1. Ubuntu Security Notices
  2. USN-4547-2

USN-4547-2: SSVNC vulnerabilities

Publication date

28 September 2020

Overview

Several security issues were fixed in SSVNC.

Releases

Packages

  • ssvnc - Enhanced TightVNC viewer with SSL/SSH tunnel helper

Details

It was discovered that the LibVNCClient vendored in SSVNC incorrectly handled
certain packet lengths. A remote attacker could possibly use this issue to
obtain sensitive information, cause a denial of service, or execute arbitrary
code. (CVE-2018-20020, CVE-2018-20021, CVE-2018-20022, CVE-2018-2024)

It was discovered that the LibVNCClient vendored in SSVNC incorrectly handled
certain packet lengths. A remote attacker could possibly use this issue to
obtain sensitive information, cause a denial of service, or execute arbitrary
code. (CVE-2018-20020, CVE-2018-20021, CVE-2018-20022, CVE-2018-2024)

Update instructions

In general, a standard system update will make all the necessary changes.

Learn more about how to get the fixes.

The problem can be corrected by updating your system to the following package versions:

Ubuntu Release Package Version
16.04 xenial ssvnc –  1.0.29-2+deb8u1build0.16.04.1

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References

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