UBUNTU-CVE-2023-40184

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    UBUNTU-CVE-2023-40184

    Published: 30 Aug 2023Last Modified: 25 Jun 2026
    Upstream:
    CVE-2023-40184

    Summary:

    Details: 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.

    References: https://ubuntu.com/security/CVE-2023-40184, https://github.com/neutrinolabs/xrdp/security/advisories/GHSA-f489-557v-47jq, https://github.com/neutrinolabs/xrdp/commit/25a1fab5b6c5ef2a8bb109232b765cb8b332ce5e, https://github.com/neutrinolabs/xrdp/commit/a111a0fdfe2421ef600e40708b5f0168594cfb23, https://github.com/neutrinolabs/xrdp/blame/9bbb2ec68f390504c32f2062847aa3d821a0089a/sesman/sesexec/session.c#L571C5-L571C19, https://ubuntu.com/security/notices/USN-6474-1, https://www.cve.org/CVERecord?id=CVE-2023-40184, https://ubuntu.com/security/notices/USN-8476-1

    Affected packages

    Package

    Name: xrdp

    Purl: pkg:deb/ubuntu/xrdp?arch=source&distro=trusty%2Fesm

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -0.6.0-1ubuntu0.1+esm3

    Affected versions

    0.6.0-1
    0.6.0-1ubuntu0.1
    0.6.0-1ubuntu0.1+esm1
    0.6.0-1ubuntu0.1+esm2

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    UBUNTU-CVE-2023-40184 | CVE-DB