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FreeBSD : xrdp -- Local users can perform a buffer overflow attack against the xrdp-sesman service and then inpersonate it (2675f0db-baa5-11ea-aa12-80ee73419af3)

high Nessus Plugin ID 137930

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Synopsis

The remote FreeBSD host is missing a security-related update.

Description

Ashley Newson reports :

The xrdp-sesman service 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.

Solution

Update the affected package.

See Also

http://www.nessus.org/u?815cc2fc

http://www.nessus.org/u?61361f33

Plugin Details

Severity: High

ID: 137930

File Name: freebsd_pkg_2675f0dbbaa511eaaa1280ee73419af3.nasl

Version: 1.3

Type: local

Published: 7/1/2020

Updated: 7/15/2020

Supported Sensors: 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:freebsd:freebsd:xrdp, cpe:/o:freebsd:freebsd

Required KB Items: Host/local_checks_enabled, Host/FreeBSD/release, Host/FreeBSD/pkg_info

Exploit Ease: No known exploits are available

Patch Publication Date: 6/30/2020

Vulnerability Publication Date: 6/2/2020

Reference Information

CVE: CVE-2020-4044