libhangul Hanja Dictionary Parsing Denial of Service

Executive Summary

This vulnerability is a flaw in libhangul, a library used for processing Hangul (Korean) text. When parsing Hanja dictionary files, the library does not validate that entries contain valid values alongside their keys. An attacker can exploit this by providing a maliciously crafted dictionary file to an application using libhangul, causing the application to crash and resulting in a Denial of Service (DoS).

Useful 0 Not Useful 0

Detection Guidance

This vulnerability can be detected by checking for crashes in applications using libhangul when processing Hanja dictionary files. Monitor application logs for unexpected terminations or segmentation faults during dictionary parsing.

Useful 0 Not Useful 0

Impact Analysis

If you use an application that relies on libhangul for processing Hanja dictionary files, an attacker could exploit this vulnerability to crash the application. This could disrupt services or functionality that depend on the library, leading to downtime or loss of access to critical features.

Useful 0 Not Useful 0

Compliance Impact

This vulnerability primarily causes Denial of Service (DoS) via application crashes, which may impact availability of systems processing Korean text. For GDPR, availability is a key principle, so repeated crashes could affect compliance with data access requirements. HIPAA requires availability of protected health information systems; crashes could disrupt access to critical data. However, the vulnerability does not directly impact confidentiality or integrity of data.

Useful 0 Not Useful 0

Mitigation Strategies

Update libhangul to the latest patched version. Avoid using untrusted Hanja dictionary files. Implement input validation for dictionary files in applications using libhangul.

Useful 0 Not Useful 0