PT-2019-5436 · Libvnc+3 · Libvncserver+3

Christian Beier · Published 2019-12-18 · Updated 2022-03-10 · CVE-2020-14396

Positive Technologies (AI Summary)

CVSS v2.0

7.8

High

Base vector

AV:N/AC:L/Au:N/C:N/I:N/A:C

Name of the Vulnerable Software and Affected Versions LibVNCServer versions prior to 0.9.13

Description An issue in libvncclient/tls openssl.c of LibVNCServer is related to pointer dereference errors, which can lead to a denial of service. A remote attacker may exploit this issue to cause a service disruption.

Recommendations For versions prior to 0.9.13, update to version 0.9.13 or later to resolve the issue. As a temporary workaround, consider restricting access to the libvncclient/tls openssl.c component until a patch is available.

Fix

NULL Pointer Dereference

Weakness Enumeration

CWE-476

Related Identifiers

ALT-PU-2020-2671

ALT-PU-2020-2694

BDU:2020-03156

CVE-2020-14396

USN-4434-1

Affected Products

Alt Linux

Libvncserver

Linuxmint

Ubuntu

References · 28

• https://github.com/LibVNC/libvncserver/commit/33441d90a506d5f3ae9388f2752901227e430553 · Patch
• https://ubuntu.com/security/CVE-2020-14396 · Vendor Advisory
• https://bdu.fstec.ru/vul/2020-03156 · Security Note
• https://ubuntu.com/security/CVE-2020-14401 · Vendor Advisory
• https://ubuntu.com/security/CVE-2020-14402 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2020-14396 · Vendor Advisory
• https://osv.dev/vulnerability/USN-4434-1 · Vendor Advisory
• https://ubuntu.com/security/CVE-2020-14400 · Vendor Advisory
• https://ubuntu.com/security/CVE-2020-14399 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2020-14396 · Security Note
• https://osv.dev/vulnerability/DEBIAN-CVE-2020-14396 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2020-14396 · Vendor Advisory
• https://ubuntu.com/security/CVE-2019-20840 · Vendor Advisory
• https://ubuntu.com/security/CVE-2020-14405 · Vendor Advisory
• https://cert-portal.siemens.com/productcert/pdf/ssa-390195.pdf · Patch