Debian LTS Advisory ([SECURITY] [DLA 2016-1] ssvnc security update)

Published: 2019-11-30 03:00:14
CVE Author: NIST National Vulnerability Database

CVSS Base Vector:
AV:N/AC:L/Au:N/C:N/I:N/A:C

Summary:
The remote host is missing an update for the 'ssvnc' Linux Distribution Package(s) announced via the DSA-2016-1 advisory.

Detection Method:
Checks if a vulnerable Linux Distribution Package version is present on the target host.

Technical Details:
Several vulnerabilities have been identified in the VNC code of ssvnc, an encryption-capable VNC client.. The vulnerabilities referenced below are issues that have originally been reported against Debian source Linux Distribution Package libvncserver (which also ships the libvncclient shared library). The ssvnc source Linux Distribution Package in Debian ships a custom-patched, stripped down and outdated variant of libvncclient, thus some of libvncclient's security fixes required porting over. CVE-2018-20020 LibVNC contained heap out-of-bound write vulnerability inside structure in VNC client code that can result remote code execution CVE-2018-20021 LibVNC contained a CWE-835: Infinite loop vulnerability in VNC client code. Vulnerability allows attacker to consume excessive amount of resources like CPU and RAM CVE-2018-20022 LibVNC contained multiple weaknesses CWE-665: Improper Initialization vulnerability in VNC client code that allowed attackers to read stack memory and could be abused for information disclosure. Combined with another vulnerability, it could be used to leak stack memory layout and in bypassing ASLR. CVE-2018-20024 LibVNC contained null pointer dereference in VNC client code that could result DoS.

Affected Versions:
'ssvnc' Linux Distribution Package(s) on Debian Linux.

Recommendations:
For Debian 8 'Jessie', these problems have been fixed in version 1.0.29-2+deb8u1. We recommend that you upgrade your ssvnc Linux Distribution Packages.

Solution Type:
Vendor Patch

Detection Type:
Linux Distribution Package

NIST (National Institute of Standards and Technology) NVD (National Vulnerability Database)

https://nvd.nist.gov/vuln/detail/CVE-2018-20020
https://nvd.nist.gov/vuln/detail/CVE-2018-20021
https://nvd.nist.gov/vuln/detail/CVE-2018-20022
https://nvd.nist.gov/vuln/detail/CVE-2018-20024

References:

https://lists.debian.org/debian-lts-announce/2019/11/msg00033.html
https://security-tracker.debian.org/tracker/DLA-2016-1
https://bugs.debian.org/945827

Severity
High
CVSS Score
7.8
Published
2019-11-30
Modified
2019-11-30
Category
Debian Local Security Checks

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