CVE-2020-4044
xrdp - security update
Description
The xrdp-sesman service before version 0.9.13.1 can be crashed by connecting over port 3350 and supplying a malicious payload. Once the xrdp-sesman process is dead, an unprivileged attacker on the server could then proceed to start their own imposter sesman service listening on port 3350. This will allow them to capture any user credentials that are submitted to XRDP and approve or reject arbitrary login credentials. For xorgxrdp sessions in particular, this allows an unauthorized user to hijack an existing session. This is a buffer overflow attack, so there may be a risk of arbitrary code execution as well.
How to fix CVE-2020-4044
To remediate CVE-2020-4044, upgrade the affected package to a fixed version below.
- —upgrade to 0.9.12-1.1 or later
- —upgrade to 0.9.1-9+deb9u4 or later
- —upgrade to 0.9.9-1+deb10u1 or later
Is CVE-2020-4044 being exploited?
Low — EPSS is 0.6%, meaning exploitation activity has not been observed at scale.
Affected packages (3)
- from 0, < 0.9.12-1.1
- from 0, < 0.9.1-9+deb9u4
- from 0, < 0.9.9-1+deb10u1
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | HIGH7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |