#VU28202 Out-of-bounds write in FreeRDP - CVE-2020-13398

Vulnerability identifier: #VU28202

Vulnerability risk: High

CVSSv4.0: 6.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2020-13398

CWE-ID: CWE-787

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 compromise vulnerable system.

The vulnerability exists due to a boundary error when processing untrusted input within the crypto_rsa_common() function in libfreerdp/crypto/crypto.c. A remote attacker can send specially crafted data to the application, trigger out-of-bounds write and execute arbitrary code on the target system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

FreeRDP: 2.1.0

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External links
https://github.com/FreeRDP/FreeRDP/commit/8305349a943c68b1bc8c158f431dc607655aadea
https://github.com/FreeRDP/FreeRDP/commit/8fb6336a4072abcee8ce5bd6ae91104628c7bb69
https://github.com/FreeRDP/FreeRDP/compare/2.1.0...2.1.1

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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.