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CVE-2018-20023

Publication date 19 December 2018

Last updated 24 July 2024


Ubuntu priority

Cvss 3 Severity Score

7.5 · High

Score breakdown

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

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

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

Other references