PT-2019-5276 · Ultravnc · Ultravnc

Published 2019-03-01 · Updated 2020-10-19 · CVE-2019-8271

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 versions prior to revision 1212

Description The issue is related to a heap buffer overflow in the VNC server code, specifically within the file transfer handler. This can potentially allow a remote attacker to execute arbitrary code. The exploitation of this issue is possible via network connectivity.

Recommendations For UltraVNC versions prior to revision 1212, update to revision 1212 or later to resolve the issue. As a temporary workaround, consider restricting network connectivity to the VNC server to minimize the risk of exploitation.

Fix

Buffer Overflow

Memory Corruption

Heap Based Buffer Overflow

Weakness Enumeration

CWE-119

CWE-787

CWE-122

Related Identifiers

BDU:2020-02173

CVE-2019-8271

Affected Products

Ultravnc

References · 8

• https://bdu.fstec.ru/vul/2020-02173 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2019-8271 · Security Note
• https://osv.dev/vulnerability/CVE-2019-8271 · Vendor Advisory
• 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://ics-cert.kaspersky.com/advisories/klcert-advisories/2019/03/01/klcert-19-018-ultravnc-heap-based-buffer-overflow · 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