PT-2019-18956 · Ultravnc · Ultravnc

Published 2019-03-05 · Updated 2021-06-28 · CVE-2019-8259

Positive Technologies (AI Summary)

CVSS v3.1

7.5

High

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Name of the Vulnerable Software and Affected Versions UltraVNC revision 1198

Description The issue is related to multiple memory leaks in VNC client code, allowing an attacker to read stack memory, which can be used for information disclosure. When combined with another vulnerability, it can leak stack memory and bypass ASLR. This attack is exploitable via network connectivity.

Recommendations For UltraVNC revision 1198, update to revision 1199 to resolve the issue. As a temporary workaround, consider restricting network connectivity to minimize the risk of exploitation.

Fix

Memory Leak

Improper Initialization

Weakness Enumeration

CWE-401

CWE-665

Related Identifiers

CVE-2019-8259

Affected Products

Ultravnc

References · 9

• https://osv.dev/vulnerability/CVE-2019-8259 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2019-8259 · Security Note
• https://cert-portal.siemens.com/productcert/pdf/ssa-286838.pdf · Note
• https://cert-portal.siemens.com/productcert/pdf/ssa-940818.pdf · Note
• https://us-cert.cisa.gov/ics/advisories/icsa-21-131-11 · Note
• https://us-cert.gov/ics/advisories/icsa-20-161-06 · Note
• https://ics-cert.kaspersky.com/advisories/klcert-advisories/2019/03/01/klcert-19-005-ultravnc-memory-leak · Note
• https://t.me/cvenotify/16772 · Telegram Post
• https://cert-portal.siemens.com/productcert/pdf/ssa-927095.pdf · Note