rhsa-2025:4793
Vulnerability from csaf_redhat
Published
2025-05-12 10:29
Modified
2025-08-03 09:30
Summary
Red Hat Security Advisory: emacs security update
Notes
Topic
An update for emacs is now available for Red Hat Enterprise Linux 9.4 Extended Update Support.
Red Hat Product Security has rated this update as having a security impact of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.
Details
GNU Emacs is a powerful, customizable, self-documenting text editor. It provides special code editing features, a scripting language (elisp), and the capability to read e-mail and news.
Security Fix(es):
* emacs: arbitrary code execution via Lisp macro expansion (CVE-2024-53920)
For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
Terms of Use
This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.
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"cve": "CVE-2024-53920",
"cwe": {
"id": "CWE-94",
"name": "Improper Control of Generation of Code (\u0027Code Injection\u0027)"
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"discovery_date": "2024-11-27T15:01:05.611448+00:00",
"ids": [
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"text": "2329161"
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{
"category": "description",
"text": "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.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "emacs: arbitrary code execution via Lisp macro expansion",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "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.\nFor these reasons, this flaw has been rated with a Moderate severity.\n\nWithin 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 (\u0027Code Injection\u0027) vulnerability and therefore downgrades the severity of this particular CVE from Moderate to Low.\n\nThe 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.",
"title": "Statement"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
],
"product_status": {
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"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2024-53920"
},
{
"category": "external",
"summary": "RHBZ#2329161",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2329161"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2024-53920",
"url": "https://www.cve.org/CVERecord?id=CVE-2024-53920"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2024-53920",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2024-53920"
},
{
"category": "external",
"summary": "https://eshelyaron.com/posts/2024-11-27-emacs-aritrary-code-execution-and-how-to-avoid-it.html",
"url": "https://eshelyaron.com/posts/2024-11-27-emacs-aritrary-code-execution-and-how-to-avoid-it.html"
},
{
"category": "external",
"summary": "https://yhetil.org/emacs/CAFXAjY5f4YfHAtZur1RAqH34UbYU56_t6t2Er0YEh1Sb7-W=hg%40mail.gmail.com/",
"url": "https://yhetil.org/emacs/CAFXAjY5f4YfHAtZur1RAqH34UbYU56_t6t2Er0YEh1Sb7-W=hg%40mail.gmail.com/"
}
],
"release_date": "2024-11-27T00:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2025-05-12T10:29:22+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258",
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"restart_required": {
"category": "none"
},
"url": "https://access.redhat.com/errata/RHSA-2025:4793"
},
{
"category": "workaround",
"details": "Do not open or view untrusted Emacs Lisp source code files.\n\nDisabling auto-completion features and automatic error checking such as Flymake or Flycheck in untrusted Emacs Lisp source code files will mitigate this vulnerability.",
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{
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"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 7.8,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "REQUIRED",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
"version": "3.1"
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],
"threats": [
{
"category": "impact",
"details": "Moderate"
}
],
"title": "emacs: arbitrary code execution via Lisp macro expansion"
}
]
}
Loading…
Loading…
Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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