Hancom Office XLS File Parser stack-based overflow

Summaryinfo

A vulnerability identified as critical has been detected in Hancom Office. This affects an unknown part of the component XLS File Parser. This manipulation causes stack-based overflow. This vulnerability is registered as CVE-2023-50234. Remote exploitation of the attack is possible. No exploit is available.

Detailsinfo

A vulnerability classified as critical was found in Hancom Office (affected version not known). Affected by this vulnerability is some unknown functionality of the component XLS File Parser. The manipulation with an unknown input leads to a stack-based overflow vulnerability. The CWE definition for the vulnerability is CWE-121. A stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function). As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

Hancom Office Cell XLS File Parsing Stack-based Buffer Overflow Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected installations of Hancom Office Cell. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file. The specific flaw exists within the parsing of XLS files. The issue results from the lack of proper validation of the length of user-supplied data prior to copying it to a stack-based buffer. An attacker can leverage this vulnerability to execute code in the context of the current process. Was ZDI-CAN-20386.

The weakness was published 12/21/2023 as ZDI-23-1856. It is possible to read the advisory at zerodayinitiative.com. This vulnerability is known as CVE-2023-50234 since 12/05/2023. It demands that the victim is doing some kind of user interaction. The technical details are unknown and an exploit is not publicly available. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 08/14/2025).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Vendor

• Hancom

Name

• Office

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CPE 2.2info

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