PT-2022-1652 · Hancom · Hancom Office

Icewall + 1 · Published 2022-02-16 · Updated 2022-05-12 · CVE-2021-21958

Positive Technologies (AI Summary)

CVSS v3.1

7.8

High

Base vector

AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Name of the Vulnerable Software and Affected Versions Hancom Office 2020 version 11.0.0.2353

Description A heap-based buffer overflow issue exists in the Hword functionality of Hancom Office, specifically in HwordApp.dll. This can be triggered by a specially-crafted malformed file, leading to memory corruption and potential arbitrary code execution. An attacker can exploit this by providing a malicious file.

Recommendations For Hancom Office 2020 version 11.0.0.2353, consider avoiding the use of HwordApp.dll functionality until a patch is available. As a temporary workaround, refrain from opening files from untrusted sources to minimize the risk of exploitation. At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Exploit

Memory Corruption

Heap Based Buffer Overflow

Weakness Enumeration

CWE-787

CWE-122

Related Identifiers

BDU:2022-00902

CVE-2021-21958

Affected Products

Hancom Office

References · 6

• 🔥 https://blog.talosintelligence.com/2022/02/vuln-spotlight-.html · Exploit
• 🔥 https://talosintelligence.com/vulnerability_reports/TALOS-2021-1386 · Exploit
• https://nvd.nist.gov/vuln/detail/CVE-2021-21958 · Security Note
• https://osv.dev/vulnerability/CVE-2021-21958 · Vendor Advisory
• https://bdu.fstec.ru/vul/2022-00902 · Security Note
• https://t.me/cibsecurity/37599 · Telegram Post