Bug 1661114 (CVE-2018-20019) - CVE-2018-20019 libvncserver: Multiple heap out-of-bound writes in VNC client code
Summary: CVE-2018-20019 libvncserver: Multiple heap out-of-bound writes in VNC client ...
Keywords:
Status: CLOSED ERRATA
Alias: CVE-2018-20019
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 1661115 1661116 1663003 1663007 1671409 1671410
Blocks: 1661105
TreeView+ depends on / blocked
 
Reported: 2018-12-20 07:03 UTC by Sam Fowler
Modified: 2021-10-25 22:22 UTC (History)
3 users (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed: 2021-10-25 22:22:22 UTC
Embargoed:

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Description Sam Fowler 2018-12-20 07:03:09 UTC 
LibVNC before commit a83439b9fbe0f03c48eb94ed05729cb016f8b72f contains multiple heap out-of-bound write vulnerabilities in VNC client code, which can result in remote code execution. This attack appears to be exploitable via network connectivity. This vulnerability has been fixed in a83439b9fbe0f03c48eb94ed05729cb016f8b72f and later.


External Reference:

https://ics-cert.kaspersky.com/advisories/klcert-advisories/2018/12/19/klcert-18-029-libvnc-multiple-heap-out-of-bound-vulnerabilities/


Upstream Patch:

https://github.com/LibVNC/libvncserver/commit/a83439b9fbe0f03c48eb94ed05729cb016f8b72f
Comment 1 Sam Fowler 2018-12-20 07:03:25 UTC 
Created libvncserver tracking bugs for this issue:

Affects: epel-7 [bug 1661116]
Affects: fedora-all [bug 1661115]
Comment 2 Sam Fowler 2018-12-20 07:32:42 UTC 
Upstream Issue:

https://github.com/LibVNC/libvncserver/issues/247
Comment 3 Stefan Cornelius 2018-12-21 11:44:56 UTC 
Upstream patch is most likely problematic, for the same reasons as given in https://github.com/LibVNC/libvncserver/issues/273
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