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Test ID:1.3.6.1.4.1.25623.1.0.844508
Category:Ubuntu Local Security Checks
Title:Ubuntu: Security Advisory for libvncserver (USN-4434-1)
Summary:The remote host is missing an update for the 'libvncserver'; package(s) announced via the USN-4434-1 advisory.
Description:Summary:
The remote host is missing an update for the 'libvncserver'
package(s) announced via the USN-4434-1 advisory.

Vulnerability Insight:
Ramin Farajpour Cami discovered that LibVNCServer incorrectly handled
certain malformed unix socket names. A remote attacker could exploit this
with a crafted socket name, leading to a denial of service, or possibly
execute arbitrary code. (CVE-2019-20839)

It was discovered that LibVNCServer did not properly access byte-aligned
data. A remote attacker could possibly use this issue to cause
LibVNCServer to crash, resulting in a denial of service. This issue only
affected Ubuntu 18.04 LTS and Ubuntu 16.04 LTS. (CVE-2019-20840)

Christian Beier discovered that LibVNCServer incorrectly handled anonymous
TLS connections. A remote attacker could possibly use this issue to cause
LibVNCServer to crash, resulting in a denial of service. This issue only
affected Ubuntu 20.04 LTS. (CVE-2020-14396)

It was discovered that LibVNCServer incorrectly handled region clipping. A
remote attacker could possibly use this issue to cause LibVNCServer to
crash, resulting in a denial of service. (CVE-2020-14397)

It was discovered that LibVNCServer did not properly reset incorrectly
terminated TCP connections. A remote attacker could possibly use this
issue to cause an infinite loop, resulting in a denial of service.
(CVE-2020-14398)

It was discovered that LibVNCServer did not properly access byte-aligned
data. A remote attacker could possibly use this issue to cause
LibVNCServer to crash, resulting in a denial of service. (CVE-2020-14399,
CVE-2020-14400)

It was discovered that LibVNCServer incorrectly handled screen scaling on
the server side. A remote attacker could use this issue to cause
LibVNCServer to crash, resulting in a denial of service, or possibly
execute arbitrary code. (CVE-2020-14401)

It was discovered that LibVNCServer incorrectly handled encodings. A
remote attacker could use this issue to cause LibVNCServer to crash,
resulting in a denial of service, or possibly execute arbitrary code.
(CVE-2020-14402, CVE-2020-14403, CVE-2020-14404)

It was discovered that LibVNCServer incorrectly handled TextChat messages.
A remote attacker could possibly use this issue to cause LibVNCServer to
crash, resulting in a denial of service. (CVE-2020-14405)

Affected Software/OS:
'libvncserver' package(s) on Ubuntu 20.04 LTS, Ubuntu 18.04 LTS, Ubuntu 16.04 LTS.

Solution:
Please install the updated package(s).

CVSS Score:
6.4

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

Cross-Ref: Common Vulnerability Exposure (CVE) ID: CVE-2019-20839
Common Vulnerability Exposure (CVE) ID: CVE-2019-20840
Common Vulnerability Exposure (CVE) ID: CVE-2020-14396
Common Vulnerability Exposure (CVE) ID: CVE-2020-14397
Common Vulnerability Exposure (CVE) ID: CVE-2020-14398
Common Vulnerability Exposure (CVE) ID: CVE-2020-14399
Common Vulnerability Exposure (CVE) ID: CVE-2020-14400
Common Vulnerability Exposure (CVE) ID: CVE-2020-14401
Common Vulnerability Exposure (CVE) ID: CVE-2020-14402
Common Vulnerability Exposure (CVE) ID: CVE-2020-14403
Common Vulnerability Exposure (CVE) ID: CVE-2020-14404
Common Vulnerability Exposure (CVE) ID: CVE-2020-14405
CopyrightCopyright (C) 2020 Greenbone Networks GmbH

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