CVE-2020-4044 Information
Share on: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.
CVSS Vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Reference
http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00036.html http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00037.html https://github.com/neutrinolabs/xrdp/commit/0c791d073d0eb344ee7aaafd221513dc9226762c https://github.com/neutrinolabs/xrdp/releases/tag/v0.9.13.1 https://github.com/neutrinolabs/xrdp/security/advisories/GHSA-j9fv-6fwf-p3g4 https://lists.debian.org/debian-lts-announce/2020/08/msg00015.html https://www.debian.org/security/2020/dsa-4737
Attack Complexity
LOW
Privileges Required
LOW
User Interaction Required
LOW
Scope
NONE
Confidentiality Impact
UNCHANGED
Integrity Impact
HIGH
Availability Impact
HIGH
Base Score
HIGH
Base Severity
7.8