#VU49296 Unexpected Sign Extension in TextMaker 2021 - CVE-2020-13544
Published: January 6, 2021
Vulnerability identifier: #VU49296
Vulnerability risk: High
CVSSv4.0: CVSS:4.0/AV:L/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-2020-13544
CWE-ID: CWE-194
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerable software:
TextMaker 2021
TextMaker 2021
Software vendor:
SoftMaker
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.
Remediation
Cybersecurity Help is currently unaware of any official solution to address this vulnerability.