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USN-4547-2: SSVNC vulnerabilities

28 September 2020

Several security issues were fixed in SSVNC.

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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)

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Ubuntu Pro provides ten-year security coverage to 25,000+ packages in Main and Universe repositories, and it is free for up to five machines.

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Update instructions

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

Ubuntu 16.04

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

References

Related notices

  • USN-3877-1: libvncserver-config, linuxvnc, libvncserver-dev, libvncserver0, libvncserver1, libvncserver, libvncclient1
  • USN-4547-1: libitalccore, italc, italc-client, italc-master
  • USN-4587-1: libitalccore, italc-master, italc-management-console, italc-client, italc

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Further reading