CVE-2020-4044
Severity CVSS v4.0:
Pending analysis
Type:
CWE-121
Stack-based Buffer Overflow
Publication date:
30/06/2020
Last modified:
14/08/2020
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.
Impact
Base Score 3.x
7.80
Severity 3.x
HIGH
Base Score 2.0
4.60
Severity 2.0
MEDIUM
Vulnerable products and versions
CPE | From | Up to |
---|---|---|
cpe:2.3:a:neutrinolabs:xrdp:*:*:*:*:*:*:*:* | 0.9.13.1 (excluding) |
To consult the complete list of CPE names with products and versions, see this page
References to Advisories, Solutions, and Tools
- 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