CVE-2020-14405 Denial of service in n/a
An attacker can cause a denial of service in LibVNCServer by sending an excessively large TextChat message, as the size is not limited.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2020-14405?
CVE-2020-14405 is a medium-severity denial of service vulnerability in Canonical Ubuntu Linux, published on 17 Jun 2020. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
An issue was discovered in LibVNCServer before 0.9.13. libvncclient/rfbproto.c does not limit TextChat size.
Weakness: CWE-770
Which versions are affected by CVE-2020-14405?
It affects 9 products.
Products include Canonical Ubuntu Linux, Debian Debian Linux, Libvnc Project Libvncserver, Siemens Simatic Itc1500 Firmware, Siemens Simatic Itc1500 Pro Firmware, Siemens Simatic Itc1900 Firmware and 3 more.
How do I fix CVE-2020-14405?
Upgrade to a fixed version.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2020-14405 being exploited?
There is no known exploitation of CVE-2020-14405 in the wild and no public exploit code.
Other vulnerabilities in Canonical Ubuntu Linux
Sources
Also known as DEBIAN-CVE-2020-14405, GHSA-vmf9-q8q4-wg87, UBUNTU-CVE-2020-14405.