PT-2019-4935 · Ultravnc · Ultravnc

Published 2019-03-05 · Updated 2021-06-28 · CVE-2019-8261

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 1199

Description The issue is related to an out-of-bounds read in the VNC code inside the client CoRRE decoder, caused by a multiplication overflow. This can be exploited via network connectivity, potentially allowing a remote attacker to execute arbitrary code.

Recommendations For UltraVNC revision 1199, update to revision 1200 to resolve the issue. As a temporary workaround, consider restricting network connectivity to minimize the risk of exploitation.

Fix

Out of bounds Read

Weakness Enumeration

CWE-125

Related Identifiers

BDU:2020-01543

CVE-2019-8261

Affected Products

Ultravnc

References · 11

• https://nvd.nist.gov/vuln/detail/CVE-2019-8261 · Security Note
• https://osv.dev/vulnerability/CVE-2019-8261 · Vendor Advisory
• https://bdu.fstec.ru/vul/2020-01543 · Security Note
• https://cert-portal.siemens.com/productcert/pdf/ssa-286838.pdf · Note
• https://us-cert.cisa.gov/ics/advisories/icsa-21-131-11 · Note
• https://cert-portal.siemens.com/productcert/pdf/ssa-940818.pdf · Note
• https://ics-cert.kaspersky.com/advisories/klcert-advisories/2019/03/01/klcert-19-007-ultravnc-out-of-bound-read · 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