Bug 1661128 (CVE-2018-20023)

Summary: CVE-2018-20023 libvncserver: Improper initialization in VNC Repeater client code allows for information disclosure
Product: [Other] Security Response Reporter: Sam Fowler <sfowler>
Component: vulnerabilityAssignee: Red Hat Product Security <security-response-team>
Status: CLOSED WONTFIX QA Contact:
Severity: low Docs Contact:
Priority: low    
Version: unspecifiedCC: negativo17, ppisar, rdieter
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
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Last Closed: 2019-06-10 10:44:25 UTC Type: ---
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On: 1661129, 1661130, 1663002    
Bug Blocks: 1661105    

Description Sam Fowler 2018-12-20 07:18:20 UTC
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


External Reference:

https://ics-cert.kaspersky.com/advisories/klcert-advisories/2018/12/19/klcert-18-033-libvnc-memory-leak/


Upstream Patch:

https://github.com/LibVNC/libvncserver/commit/8b06f835e259652b0ff026898014fc7297ade858

Comment 1 Sam Fowler 2018-12-20 07:18:35 UTC
Created libvncserver tracking bugs for this issue:

Affects: epel-7 [bug 1661130]
Affects: fedora-all [bug 1661129]