CVE-2016-9942

Publication date 31 December 2016

Last updated 25 August 2025

Ubuntu priority

Medium

Why this priority?

Cvss 3 Severity Score

9.8 · Critical

Score breakdown

Description

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.

Status

Package Ubuntu Release Status
italc 20.04 LTS focal Not in release
18.04 LTS bionic
Fixed 1:3.0.1+dfsg1-1
16.04 LTS xenial
Fixed 1:2.0.2+dfsg1-4ubuntu0.1
14.04 LTS trusty Not in release
libvncserver 16.10 yakkety
Fixed 0.9.10+dfsg-3ubuntu0.16.10.1
16.04 LTS xenial
Fixed 0.9.10+dfsg-3ubuntu0.16.04.1
14.04 LTS trusty
Fixed 0.9.9+dfsg-1ubuntu1.2
12.04 LTS precise
Fixed 0.9.8.2-2ubuntu1.2

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package Patch details
libvncserver

Severity score breakdown

Parameter Value
Base score 9.8 · Critical
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

References

Related Ubuntu Security Notices (USN)

    • USN-3171-1
    • LibVNCServer vulnerabilities
    • 11 January 2017
    • USN-4587-1
    • iTALC vulnerabilities
    • 20 October 2020

Other references