CVE-2020-4031 Use-After-Free in gdi_SelectObject in FreeRDP
A use-after-free in FreeRDP allows attackers to execute code or cause denial of service when clients use compatibility mode with relaxed order checks.
- 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-2020-4031?
CVE-2020-4031 is a low-severity use after free vulnerability in Canonical Ubuntu Linux, published on 22 Jun 2020. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
In FreeRDP before version 2.1.2, there is a use-after-free in gdi_SelectObject. All FreeRDP clients using compatibility mode with /relax-order-checks are affected. This is fixed in version 2.1.2.
Weakness: CWE-416
Which versions are affected by CVE-2020-4031?
It affects 5 products.
Products include Canonical Ubuntu Linux, Debian Debian Linux, Fedoraproject Fedora, Freerdp Freerdp, Opensuse Leap.
How do I fix CVE-2020-4031?
Upgrade to a fixed version.
Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.
Is CVE-2020-4031 being exploited?
There is no known exploitation of CVE-2020-4031 in the wild and no public exploit code.
Other vulnerabilities in Canonical Ubuntu Linux
Sources
Also known as CLEANSTART-2024-WK92856, DEBIAN-CVE-2020-4031, GHSA-gwcq-hpq2-m74g, UBUNTU-CVE-2020-4031.