Notepad++ is a free and open-source source code editor. Prior to 8.9.8, Notepad++ contains a stack buffer overflow in NppParameters::writeSession in PowerEditor/src/Parameters.cpp because it copies a session path derived from -settingsDir= into backupPathName[MAX_PATH] with unbounded wcscpy and appends SESSION_BACKUP_EXT with unbounded wcscat. A sufficiently long settings directory causes the backup suffix to exceed the fixed stack buffer when Notepad++ saves the session, and the protected release build terminates through its stack canary, causing denial of service.
This issue is fixed in version 8.9.8.
Attack Parameters
Attack Vector
Local
Requires local access
Attack Complexity
Low
Easy to exploit
Privileges Required
None
No privileges needed
User Interaction
Required
User action required
Impact Assessment
Confidentiality
High
Complete data leak
Integrity
High
Complete data modification
Availability
High
Complete denial of service
CVSS Vector v3.1
Weakness Type (CWE)
References 4
https://github.com/notepad-plus-plus/notepad-plus-plus/commit/046af3f626be77158…
security-advisories@github.com
https://github.com/notepad-plus-plus/notepad-plus-plus/releases/tag/v8.9.8
security-advisories@github.com
https://github.com/notepad-plus-plus/notepad-plus-plus/security/advisories/GHSA…
security-advisories@github.com
https://notepad-plus-plus.org/news/v898-released
security-advisories@github.com