CVE-2023-40184

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.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
2.6 LOW
NETWORK
HIGH
LOW
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:N/I:N/A:L
Base Score
CVSS 3.x
EPSS Score
Percentile: 18%
Affected Products (NVD)
VendorProductVersion
neutrinolabsxrdp
𝑥
< 0.9.23
𝑥
= Vulnerable software versions
Debian logo
Debian Releases
Debian Product
Codename
xrdp
bookworm
no-dsa
bullseye
no-dsa
bullseye (security)
vulnerable
buster
no-dsa
sid
0.10.1-3
fixed
trixie
0.10.1-3
fixed
Ubuntu logo
Ubuntu Releases
Ubuntu Product
Codename
xrdp
bionic
Fixed 0.9.5-2ubuntu0.1~esm2
released
focal
Fixed 0.9.12-1ubuntu0.1+esm1
released
jammy
Fixed 0.9.17-2ubuntu2+esm1
released
lunar
ignored
mantic
ignored
noble
needs-triage
oracular
not-affected
trusty
Fixed 0.6.0-1ubuntu0.1+esm3
released
xenial
Fixed 0.6.1-2ubuntu0.3+esm3
released
openSUSE logo
openSUSE / SLES Releases
openSUSE Product
Release
libpainter0
suse enterprise desktop 15 SP4
0.9.13.1-150200.4.24.1
fixed
suse enterprise desktop 15 SP5
0.9.13.1-150200.4.24.1
fixed
suse enterprise desktop 15 SP6
0.9.13.1-150600.13.3
fixed
suse enterprise desktop 15 SP7
0.9.13.1-150600.15.3.1
fixed
suse enterprise sap 15 SP4
0.9.13.1-150200.4.24.1
fixed
suse enterprise sap 15 SP5
0.9.13.1-150200.4.24.1
fixed
suse enterprise sap 15 SP6
0.9.13.1-150600.13.3
fixed
suse enterprise sap 15 SP7
0.9.13.1-150600.15.3.1
fixed
suse enterprise server 15 SP4
0.9.13.1-150200.4.24.1
fixed
suse enterprise server 15 SP5
0.9.13.1-150200.4.24.1
fixed
suse enterprise server 15 SP6
0.9.13.1-150600.13.3
fixed
suse enterprise server 15 SP7
0.9.13.1-150600.15.3.1
fixed
librfxencode0
suse enterprise desktop 15 SP4
0.9.13.1-150200.4.24.1
fixed
suse enterprise desktop 15 SP5
0.9.13.1-150200.4.24.1
fixed
suse enterprise desktop 15 SP6
0.9.13.1-150600.13.3
fixed
suse enterprise desktop 15 SP7
0.9.13.1-150600.15.3.1
fixed
suse enterprise sap 15 SP4
0.9.13.1-150200.4.24.1
fixed
suse enterprise sap 15 SP5
0.9.13.1-150200.4.24.1
fixed
suse enterprise sap 15 SP6
0.9.13.1-150600.13.3
fixed
suse enterprise sap 15 SP7
0.9.13.1-150600.15.3.1
fixed
suse enterprise server 15 SP4
0.9.13.1-150200.4.24.1
fixed
suse enterprise server 15 SP5
0.9.13.1-150200.4.24.1
fixed
suse enterprise server 15 SP6
0.9.13.1-150600.13.3
fixed
suse enterprise server 15 SP7
0.9.13.1-150600.15.3.1
fixed
xrdp
suse enterprise desktop 15 SP4
0.9.13.1-150200.4.24.1
fixed
suse enterprise desktop 15 SP5
0.9.13.1-150200.4.24.1
fixed
suse enterprise desktop 15 SP6
0.9.13.1-150600.13.3
fixed
suse enterprise desktop 15 SP7
0.9.13.1-150600.15.3.1
fixed
suse enterprise sap 15 SP4
0.9.13.1-150200.4.24.1
fixed
suse enterprise sap 15 SP5
0.9.13.1-150200.4.24.1
fixed
suse enterprise sap 15 SP6
0.9.13.1-150600.13.3
fixed
suse enterprise sap 15 SP7
0.9.13.1-150600.15.3.1
fixed
suse enterprise server 15 SP4
0.9.13.1-150200.4.24.1
fixed
suse enterprise server 15 SP5
0.9.13.1-150200.4.24.1
fixed
suse enterprise server 15 SP6
0.9.13.1-150600.13.3
fixed
suse enterprise server 15 SP7
0.9.13.1-150600.15.3.1
fixed
xrdp-devel
suse enterprise desktop 15 SP4
0.9.13.1-150200.4.24.1
fixed
suse enterprise desktop 15 SP5
0.9.13.1-150200.4.24.1
fixed
suse enterprise desktop 15 SP6
0.9.13.1-150600.13.3
fixed
suse enterprise desktop 15 SP7
0.9.13.1-150600.15.3.1
fixed
suse enterprise sap 15 SP4
0.9.13.1-150200.4.24.1
fixed
suse enterprise sap 15 SP5
0.9.13.1-150200.4.24.1
fixed
suse enterprise sap 15 SP6
0.9.13.1-150600.13.3
fixed
suse enterprise sap 15 SP7
0.9.13.1-150600.15.3.1
fixed
suse enterprise server 15 SP4
0.9.13.1-150200.4.24.1
fixed
suse enterprise server 15 SP5
0.9.13.1-150200.4.24.1
fixed
suse enterprise server 15 SP6
0.9.13.1-150600.13.3
fixed
suse enterprise server 15 SP7
0.9.13.1-150600.15.3.1
fixed
Common Weakness Enumeration
References
https://github.com/neutrinolabs/xrdp/blame/9bbb2ec68f390504c32f2062847aa3d821a0089a/sesman/sesexec/session.c#L571C5-L571C19
https://github.com/neutrinolabs/xrdp/commit/a111a0fdfe2421ef600e40708b5f0168594cfb23
https://github.com/neutrinolabs/xrdp/security/advisories/GHSA-f489-557v-47jq
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/SOT237TIHTHPX5YNIWLVNINOEYC7WMG2/
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/U5IXMQODV3OIJ7DRQBUQV7PUKNT7SH36/
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/URO3FKTFBPNKFARAQBEJLI4MH6YS35P5/
https://github.com/neutrinolabs/xrdp/blame/9bbb2ec68f390504c32f2062847aa3d821a0089a/sesman/sesexec/session.c#L571C5-L571C19
https://github.com/neutrinolabs/xrdp/commit/a111a0fdfe2421ef600e40708b5f0168594cfb23
https://github.com/neutrinolabs/xrdp/security/advisories/GHSA-f489-557v-47jq
https://lists.debian.org/debian-lts-announce/2025/05/msg00018.html
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/SOT237TIHTHPX5YNIWLVNINOEYC7WMG2/
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/U5IXMQODV3OIJ7DRQBUQV7PUKNT7SH36/
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/URO3FKTFBPNKFARAQBEJLI4MH6YS35P5/