Описание
In elisp-mode.el in GNU Emacs before 30.1, a user who chooses to invoke elisp-completion-at-point (for code completion) on untrusted Emacs Lisp source code can trigger unsafe Lisp macro expansion that allows attackers to execute arbitrary code. (This unsafe expansion also occurs if a user chooses to enable on-the-fly diagnosis that byte compiles untrusted Emacs Lisp source code.)
A flaw was found in Emacs. Viewing or editing an untrusted Emacs Lisp source code file can cause arbitrary code execution due to unsafe macro expansion when a user has configured elisp-completion-at-point for code completion or has enabled automatic error checking, such as Flymake or Flycheck.
Отчет
To exploit this flaw, an attacker needs to trick a user into opening an Emacs Lisp source code file with a crafted macro definition. Additionally, the user must have elisp-completion-at-point configured or automatic error checking enabled.
For these reasons, this flaw has been rated with a Moderate severity.
Within regulated environments, a combination of the following controls acts as a significant barrier to successfully exploiting a CWE-94: Improper Control of Generation of Code ('Code Injection') vulnerability and therefore downgrades the severity of this particular CVE from Moderate to Low.
The platform leverages a web application firewall (WAF) to filter and block malicious input before it reaches the application. It applies managed and custom rule sets to detect suspicious patterns such as embedded scripting functions and remote code execution attempts. By enforcing strict input validation and preventing unauthorized execution of user-supplied code, the WAF reduces the risk of exploitation. Additional protections like rate limiting and bot mitigation help prevent automated injection attacks, while integration with logging, monitoring, and threat detection systems enhances visibility and response capabilities. Through real-time monitoring and automated blocking, the WAF provides a strong layer of defense against code injection vulnerabilities, lowering the likelihood of successful exploitation.
Меры по смягчению последствий
Do not open or view untrusted Emacs Lisp source code files. Disabling auto-completion features and automatic error checking such as Flymake or Flycheck in untrusted Emacs Lisp source code files will mitigate this vulnerability.
Затронутые пакеты
| Платформа | Пакет | Состояние | Рекомендация | Релиз |
|---|---|---|---|---|
| Red Hat Enterprise Linux 6 | emacs | Out of support scope | ||
| Red Hat Enterprise Linux 7 | emacs | Out of support scope | ||
| Red Hat Enterprise Linux 8 | emacs | Fixed | RHSA-2025:11030 | 15.07.2025 |
| Red Hat Enterprise Linux 8 | emacs | Fixed | RHSA-2025:11030 | 15.07.2025 |
| Red Hat Enterprise Linux 9 | emacs | Fixed | RHSA-2025:4787 | 12.05.2025 |
| Red Hat Enterprise Linux 9 | emacs | Fixed | RHSA-2025:9448 | 24.06.2025 |
| Red Hat Enterprise Linux 9.2 Extended Update Support | emacs | Fixed | RHSA-2025:4794 | 12.05.2025 |
| Red Hat Enterprise Linux 9.4 Extended Update Support | emacs | Fixed | RHSA-2025:4793 | 12.05.2025 |
| Red Hat Discovery 2 | registry.redhat.io/discovery/discovery-server-rhel9 | Fixed | RHSA-2025:11487 | 21.07.2025 |
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Дополнительная информация
Статус:
EPSS
7.8 High
CVSS3
Связанные уязвимости
In elisp-mode.el in GNU Emacs before 30.1, a user who chooses to invoke elisp-completion-at-point (for code completion) on untrusted Emacs Lisp source code can trigger unsafe Lisp macro expansion that allows attackers to execute arbitrary code. (This unsafe expansion also occurs if a user chooses to enable on-the-fly diagnosis that byte compiles untrusted Emacs Lisp source code.)
In elisp-mode.el in GNU Emacs before 30.1, a user who chooses to invoke elisp-completion-at-point (for code completion) on untrusted Emacs Lisp source code can trigger unsafe Lisp macro expansion that allows attackers to execute arbitrary code. (This unsafe expansion also occurs if a user chooses to enable on-the-fly diagnosis that byte compiles untrusted Emacs Lisp source code.)
In elisp-mode.el in GNU Emacs before 30.1, a user who chooses to invok ...
EPSS
7.8 High
CVSS3