Heap-based buffer overflow in UltraVNC - CVE-2019-8258
Published: November 25, 2019 / Updated: November 27, 2019
Vulnerability identifier: #VU22960
CSH Severity: Medium
CVSS v4: 7.5 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2019-8258
CWE-ID: CWE-122
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to a boundary error in VNC client. A remote attacker that controls a malicious VNC server can trick a user to connect to it, trigger heap-based buffer overflow and execute arbitrary code with privileges of the user, running the VNC client.
Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.
Affected software
UltraVNC
How to mitigate CVE-2019-8258
Install updates from vendor's website.
UltraVNC - update to 1.2.2.3