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Bug 1410168 - (CVE-2016-9942) CVE-2016-9942 libvncserver: Heap-based buffer overflow in ultra.c
CVE-2016-9942 libvncserver: Heap-based buffer overflow in ultra.c
Status: CLOSED WONTFIX
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
unspecified
All Linux
medium Severity medium
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Assigned To: Red Hat Product Security
impact=moderate,public=20161114,repor...
: Security
Depends On: 1410180 1410178 1410179
Blocks: 1410176
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Reported: 2017-01-04 11:17 EST by Adam Mariš
Modified: 2017-05-25 23:54 EDT (History)
5 users (show)

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Fixed In Version: libvncserver 0.9.11
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Last Closed: 2017-01-24 02:08:12 EST
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Description Adam Mariš 2017-01-04 11:17:31 EST 
Heap-based buffer overflow was found in ultra.c in LibVNCClient in LibVNCServer before 0.9.11 that allows remote servers to cause a denial of service (application crash) or possibly execute arbitrary code via a crafted FramebufferUpdate message with the Ultra type tile, such that the LZO payload decompressed length exceeds what is specified by the tile dimensions.

Upstream patch:

https://github.com/LibVNC/libvncserver/commit/5fff4353f66427b467eb29e5fdc1da4f2be028bb

Upstream bug:

https://github.com/LibVNC/libvncserver/pull/137
Comment 1 Adam Mariš 2017-01-04 11:41:26 EST 
Created libvncserver tracking bugs for this issue:

Affects: fedora-all [bug 1410178]
Affects: epel-5 [bug 1410179]
Affects: epel-7 [bug 1410180]
Comment 3 Fedora Update System 2017-05-25 23:54:41 EDT 
libvncserver-0.9.11-2.fc24.1 has been pushed to the Fedora 24 stable repository. If problems still persist, please make note of it in this bug report.
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