The Release of Notepad++ 8.5.7 Security Update

The developer of the popular open source plain text editor Notepad++ has recently released an important security update, Notepad++ 8.5.7. This update addresses four security vulnerabilities in the client and also introduces some noteworthy changes.

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Installing the Update

To install the update, existing users can simply click on the question-mark icon in the Notepad++ interface and select “Update Notepad++” from the menu. For new users or those who prefer manual downloads, the latest version can be found on the official GitHub project website, including the portable version.

The Security Fixes

The security issues addressed in this update were reported to the project some time ago and were recently made public. One of the issues, CVE-2023-40031, has been given a high severity rating, whereas the other three issues, CVE-2023-40036, CVE-2023-40164, and CVE-2023-40166, have medium severity ratings.

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The high severity issue, CVE-2023-40031, is related to a heap buffer write overflow security issue in Utf8_16_Read::convert, which is responsible for handling conversions between UTF8 and UTF16. If successfully exploited, it can lead to arbitrary code execution.

CVE-2023-40031 describes a global buffer read overflow issue that could occur when a specially crafted file is loaded, potentially leading to reading past the bounds of a globally allocated object buffer. This issue has the potential to leak internal memory allocation information.

CVE-2023-40036 and CVE-2023-40164 also involve buffer overflow issues, and although their exploitability is not clear, they may also be used to leak internal memory allocation information.

Non-Security Changes in Notepad++ 8.5.7

In addition to the security fixes, the update includes several non-security changes. For instance, the uninstall.exe application of Notepad++ has been signed, enhancing security. Other changes include fixing a potential memory leak while reading UTF8-16 files, improving tab dragging performance when the document list is displayed, adding a Superrss 2GB file warning option for x64, addressing a cloned document disassociation issue after relaunch, resolving a file session saving issue for read-only files, fixing an issue that caused incorrect files to be activated after loading session files, and correctly displaying the product version value in the file’s properties. Furthermore, the installer’s slogan has been changed.

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Closing Thoughts

It is highly recommended that Notepad++ users update to the latest version, Notepad++ 8.5.7, to address the security vulnerabilities in the text editor. Although the vulnerabilities require specially crafted files for exploitation, it is crucial to upgrade immediately to ensure the safety and security of your system.

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Now You: Which plain text editor do you use?