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Debian DLA-2319-1 : xrdp security update

high Nessus Plugin ID 139430

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Synopsis

The remote Debian host is missing a security update.

Description

xrdp-sesman service in xrdp 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.

For Debian 9 stretch, this problem has been fixed in version 0.9.1-9+deb9u4.

We recommend that you upgrade your xrdp packages.

For the detailed security status of xrdp please refer to its security tracker page at: https://security-tracker.debian.org/tracker/xrdp

NOTE: Tenable Network Security has extracted the preceding description block directly from the DLA security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

Solution

Upgrade the affected xorgxrdp, and xrdp packages.

See Also

https://lists.debian.org/debian-lts-announce/2020/08/msg00015.html

https://packages.debian.org/source/stretch/xrdp

https://security-tracker.debian.org/tracker/source-package/xrdp

Plugin Details

Severity: High

ID: 139430

File Name: debian_DLA-2319.nasl

Version: 1.3

Type: local

Agent: unix

Published: 8/10/2020

Updated: 2/26/2024

Supported Sensors: Frictionless Assessment Agent, Nessus Agent, Agentless Assessment, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 5.9

CVSS v2

Risk Factor: Medium

Base Score: 4.6

Temporal Score: 3.4

Vector: CVSS2#AV:L/AC:L/Au:N/C:P/I:P/A:P

CVSS Score Source: CVE-2020-4044

CVSS v3

Risk Factor: High

Base Score: 7.8

Temporal Score: 6.8

Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: p-cpe:/a:debian:debian_linux:xorgxrdp, p-cpe:/a:debian:debian_linux:xrdp, cpe:/o:debian:debian_linux:9.0

Required KB Items: Host/local_checks_enabled, Host/Debian/release, Host/Debian/dpkg-l

Exploit Ease: No known exploits are available

Patch Publication Date: 8/9/2020

Vulnerability Publication Date: 6/30/2020

Reference Information

CVE: CVE-2020-4044