Out-of-bounds read in UltraVNC - CVE-2019-8261
Published: November 25, 2019 / Updated: November 27, 2019
Vulnerability identifier: #VU22963
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2019-8261
CWE-ID: CWE-125
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 gain access to sensitive information on the target system.
The vulnerability exists due to a boundary condition in VNC code inside client CoRRE decoder, caused by multiplication overflow. A remote attacker that controls a malicious VNC server can trick a user to connect to it, trigger out-of-bounds read error and read contents of memory on the system.
How to mitigate CVE-2019-8261
Install updates from vendor's website.