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Test ID:1.3.6.1.4.1.25623.1.0.844487
Category:Ubuntu Local Security Checks
Title:Ubuntu: Security Advisory for libvncserver (USN-4407-1)
Summary:The remote host is missing an update for the 'libvncserver'; package(s) announced via the USN-4407-1 advisory.
Description:Summary:
The remote host is missing an update for the 'libvncserver'
package(s) announced via the USN-4407-1 advisory.

Vulnerability Insight:
It was discovered that LibVNCServer incorrectly handled decompressing
data. An
attacker could possibly use this issue to cause LibVNCServer to crash,
resulting in a denial of service. (CVE-2019-15680)

It was discovered that an information disclosure vulnerability existed in
LibVNCServer when sending a ServerCutText message. An attacker could
possibly
use this issue to expose sensitive information. This issue only affected
Ubuntu 19.10, Ubuntu 18.04 LTS, and Ubuntu 16.04 LTS. (CVE-2019-15681)

It was discovered that LibVNCServer incorrectly handled cursor shape
updates.
If a user were tricked in to connecting to a malicious server, an attacker
could possibly use this issue to cause LibVNCServer to crash, resulting in a
denial of service, or possibly execute arbitrary code. This issue only
affected Ubuntu 19.10, Ubuntu 18.04 LTS, and Ubuntu 16.04 LTS.
(CVE-2019-15690, CVE-2019-20788)

It was discovered that LibVNCServer incorrectly handled decoding WebSocket
frames. An attacker could possibly use this issue to cause LibVNCServer to
crash, resulting in a denial of service, or possibly execute arbitrary code.
This issue only affected Ubuntu 19.10, Ubuntu 18.04 LTS, and Ubuntu
16.04 LTS.
(CVE-2017-18922)

Affected Software/OS:
'libvncserver' package(s) on Ubuntu 20.04 LTS, Ubuntu 19.10, Ubuntu 18.04 LTS, Ubuntu 16.04 LTS.

Solution:
Please install the updated package(s).

CVSS Score:
5.0

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

Cross-Ref: Common Vulnerability Exposure (CVE) ID: CVE-2019-15680
Common Vulnerability Exposure (CVE) ID: CVE-2019-15681
Common Vulnerability Exposure (CVE) ID: CVE-2019-15690
Common Vulnerability Exposure (CVE) ID: CVE-2019-20788
Common Vulnerability Exposure (CVE) ID: CVE-2017-18922
CopyrightCopyright (C) 2020 Greenbone Networks GmbH

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