Out-of-bounds read in FreeRDP - CVE-2020-11048

Vulnerability identifier: #VU27977

CSH Severity: Medium

CVSS v4: 7.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2020-11048

CWE-ID: CWE-125

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to a boundary condition in "rdp_read_flow_control_pdu". A remote authenticated attacker can trigger out-of-bounds read error and cause a denial of service condition on the target system.

Note: This vulnerability affects versions after 1.0

FreeRDP
freerdp (Red Hat package)
vinagre (Red Hat package)
libfreerdp-client1.1 (Ubuntu package)
libfreerdp-common1.1.0 (Ubuntu package)
libfreerdp-core1.1 (Ubuntu package)
Red Hat Enterprise Linux Workstation
Red Hat Enterprise Linux Desktop
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux for Power, big endian
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux Server
Red Hat Enterprise Linux for ARM 64
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 x86_64
Ubuntu

Install updates from vendor's website.

FreeRDP - update to 2.0.0
freerdp (Red Hat package) - addressed in versions 2.1.1-1.el8, 2.1.1-2.el7
vinagre (Red Hat package) - update to 3.22.0-23.el8
libfreerdp-client1.1 (Ubuntu package) - update to 1.1.0~git20140921.1.440916e+dfsg1-15ubuntu1.18.04.2
libfreerdp-common1.1.0 (Ubuntu package) - update to 1.1.0~git20140921.1.440916e+dfsg1-15ubuntu1.18.04.2
libfreerdp-core1.1 (Ubuntu package) - update to 1.1.0~git20140921.1.440916e+dfsg1-15ubuntu1.18.04.2

• https://github.com/FreeRDP/FreeRDP/commit/9301bfe730c66180263248b74353daa99f5a969b
• https://github.com/FreeRDP/FreeRDP/issues/6007
• https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-hv8w-f2hx-5gcv

• Multiple vulnerabilities in FreeRDP
• Red Hat Enterprise Linux 7 update for freerdp
• Red Hat Enterprise Linux 8 update for freerdp and vinagre
• Ubuntu update for freerdp