Out-of-bounds read in FreeRDP - CVE-2020-4033

Vulnerability identifier: #VU29362

CSH Severity: Medium

CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N]

CVE-ID: CVE-2020-4033

CWE-ID: CWE-125

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to gain access to potentially sensitive information.

The vulnerability exists due to a boundary condition in RLEDECOMPRESS. A remote attacker can trigger out-of-bounds read error and read contents of memory on the system.

FreeRDP
Arch Linux
Anolis OS
Red Hat CodeReady Linux Builder for ARM 64
Red Hat CodeReady Linux Builder for Power, little endian
Red Hat CodeReady Linux Builder for x86_64
Red Hat Enterprise Linux for ARM 64
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux for x86_64
Opensuse
Ubuntu
Fedora
freerdp (Alpine package)
freerdp (Red Hat package)
libfreerdp-client2-2 (Ubuntu package)
libfreerdp-server2-2 (Ubuntu package)
libfreerdp2-2 (Ubuntu package)
freerdp
freerdp-libs
libwinpr
libwinpr-devel

Install updates from vendor's website.

FreeRDP - update to 2.1.2
freerdp (Alpine package) - update to 2.1.2-r0
freerdp (Red Hat package) - update to 2.2.0-1.el8
libfreerdp-client2-2 (Ubuntu package) - addressed in versions 2.2.0+dfsg1-0ubuntu0.18.04.1, 2.2.0+dfsg1-0ubuntu0.20.04.1
libfreerdp-server2-2 (Ubuntu package) - addressed in versions 2.2.0+dfsg1-0ubuntu0.18.04.1, 2.2.0+dfsg1-0ubuntu0.20.04.1
libfreerdp2-2 (Ubuntu package) - addressed in versions 2.2.0+dfsg1-0ubuntu0.18.04.1, 2.2.0+dfsg1-0ubuntu0.20.04.1
freerdp - addressed in versions 2.2.0-1.fc31, 2.2.0-1.fc32, 2.2.0-4.fc33
freerdp - update to 2.2.0-6
freerdp-libs - update to 2.2.0-6
libwinpr - update to 2.2.0-6
libwinpr-devel - update to 2.2.0-6

• http://www.freerdp.com/2020/06/22/2_1_2-released
• https://github.com/FreeRDP/FreeRDP/commit/0a98c450c58ec150e44781c89aa6f8e7e0f571f5
• https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-7rhj-856w-82p8

• Multiple vulnerabilities in FreeRDP
• Arch Linux update for freerdp
• OpenSUSE Linux update for freerdp
• Out-of-bounds read in freerdp (Alpine package)
• Red Hat Enterprise Linux 8 update for freerdp
• Anolis OS update for freerdp (Anolis OS 8.4)
• Ubuntu update for freerdp2
• Fedora 31 update for freerdp
• Fedora 32 update for freerdp
• Fedora 33 update for freerdp