CVE-2018-20023

Publication date 19 December 2018

Last updated 24 July 2024

Ubuntu priority

Cvss 3 Severity Score

LibVNC before 8b06f835e259652b0ff026898014fc7297ade858 contains CWE-665: Improper Initialization vulnerability in VNC Repeater client code that allows attacker to read stack memory and can be abuse for information disclosure. Combined with another vulnerability, it can be used to leak stack memory layout and in bypassing ASLR

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 end of life
	18.04 LTS bionic	Not affected
	16.04 LTS xenial	Not affected
	14.04 LTS trusty	Not affected

Patch details

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

Package	Patch details
libvncserver	Upstream: 8b06f83

Severity score breakdown

Parameter	Value
Base score	7.5 · High
Attack vector	Network
Attack complexity	Low
Privileges required	None
User interaction	None
Scope	Unchanged
Confidentiality	High
Integrity impact	None
Availability impact	None
Vector	CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

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