PT-2019-5277 · Ultravnc · Ultravnc

Published 2019-03-01 · Updated 2020-10-19 · CVE-2019-8268

Positive Technologies (AI Summary)

CVSS v2.0

10

Critical

Base vector

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

Name of the Vulnerable Software and Affected Versions UltraVNC revision 1206

Description The issue is related to off-by-one vulnerabilities in the VNC client code of UltraVNC, specifically with the improper usage of the ClientConnection::ReadString function. This can potentially result in code execution. The attack is exploitable via network connectivity.

Recommendations For UltraVNC revision 1206, update to revision 1207 to resolve the issue. As a temporary workaround, consider restricting network connectivity to minimize the risk of exploitation.

Fix

Weakness Enumeration

CWE-193

CWE-682

Related Identifiers

BDU:2020-02174

CVE-2019-8268

Affected Products

Ultravnc

References · 8

• https://osv.dev/vulnerability/CVE-2019-8268 · Vendor Advisory
• https://bdu.fstec.ru/vul/2020-02174 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2019-8268 · Security Note
• https://ics-cert.kaspersky.com/advisories/klcert-advisories/2019/03/01/klcert-19-015-ultravnc-off-by-one-error · Note
• https://us-cert.gov/ics/advisories/icsa-20-161-06 · Note
• https://download.schneider-electric.com/files?p_enDocType=Technical+leaflet&p_File_Name=SEVD-2019-225-05-TelevisGO_Security_Notification.pdf&p_Doc_Ref=SEVD-2019-225-05 · Note
• https://download.schneider-electric.com/files?p_enDocType=Technical+leaflet&p_File_Name=SEVD-2019-225-05-TelevisGO_Security_Notification.pdf&p_Doc_Ref=SEVD-2019-225-05 · Note
• https://cert-portal.siemens.com/productcert/pdf/ssa-927095.pdf · Note