Vulnerability identifier: #VU49296

Vulnerability risk: High

CVSSv3.1: 8.1 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:U/RC:C]

CVE-ID: CVE-2020-13544

CWE-ID: CWE-194

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
TextMaker 2021
Client/Desktop applications / Office applications

Vendor: SoftMaker

Description

The vulnerability allows a remote attacker to compromise the target system.

The vulnerability exists due to unexpected sign extension in the TextMaker document parsing functionality within record 0x001f. A remote attacker can trick a victim to open a specially crafted document and cause the document parser to sign-extend a length used to terminate a loop, resulting in the loop’s index being used to write outside the bounds of a heap buffer during the reading of file data.

Mitigation
Cybersecurity Help is currently unaware of any official solution to address this vulnerability.

Vulnerable software versions

TextMaker 2021: revision 1014

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External links
http://www.talosintelligence.com/vulnerability_reports/TALOS-2020-1161

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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.