Advisory Published

USN-4407-1: LibVNCServer vulnerabilities

First published: Wed Jul 01 2020(Updated: )

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 SoftwareAffected VersionHow to fix
All of
ubuntu/libvncclient1<0.9.12+dfsg-9ubuntu0.1
0.9.12+dfsg-9ubuntu0.1
=20.04
All of
ubuntu/libvncserver1<0.9.12+dfsg-9ubuntu0.1
0.9.12+dfsg-9ubuntu0.1
=20.04
All of
ubuntu/libvncclient1<0.9.11+dfsg-1.3ubuntu0.1
0.9.11+dfsg-1.3ubuntu0.1
=19.10
All of
ubuntu/libvncserver1<0.9.11+dfsg-1.3ubuntu0.1
0.9.11+dfsg-1.3ubuntu0.1
=19.10
All of
ubuntu/libvncclient1<0.9.11+dfsg-1ubuntu1.2
0.9.11+dfsg-1ubuntu1.2
=18.04
All of
ubuntu/libvncserver1<0.9.11+dfsg-1ubuntu1.2
0.9.11+dfsg-1ubuntu1.2
=18.04
All of
ubuntu/libvncclient1<0.9.10+dfsg-3ubuntu0.16.04.4
0.9.10+dfsg-3ubuntu0.16.04.4
=16.04
All of
ubuntu/libvncserver1<0.9.10+dfsg-3ubuntu0.16.04.4
0.9.10+dfsg-3ubuntu0.16.04.4
=16.04

Never miss a vulnerability like this again

Sign up to SecAlerts for real-time vulnerability data matched to your software, aggregated from hundreds of sources.

Read MoreStart Free Trial

Reference Links

Child vulnerabilities

(Contains the following vulnerabilities)

Frequently Asked Questions

  • What is the severity of USN-4407-1?

    The severity of USN-4407-1 is moderate.

  • How does LibVNCServer handle decompressing data in USN-4407-1?

    LibVNCServer incorrectly handles decompressing data in USN-4407-1.

  • What is the impact of the vulnerability CVE-2019-15680 in USN-4407-1?

    The vulnerability CVE-2019-15680 can cause LibVNCServer to crash, resulting in a denial of service.

  • What is the remedy for the vulnerability in libvncclient1 in USN-4407-1?

    The remedy for the vulnerability in libvncclient1 in USN-4407-1 is to update to version 0.9.12+dfsg-9ubuntu0.1 or later.

  • Where can I find more information about USN-4407-1?

    You can find more information about USN-4407-1 on the Ubuntu Security website.

Company

Resources

Contact

SecAlerts Pty Ltd.
132 Wickham Terrace
Fortitude Valley,
QLD 4006, Australia
info@secalerts.co
By using SecAlerts services, you agree to our services end-user license agreement. This website is safeguarded by reCAPTCHA and governed by the Google Privacy Policy and Terms of Service. All names, logos, and brands of products are owned by their respective owners, and any usage of these names, logos, and brands for identification purposes only does not imply endorsement. If you possess any content that requires removal, please get in touch with us.
© 2024 SecAlerts Pty Ltd.
ABN: 70 645 966 203, ACN: 645 966 203