Remote code execution in Kingsoft WPS Office

1) Use-after-free

EUVDB-ID: #VU63114

Risk: High

CVSSv3.1: 7.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-40399

CWE-ID: CWE-416 - Use After Free

Exploit availability: No

Description

The vulnerability allows a remote attacker to compromise vulnerable system.

The vulnerability exists due to a use-after-free error in WPS Spreadsheets (ET). A remote attacker can use a specially crafted XLS file and execute arbitrary code on the target system.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

WPS Office: 11.2.0.10351

External links

http://www.talosintelligence.com/vulnerability_reports/TALOS-2021-1412

Q & A

Can this vulnerability be exploited remotely?

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

How the attacker can exploit this vulnerability?

The attacker would have to trick the victim to visit a specially crafted website or open a file.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.