Vulnerability Name:

CVE-2020-14396 (CCN-183909)

Assigned:2020-05-27
Published:2020-05-27
Updated:2022-03-10
Summary:An issue was discovered in LibVNCServer before 0.9.13. libvncclient/tls_openssl.c has a NULL pointer dereference.
CVSS v3 Severity:7.5 High (CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
6.5 Medium (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C)
Exploitability Metrics:Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): None
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): High
7.5 High (CCN CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
6.5 Medium (CCN Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C)
Exploitability Metrics:Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): None
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): High
CVSS v2 Severity:5.0 Medium (CVSS v2 Vector: AV:N/AC:L/Au:N/C:N/I:N/A:P)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Low
Authentication (Au): None
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): Partial
7.8 High (CCN CVSS v2 Vector: AV:N/AC:L/Au:N/C:N/I:N/A:C)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Low
Athentication (Au): None
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): Complete
Vulnerability Type:CWE-476
Vulnerability Consequences:Denial of Service
References:Source: MITRE
Type: CNA
CVE-2020-14396

Source: CONFIRM
Type: Patch, Third Party Advisory
https://cert-portal.siemens.com/productcert/pdf/ssa-390195.pdf

Source: XF
Type: UNKNOWN
libvncserver-cve202014396-dos(183909)

Source: CCN
Type: LibVNCServer GIT Repository
libvncserver

Source: MISC
Type: Patch, Third Party Advisory
https://github.com/LibVNC/libvncserver/commit/33441d90a506d5f3ae9388f2752901227e430553

Source: CCN
Type: LibVNCServer GIT Repository
libvncserver: add missing NULL pointer checks

Source: CCN
Type: LibVNCServer GIT Repository
LibVNCServer

Source: MISC
Type: Release Notes, Third Party Advisory
https://github.com/LibVNC/libvncserver/compare/LibVNCServer-0.9.12...LibVNCServer-0.9.13

Source: UBUNTU
Type: Third Party Advisory
USN-4434-1

Vulnerable Configuration:Configuration 1:
  • cpe:/a:libvnc_project:libvncserver:*:*:*:*:*:*:*:* (Version <= 0.9.12)

    • Configuration 2:
  • cpe:/o:canonical:ubuntu_linux:14.04:*:*:*:lts:*:*:*
  • OR cpe:/o:canonical:ubuntu_linux:16.04:*:*:*:esm:*:*:*
  • OR cpe:/o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:*
  • OR cpe:/o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*
  • OR cpe:/o:canonical:ubuntu_linux:18.10:*:*:*:*:*:*:*
  • OR cpe:/o:canonical:ubuntu_linux:20.04:*:*:*:lts:*:*:*

    • Configuration 3:
  • cpe:/o:debian:debian_linux:8.0:*:*:*:*:*:*:*
  • OR cpe:/o:debian:debian_linux:9.0:*:*:*:*:*:*:*

    • Configuration 4:
  • cpe:/o:siemens:simatic_itc1500_firmware:*:*:*:*:*:*:*:* (Version >= 3.0.0.0 and < 3.2.1.0)
  • AND
  • cpe:/h:siemens:simatic_itc1500:-:*:*:*:*:*:*:*

    • Configuration 5:
  • cpe:/o:siemens:simatic_itc1500_pro_firmware:*:*:*:*:*:*:*:* (Version >= 3.0.0.0 and < 3.2.1.0)
  • AND
  • cpe:/h:siemens:simatic_itc1500_pro:-:*:*:*:*:*:*:*

    • Configuration 6:
  • cpe:/o:siemens:simatic_itc1900_firmware:*:*:*:*:*:*:*:* (Version >= 3.0.0.0 and < 3.2.1.0)
  • AND
  • cpe:/h:siemens:simatic_itc1900:-:*:*:*:*:*:*:*

    • Configuration 7:
  • cpe:/o:siemens:simatic_itc1900_pro_firmware:*:*:*:*:*:*:*:* (Version >= 3.0.0.0 and < 3.2.1.0)
  • AND
  • cpe:/h:siemens:simatic_itc1900_pro:-:*:*:*:*:*:*:*

    • Configuration 8:
  • cpe:/o:siemens:simatic_itc2200_firmware:*:*:*:*:*:*:*:* (Version >= 3.0.0.0 and < 3.2.1.0)
  • AND
  • cpe:/h:siemens:simatic_itc2200:-:*:*:*:*:*:*:*

    • Configuration 9:
  • cpe:/o:siemens:simatic_itc2200_pro_firmware:*:*:*:*:*:*:*:* (Version >= 3.0.0.0 and < 3.2.1.0)
  • AND
  • cpe:/h:siemens:simatic_itc2200_pro:-:*:*:*:*:*:*:*

    • Configuration CCN 1:
  • cpe:/a:libvncserver:libvncserver:0.9.9:*:*:*:*:*:*:*
  • OR cpe:/a:libvncserver_project:libvncserver:0.9.10:*:*:*:*:*:*:*
  • OR cpe:/a:libvncserver_project:libvncserver:0.9.11:*:*:*:*:*:*:*
  • OR cpe:/a:libvnc_project:libvncserver:0.9.12:-:*:*:*:*:*:*

    • * Denotes that component is vulnerable
    BACK
    libvnc_project libvncserver *
    canonical ubuntu linux 14.04
    canonical ubuntu linux 16.04
    canonical ubuntu linux 16.04
    canonical ubuntu linux 18.04
    canonical ubuntu linux 18.10
    canonical ubuntu linux 20.04
    debian debian linux 8.0
    debian debian linux 9.0
    siemens simatic itc1500 firmware *
    siemens simatic itc1500 -
    siemens simatic itc1500 pro firmware *
    siemens simatic itc1500 pro -
    siemens simatic itc1900 firmware *
    siemens simatic itc1900 -
    siemens simatic itc1900 pro firmware *
    siemens simatic itc1900 pro -
    siemens simatic itc2200 firmware *
    siemens simatic itc2200 -
    siemens simatic itc2200 pro firmware *
    siemens simatic itc2200 pro -
    libvncserver libvncserver 0.9.9
    libvncserver_project libvncserver 0.9.10
    libvncserver_project libvncserver 0.9.11
    libvnc_project libvncserver 0.9.12 -