Score

6.8

Confidence

High

EPSS

0.001

Percentile

49.9%

JSON

xrdp is an open source remote desktop protocol (RDP) server. In versions prior to 0.9.23 improper handling of session establishment errors allows bypassing OS-level session restrictions. The auth_start_session function can return non-zero (1) value on, e.g., PAM error which may result in in session restrictions such as max concurrent sessions per user by PAM (ex ./etc/security/limits.conf) to be bypassed. Users (administrators) don’t use restrictions by PAM are not affected. This issue has been addressed in release version 0.9.23. Users are advised to upgrade. There are no known workarounds for this issue.

CNA Affected

[
  {
    "vendor": "neutrinolabs",
    "product": "xrdp",
    "versions": [
      {
        "version": "< 0.9.23",
        "status": "affected"
      }
    ]
  }
]