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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| neutrinolabs | xrdp | < 0.9.23 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | xrdp | 0.9.24-2 | — |
| Debian 13 | xrdp | 0.9.24-2 | — |
| Debian 12 | xrdp | 0.9.21.1-1+deb12u1 | — |
| Debian 11 | xrdp | 0.9.21.1-1~deb11u2 | DLA-4166-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 25.10 | xrdp | 0.10.1-3.1+deb13u1build0.25.10.1 | USN-8476-1 |
Show 6 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 24.04 LTS | xrdp | 0.9.24-4ubuntu0.1~esm1 | USN-8476-1 |
| Ubuntu Pro 22.04 LTS | xrdp | 0.9.17-2ubuntu2+esm1 | USN-8476-1, USN-6474-1 |
| Ubuntu Pro 20.04 LTS | xrdp | 0.9.12-1ubuntu0.1+esm1 | USN-8476-1, USN-6474-1 |
| Ubuntu Pro 18.04 LTS | xrdp | 0.9.5-2ubuntu0.1~esm2 | USN-8476-1, USN-6474-1 |
| Ubuntu Pro 16.04 LTS | xrdp | 0.6.1-2ubuntu0.3+esm3 | USN-6474-1 |
| Ubuntu Pro 14.04 LTS | xrdp | 0.6.0-1ubuntu0.1+esm3 | USN-6474-1 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP5 | xrdp | 0.9.13.1-150200.4.24.1 | SUSE-SU-2023:3830-1 |
| SLES 15 SP4 | xrdp | 0.9.13.1-150200.4.24.1 | SUSE-SU-2023:3830-1 |
| SLES 12 SP5 | xrdp | 0.9.10-3.11.1 | SUSE-SU-2023:4873-1, SUSE-SU-2023:3735-1 |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 12 SP5 | xrdp | 0.9.10-3.11.1 | SUSE-SU-2023:4873-1, SUSE-SU-2023:3735-1 |
| SUSE Manager Server 4.2 | xrdp | 0.9.13.1-150200.4.24.1 | SUSE-SU-2023:3830-1 |
| SUSE Manager Proxy 4.2 | xrdp | 0.9.13.1-150200.4.24.1 | SUSE-SU-2023:3830-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | xrdp | 0.9.23.1-1.1 | openSUSE-SU-2024:13399-1 |
| openSUSE Leap 15.5 | xrdp | 0.9.13.1-150200.4.24.1 | SUSE-SU-2023:3830-1 |
| openSUSE Leap 15.4 | xrdp | 0.9.13.1-150200.4.24.1 | SUSE-SU-2023:3830-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | xrdp | 0.9.23-r0 | — |
| Alpine v3.23 | xrdp | 0.9.23-r0 | — |
| Alpine v3.22 | xrdp | 0.9.23-r0 | — |
| Alpine v3.21 | xrdp | 0.9.23-r0 | — |
| Alpine v3.20 | xrdp | 0.9.23-r0 | — |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | xrdp | 0.9.23-r0 | — |
| Alpine v3.18 | xrdp | 0.9.23-r0 | — |
Advisories 7
- USN-6474-1 xrdp vulnerabilities Ubuntu Security Notices (USN) · Jun 29, 2026
- USN-8476-1 xrdp vulnerabilities Ubuntu Security Notices (USN) · Jun 25, 2026
- DLA-4166-1 xrdp - security update Debian Security (DSA / DLA) · Mar 9, 2026
- SUSE-SU-2023:4873-1 Security update for xrdp SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2023:3735-1 Security update for xrdp SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:13399-1 libpainter0-0.9.23.1-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2023:3830-1 Security update for xrdp SUSE / openSUSE Security Updates · Feb 4, 2026
References
- https://github.com/neutrinolabs/xrdp/security/advisories/GHSA-f489-557v-47jq
- https://github.com/neutrinolabs/xrdp/commit/a111a0fdfe2421ef600e40708b5f0168594cfb23
- https://github.com/neutrinolabs/xrdp/blame/9bbb2ec68f390504c32f2062847aa3d821a0089a/sesman/sesexec/session.c#L571C5-L571C19
- 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/SOT237TIHTHPX5YNIWLVNINOEYC7WMG2/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/URO3FKTFBPNKFARAQBEJLI4MH6YS35P5/