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Debian DLA-2435-1 : guacamole-server security update

medium Nessus Plugin ID 142632

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Synopsis

The remote Debian host is missing a security update.

Description

The server component of Apache Guacamole, a remote desktop gateway, did not properly validate data received from RDP servers. This could result in information disclosure or even the execution of arbitrary code.

CVE-2020-9497

Apache Guacamole does not properly validate data received from RDP servers via static virtual channels. If a user connects to a malicious or compromised RDP server, specially crafted PDUs could result in disclosure of information within the memory of the guacd process handling the connection.

CVE-2020-9498

Apache Guacamole may mishandle pointers involved in processing data received via RDP static virtual channels. If a user connects to a malicious or compromised RDP server, a series of specially crafted PDUs could result in memory corruption, possibly allowing arbitrary code to be executed with the privileges of the running guacd process.

For Debian 9 stretch, these problems have been fixed in version 0.9.9-2+deb9u1.

We recommend that you upgrade your guacamole-server packages.

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

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 packages.

See Also

https://lists.debian.org/debian-lts-announce/2020/11/msg00010.html

https://packages.debian.org/source/stretch/guacamole-server

http://www.nessus.org/u?7763c5e7

Plugin Details

Severity: Medium

ID: 142632

File Name: debian_DLA-2435.nasl

Version: 1.3

Type: local

Agent: unix

Published: 11/9/2020

Updated: 11/20/2020

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

Risk Information

VPR

Risk Factor: Medium

Score: 5.9

CVSS v2

Risk Factor: Medium

Base Score: 6.2

Temporal Score: 4.6

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

CVSS Score Source: CVE-2020-9498

CVSS v3

Risk Factor: Medium

Base Score: 6.7

Temporal Score: 5.8

Vector: CVSS:3.0/AV:L/AC:H/PR:L/UI:R/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:libguac-client-telnet0, p-cpe:/a:debian:debian_linux:libguac-dev, p-cpe:/a:debian:debian_linux:libguac-client-vnc0, p-cpe:/a:debian:debian_linux:libguac11, p-cpe:/a:debian:debian_linux:guacd, p-cpe:/a:debian:debian_linux:libguac-client-ssh0, cpe:/o:debian:debian_linux:9.0, p-cpe:/a:debian:debian_linux:libguac-client-rdp0

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

Exploit Ease: No known exploits are available

Patch Publication Date: 11/6/2020

Vulnerability Publication Date: 7/2/2020

Reference Information

CVE: CVE-2020-9497, CVE-2020-9498