CVE-2020-4033 OOB Read in RLEDECOMPRESS in FreeRDP

What is CVE-2020-4033?

CVE-2020-4033 is a low-severity memory corruption 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 an out of bounds read in RLEDECOMPRESS. All FreeRDP based clients with sessions with color depth < 32 are affected. This is fixed in version 2.1.2.

Weakness: CWE-125

Which versions are affected by CVE-2020-4033?

It affects 5 products.

Products include Canonical Ubuntu Linux, Debian Debian Linux, Fedoraproject Fedora, Freerdp Freerdp, Opensuse Leap.

How do I fix CVE-2020-4033?

Upgrade to a fixed version.

Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.

Is CVE-2020-4033 being exploited?

There is no known exploitation of CVE-2020-4033 in the wild and no public exploit code.

Other vulnerabilities in Canonical Ubuntu Linux

• CVE-2020-11651 SaltStack Salt Authentication Bypass Exploited Critical 9.8
• CVE-2020-7247 OpenSMTPD Remote Code Execution Exploited Critical 9.8
• CVE-2019-16928 Exim Out-of-bounds Write Exploited Critical 9.8
• CVE-2018-6789 Exim Buffer Overflow Exploited Critical 9.8
• CVE-2015-2590 Oracle Java SE and Java SE Embedded Remote Code Execution Exploited Critical 9.8

All Canonical Ubuntu Linux vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as CLEANSTART-2024-PG65301, DEBIAN-CVE-2020-4033, GHSA-7rhj-856w-82p8, UBUNTU-CVE-2020-4033.