CVE-2020-4044 Detail

Current 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.


View Analysis Description

Severity



CVSS 3.x Severity and Metrics:

NIST CVSS score
NIST: NVD
Base Score:  7.8 HIGH
Vector:  CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Nist CVSS score does not match with CNA score
CNA:  GitHub, Inc.
Base Score:  7.5 HIGH
Vector:  CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H


NVD Analysts use publicly available information to associate vector strings and CVSS scores. We also display any CVSS information provided within the CVE List from the CNA.

Note: It is possible that the NVD CVSS may not match that of the CNA. The most common reason for this is that publicly available information does not provide sufficient detail or that information simply was not available at the time the CVSS vector string was assigned.

References to Advisories, Solutions, and Tools

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Hyperlink Resource
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 Patch  Third Party Advisory 
https://github.com/neutrinolabs/xrdp/releases/tag/v0.9.13.1 Release Notes  Third Party Advisory 
https://github.com/neutrinolabs/xrdp/security/advisories/GHSA-j9fv-6fwf-p3g4 Third Party Advisory 
https://lists.debian.org/debian-lts-announce/2020/08/msg00015.html
https://www.debian.org/security/2020/dsa-4737

Weakness Enumeration

CWE-ID CWE Name Source
CWE-121 Stack-based Buffer Overflow Provider acceptance level GitHub, Inc.  

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Change History

6 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2020-4044
NVD Published Date:
06/30/2020
NVD Last Modified:
08/14/2020
Source:
MITRE