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CVE-2016-9942

Published: 31 December 2016

Heap-based buffer overflow in ultra.c in LibVNCClient in LibVNCServer before 0.9.11 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.

Priority

Medium

Cvss 3 Severity Score

9.8

Score breakdown

Status

Package Release Status
italc
Launchpad, Ubuntu, Debian
bionic
Released (1:3.0.1+dfsg1-1)
focal Does not exist

trusty Does not exist
(trusty was needed)
upstream
Released (1:3.0.3+dfsg1-1+deb9u1, 1:2.0.2+dfsg1-2+deb8u1)
xenial
Released (1:2.0.2+dfsg1-4ubuntu0.1)
libvncserver
Launchpad, Ubuntu, Debian
trusty
Released (0.9.9+dfsg-1ubuntu1.2)
upstream
Released (0.9.11)
xenial
Released (0.9.10+dfsg-3ubuntu0.16.04.1)
yakkety
Released (0.9.10+dfsg-3ubuntu0.16.10.1)
precise
Released (0.9.8.2-2ubuntu1.2)
Patches:
upstream: https://github.com/LibVNC/libvncserver/commit/5fff4353f66427b467eb29e5fdc1da4f2be028bb

Severity score breakdown

Parameter Value
Base score 9.8
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Scope Unchanged
Confidentiality High
Integrity impact High
Availability impact High
Vector CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H