cbcvebase.
CVE-2020-4044
published 2020-06-30

CVE-2020-4044: 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…

PriorityP345high7.8CVSS 3.1
AVLACLPRLUINSUCHIHAH
EPSS
2.40%
82.0th percentile
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.

Affected

6 ranges
VendorProductVersion rangeFixed in
debianxrdp< xrdp 0.9.12-1.1 (bookworm)xrdp 0.9.12-1.1 (bookworm)
neutrinolabsxrdp< 0.9.13.10.9.13.1
neutrinolabsxrdp>= 0 < 0.9.12-1.10.9.12-1.1
neutrinolabsxrdp>= 0 < 0.9.12-1.10.9.12-1.1
neutrinolabsxrdp>= 0 < 0.9.12-1.10.9.12-1.1
neutrinolabsxrdp>= 0 < 0.9.12-1.10.9.12-1.1

CVSS provenance

nvdv3.17.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
nvdv2.04.6MEDIUMAV:L/AC:L/Au:N/C:P/I:P/A:P
osv7.8HIGH
vendor_redhat9.6CRITICAL
vendor_debian7.5HIGH
Stop checking back — get the weekly exploitation signal.

Every Monday: what got weaponized or added to CISA KEV in the last seven days — each CVE cross-linked to its PoC, Nuclei template, and detection rule. Free, one email a week, unsubscribe in one click.