CVE-2018-20019

Publication date 19 December 2018

Last updated 24 July 2024

Ubuntu priority

Cvss 3 Severity Score

LibVNC before commit a83439b9fbe0f03c48eb94ed05729cb016f8b72f contains multiple heap out-of-bound write vulnerabilities in VNC client code that can result remote code execution

Read the notes from the security team

Status

Show unmaintained releases

Package	Ubuntu Release	Status
italc	20.04 LTS focal	Not in release
	18.04 LTS bionic	Fixed 1:3.0.3+dfsg1-3ubuntu0.1
	16.04 LTS xenial	Fixed 1:2.0.2+dfsg1-4ubuntu0.1
	14.04 LTS trusty	Not in release
libvncserver	20.04 LTS focal	Not affected
	19.04 disco	Not affected
	18.10 cosmic	Fixed 0.9.11+dfsg-1.1ubuntu0.1
	18.04 LTS bionic	Fixed 0.9.11+dfsg-1ubuntu1.1
	16.04 LTS xenial	Fixed 0.9.10+dfsg-3ubuntu0.16.04.3
	14.04 LTS trusty	Fixed 0.9.9+dfsg-1ubuntu1.4
x11vnc	20.04 LTS focal	Not affected
	19.04 disco	Not affected
	18.10 cosmic	Ignored
	18.04 LTS bionic	Not affected
	16.04 LTS xenial	Not affected
	14.04 LTS trusty	Not affected

Notes

mdeslaur

original upstream patch for this issue was incomplete. See CVE-2018-20748 for more fixes.

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package	Patch details
libvncserver	Upstream: a83439b

Severity score breakdown

Parameter	Value
Base score	9.8 · Critical
Attack vector	Network
Attack complexity	Low
Privileges required	None
User interaction	None
Scope	Unchanged
Confidentiality	High
Integrity impact	High
Availability impact	High
Vector	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References

Related Ubuntu Security Notices (USN)

USN-3877-1
LibVNCServer vulnerabilities
31 January 2019

USN-4547-1
iTALC vulnerabilities
28 September 2020

USN-4587-1
iTALC vulnerabilities
20 October 2020