CVE-2023-40184— Improper handling of session establishment errors in xrdp
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I. Basic Information for CVE-2023-40184
Vulnerability Information
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Vulnerability Title
Improper handling of session establishment errors in xrdp
Source: NVD (National Vulnerability Database)
Vulnerability Description
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.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:N/I:N/A:L
Source: NVD (National Vulnerability Database)
Vulnerability Type
对异常条件的处理不恰当
Source: NVD (National Vulnerability Database)
Vulnerability Title
xrdp 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
xrdp是Neutrinolabs实验室的一款开源远程桌面协议服务器。 xrdp 0.9.23之前版本存在安全漏洞，该漏洞源于 xrdp-sesman 内部处理不当，导致会话限制被绕过。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| neutrinolabs | xrdp | < 0.9.23 | - |
II. Public POCs for CVE-2023-40184
| # | POC Description | Source Link | Shenlong Link |
|---|
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- https://github.com/neutrinolabs/xrdp/security/advisories/GHSA-f489-557v-47jqx_refsource_CONFIRM
- https://nvd.nist.gov/vuln/detail/CVE-2023-40184
IV. Related Vulnerabilities
Same product: xrdp
- CVE-2026-35512
xrdp: Heap buffer overflow in EGFX channel - CVE-2026-33689
xrdp: Pre-authentication out-of-bounds reads in channel pars - CVE-2026-33145
xrdp: Authenticated RCE via unsanitized AlternateShell execu - CVE-2026-32624
xrdp: Heap buffer overflow in xrdp_sec_process_logon_info() - CVE-2026-33516
xrdp: Pre-authentication out-of-bounds reads in RDP capabili
Same vendor: neutrinolabs
- CVE-2026-35512
xrdp: Heap buffer overflow in EGFX channel - CVE-2026-33689
xrdp: Pre-authentication out-of-bounds reads in channel pars - CVE-2026-33145
xrdp: Authenticated RCE via unsanitized AlternateShell execu - CVE-2026-32624
xrdp: Heap buffer overflow in xrdp_sec_process_logon_info() - CVE-2026-33516
xrdp: Pre-authentication out-of-bounds reads in RDP capabili
Same weakness: CWE-755
- CVE-2026-23666
.NET Framework Denial of Service Vulnerability - CVE-2026-40074
SvelteKit's invalidated redirect in handle hook causes Denia - CVE-2026-28542
Huawei EMUI和Huawei HarmonyOS 安全漏洞 - CVE-2026-27195
Wasmtime is vulnerable to panic when dropping a `[Typed]Func - CVE-2026-27586
Caddy's mTLS client authentication silently fails open when
V. Comments for CVE-2023-40184
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