The xrdp-sesman service before version 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.
Source: xrdp (LP Ubuntu Debian)
Upstream:released (0.9.1-9+deb9u4, 0.9.9-1+deb10u1, 0.9.12-1.1)
Ubuntu 12.04 ESM (Precise Pangolin):DNE
Ubuntu 14.04 ESM (Trusty Tahr):needed
Ubuntu 16.04 LTS (Xenial Xerus):needed
Ubuntu 18.04 LTS (Bionic Beaver):needed
Ubuntu 20.04 LTS (Focal Fossa):needed
Ubuntu 20.10 (Groovy Gorilla):not-affected (0.9.12-1.1)
More Information

Updated: 2020-09-09 23:36:38 UTC (commit 81a23a978c4436cd99e1d040e9e73e9146876281)