#VU27971 Out-of-bounds read in FreeRDP - CVE-2020-11526

Vulnerability identifier: #VU27971

Vulnerability risk: Medium

CVSSv4.0: 7.7 [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/E:P/U:Green]

CVE-ID: CVE-2020-11526

CWE-ID: CWE-125

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
FreeRDP
Universal components / Libraries / Libraries used by multiple products

Vendor: FreeRDP

Description

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

Mitigation
Install updates from vendor's website.

Vulnerable software versions

FreeRDP: 2.0.0 rc4

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External links
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

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability. However, proof of concept for this vulnerability is available.