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Ubuntu Security Notice USN-4547-2
September 28, 2020

ssvnc vulnerabilities
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A security issue affects these releases of Ubuntu and its derivatives:

– Ubuntu 16.04 LTS

Summary:

Several security issues were fixed in SSVNC.

Software Description:
– 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)

Update instructions:

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

Ubuntu 16.04 LTS:
ssvnc 1.0.29-2+deb8u1build0.16.04.1

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

References:
https://usn.ubuntu.com/4547-2
https://usn.ubuntu.com/4547-1
CVE-2018-20020, CVE-2018-20021, CVE-2018-20022, CVE-2018-20024

Package Information:
https://launchpad.net/ubuntu/+source/ssvnc/1.0.29-2+deb8u1build0.16.04.1

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