Bug 1661136 (CVE-2018-6307) - CVE-2018-6307 libvncserver: Use-after-free in file transfer extension server code allows for potential code execution
Summary: CVE-2018-6307 libvncserver: Use-after-free in file transfer extension server ...
Keywords:
Status: CLOSED NOTABUG
Alias: CVE-2018-6307
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 1661137 1661138
Blocks: 1661105
TreeView+ depends on / blocked
 
Reported: 2018-12-20 07:23 UTC by Sam Fowler
Modified: 2021-02-16 22:37 UTC (History)
3 users (show)

Fixed In Version:
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Environment:
Last Closed: 2018-12-21 10:42:31 UTC


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Description Sam Fowler 2018-12-20 07:23:13 UTC
LibVNC before commit ca2a5ac02fbbadd0a21fabba779c1ea69173d10b contains heap use-after-free vulnerability in server code of file transfer extension that can result remote code execution.


External Reference:

https://ics-cert.kaspersky.com/advisories/klcert-advisories/2018/12/19/klcert-18-026-libvnc-heap-use-after-free/


Upstream Patch:

https://github.com/LibVNC/libvncserver/commit/ca2a5ac02fbbadd0a21fabba779c1ea69173d10b

Comment 1 Sam Fowler 2018-12-20 07:23:26 UTC
Created libvncserver tracking bugs for this issue:

Affects: epel-7 [bug 1661138]
Affects: fedora-all [bug 1661137]

Comment 2 Sam Fowler 2018-12-20 07:33:50 UTC
Upstream Issue:

https://github.com/LibVNC/libvncserver/issues/241

Comment 3 Sam Fowler 2018-12-20 08:02:04 UTC
Reference:

https://seclists.org/oss-sec/2018/q4/212

Comment 4 Stefan Cornelius 2018-12-21 10:42:33 UTC
Statement:

This issue did not affect the versions of libvncserver as shipped with Red Hat Enterprise Linux 6 and 7, as they did not include support for tightvnc file transfer.


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