Stack-based buffer overflow in UltraVNC - CVE-2019-8263
Published: November 25, 2019 / Updated: November 27, 2019
Vulnerability identifier: #VU22965
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2019-8263
CWE-ID: CWE-121
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: ultravnc.sourceforge.net
Affected software:
UltraVNC
UltraVNC
Detailed vulnerability description
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to a boundary error in VNC client code inside ShowConnInfo routine. A remote attacker that controls a malicious VNC server can trick a user to connect to it, trigger stack-based buffer overflow and cause a denial of service condition on the target system.
How to mitigate CVE-2019-8263
Install updates from vendor's website.