Out-of-bounds read in FreeRDP - CVE-2020-11526

Vulnerability identifier: #VU27971

CSH Severity: Medium

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

CVE-ID: CVE-2020-11526

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 "update_recv_secondary_order" function in the "libfreerdp/core/update.c" file. A remote attacker can trigger out-of-bounds read error and cause a denial of service condition on the target system.

Note: This vulnerability affects verions greater than 1.1

FreeRDP
Gentoo Linux
Red Hat Enterprise Linux Server
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
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 x86_64
Opensuse
Ubuntu
openEuler
freerdp (Red Hat package)
vinagre (Red Hat package)
libfreerdp-core1.1 (Ubuntu package)
libfreerdp-common1.1.0 (Ubuntu package)
libfreerdp-client1.1 (Ubuntu package)
freerdp (Alpine package)
freerdp
freerdp-debugsource
libwinpr
freerdp-help
freerdp-debuginfo
libwinpr-devel
freerdp-devel
freerdp-libs

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-core1.1 (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-client1.1 (Ubuntu package) - update to 1.1.0~git20140921.1.440916e+dfsg1-15ubuntu1.18.04.2
freerdp (Alpine package) - update to 2.0.0-r0
freerdp - update to 2.2.0-2
freerdp-debugsource - update to 2.2.0-2
libwinpr - update to 2.2.0-2
freerdp-help - update to 2.2.0-2
freerdp-debuginfo - update to 2.2.0-2
libwinpr-devel - update to 2.2.0-2
freerdp-devel - update to 2.2.0-2
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

• https://github.com/FreeRDP/FreeRDP/commits/master
• https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-97jw-m5w5-xvf9
• https://pub.freerdp.com/cve/CVE-2020-11526/pocAnalysis_4.pdf

• Multiple vulnerabilities in FreeRDP
• Gentoo update for FreeRDP
• OpenSUSE Linux update for freerdp
• Out-of-bounds read in freerdp (Alpine package)
• Red Hat Enterprise Linux 7 update for freerdp
• Red Hat Enterprise Linux 8 update for freerdp and vinagre
• openEuler update for freerdp
• Anolis OS update for freerdp (Anolis OS 8.4)
• Ubuntu update for freerdp