Exposed dangerous method or function in Emacs - CVE-2024-53920
Published: December 20, 2024
Vulnerability identifier: #VU101890
CSH Severity: High
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber
CVE-ID: CVE-2024-53920
CWE-ID: CWE-749
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: GNU
Affected software:
Emacs
Emacs
Detailed vulnerability description
The vulnerability allows a remote attacker to compromise the affected system.
The vulnerability exists due to improper input validation in elisp-mode.el. A remote attacker can trick the victim into invoking elisp-completion-at-point (for code completion) on untrusted Emacs Lisp source code, trigger unsafe Lisp macro expansion and execute arbitrary code on the system.
How to mitigate CVE-2024-53920
Install updates from vendor's website.
Sources
- https://eshelyaron.com/posts/2024-11-27-emacs-aritrary-code-execution-and-how-to-avoid-it.html
- https://git.savannah.gnu.org/cgit/emacs.git/tag/?h=emacs-30.0.92
- https://git.savannah.gnu.org/cgit/emacs.git/tree/ChangeLog.4
- https://news.ycombinator.com/item?id=42256409
- https://yhetil.org/emacs/CAFXAjY5f4YfHAtZur1RAqH34UbYU56_t6t2Er0YEh1Sb7-W=hg%40mail.gmail.com/