Home/CVE/libvncclient/cursor.c in LibVNCServer through 0.9.12 has a HandleCursorShape integer overflow and heap-based buffer over
CVE

CVE-2019-20788

libvncclient/cursor.c in LibVNCServer through 0.9.12 has a HandleCursorShape integer overflow and heap-based buffer over

libvncclient/cursor.c in LibVNCServer through 0.9.12 has a HandleCursorShape integer overflow and heap-based buffer overflow via a large height or width value. NOTE: this may overlap CVE-2019-15690.

CRITICAL · CVSS 9.8 EPSS 0.00796
Act now
  • Public exploit or PoC is available
  • CVSS base score ≥ 7.0
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-190Integer Overflow or Wraparound
CWE-787Out-of-bounds Write
▤

Affected Products & Versions

9
libvnc project libvncserver<= 0.9.12
canonical ubuntu linuxall versions
debian linuxall versions
siemens simatic itc1500 firmware>= 3.0.0.0 and < 3.2.1.0
siemens simatic itc1500 pro firmware>= 3.0.0.0 and < 3.2.1.0
siemens simatic itc1900 firmware>= 3.0.0.0 and < 3.2.1.0
siemens simatic itc1900 pro firmware>= 3.0.0.0 and < 3.2.1.0
siemens simatic itc2200 firmware>= 3.0.0.0 and < 3.2.1.0
⚠

Public Exploits & PoCs

1
pocsecuritylab.github.com · GHSL-2020-064-libvnc-libvncclientsecuritylab.github.com
▣

Scoring & Timeline

9.8
CRITICAL · CVSS v3.1 · cve@mitre.org
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD23 Apr 2020 · 07:15 PM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
⚑

Vendor Advisories

12
suse-csafopenSUSE-SU-2024:10598-1
siemens-csafSSA-390195
suse-csafSUSE-SU-2020:1164-2
usnUSN-4407-1
suse-csafopenSUSE-SU-2020:0624-1
🔗

References & Sources

4
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
http://lists.opensuse.org/opensuse-security-announce/2020-05/msg00027.htmlMailing ListThird Party Advisory
https://cert-portal.siemens.com/productcert/pdf/ssa-390195.pdfPatchThird Party Advisory
https://github.com/LibVNC/libvncserver/commit/54220248886b5001fbbb9fa73c4e1a2cb9413fedPatchThird Party Advisory
https://usn.ubuntu.com/4407-1/Third Party Advisory
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