Critical Security Flaw in GNU Emacs: Arbitrary Code Execution Vulnerability
Summary
RLSA-2025:4787: Moderate: emacs security update. Affects emacs versions < 1:27.2-11.el9_5.2. Fixed in 1:27.2-11.el9_5.2. How to fix ↓
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Background
GNU Emacs is a powerful, customizable, self-documenting text editor widely used for programming and text manipulation. It features advanced code editing capabilities, a built-in scripting language (elisp), and the ability to manage emails and news. However, recent vulnerabilities have raised concerns regarding its security, particularly with the potential for arbitrary code execution through Lisp macro expansion.
Vulnerability Detail
The vulnerability identified as CVE-2024-53920 allows for arbitrary code execution via Lisp macro expansion in GNU Emacs. This flaw can be exploited by an attacker to execute malicious code within the Emacs environment, potentially compromising the user's system and data. The vulnerability arises from improper handling of Lisp macros, which can lead to unauthorized code execution when processed by the editor.
How To Fix
Minimum fixed version
1:27.2-11.el9_5.2
This is the first release that contains the fix.
sudo dnf update emacsTip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
As a temporary measure, users are advised to avoid executing untrusted Lisp code or macros within Emacs until the package is updated to the fixed version. This can help mitigate the risk of exploitation while waiting for a proper patch.
Conclusion
The vulnerability in GNU Emacs poses a significant risk due to its potential for arbitrary code execution. Users are strongly encouraged to update to the patched version to safeguard their systems. By following the provided steps and utilizing tools like Vulert, users can effectively monitor and manage their software vulnerabilities.
See every vulnerability recorded for emacs →
FAQ
CVE-2024-53920 is a vulnerability in GNU Emacs that allows for arbitrary code execution through Lisp macro expansion.
You can use Vulert, which monitors open-source vulnerabilities in your software. Simply upload your manifest file like package-lock.json to check for vulnerabilities.
As a workaround, avoid executing untrusted Lisp code or macros until you can update to the patched version.
Exploitation of this vulnerability could allow attackers to execute arbitrary code, potentially compromising user data and system integrity.
For detailed information, refer to the CVE page associated with CVE-2024-53920, which includes technical details and impact assessments.
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