{"item": {"cve_id": "CVE-2023-38831", "ghsa_id": "", "osv_id": "", "title": "CVE-2023-38831", "description": "RARLAB WinRAR before 6.23 allows attackers to execute arbitrary code when a user attempts to view a benign file within a ZIP archive. The issue occurs because a ZIP archive may include a benign file (such as an ordinary .JPG file) and also a folder that has the same name as the benign file, and the contents of the folder (which may include executable content) are processed during an attempt to access only the benign file. This was exploited in the wild in April through October 2023.", "published_at": "2023-08-23T17:15:43.863", "modified_at": "2026-08-05T05:16:38.580", "vendor": "Rarlab", "product": "Winrar", "affected_versions": ["n/a"], "fixed_versions": [], "cvss_score": 7.8, "cvss_version": "3.1", "cvss_vector": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H", "severity": "HIGH", "epss_score": 0.99815, "epss_percentile": 0.99959, "epss_date": "2026-10-06", "is_kev": true, "kev_date": "2023-08-24", "kev_due_date": "2023-09-14", "kev_action": "Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.", "cwe_ids": ["CWE-345", "CWE-351"], "attack_vector": "LOCAL", "attack_complexity": "LOW", "privileges_required": "NONE", "user_interaction": "REQUIRED", "references": ["http://packetstormsecurity.com/files/174573/WinRAR-Remote-Code-Execution.html", "https://blog.google/threat-analysis-group/government-backed-actors-exploiting-winrar-vulnerability/", "https://news.ycombinator.com/item?id=37236100", "https://www.bleepingcomputer.com/news/security/winrar-zero-day-exploited-since-april-to-hack-trading-accounts/", "https://www.group-ib.com/blog/cve-2023-38831-winrar-zero-day/", "http://packetstormsecurity.com/files/174573/WinRAR-Remote-Code-Execution.html", "https://blog.google/threat-analysis-group/government-backed-actors-exploiting-winrar-vulnerability/", "https://news.ycombinator.com/item?id=37236100", "https://www.bleepingcomputer.com/news/security/winrar-zero-day-exploited-since-april-to-hack-trading-accounts/", "https://www.group-ib.com/blog/cve-2023-38831-winrar-zero-day/", "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-38831"], "source_urls": {"NVD": "https://nvd.nist.gov/vuln/detail/CVE-2023-38831", "CVE.org": "https://www.cve.org/CVERecord?id=CVE-2023-38831", "CISA": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-38831", "FIRST EPSS": "https://api.first.org/data/v1/epss?cve=CVE-2023-38831"}, "patch_available": null, "workaround_available": null, "sources": ["NVD", "CVE.org", "CISA", "FIRST EPSS"], "reference_items": [{"url": "http://packetstormsecurity.com/files/174573/WinRAR-Remote-Code-Execution.html", "tags": ["Exploit", "Third Party Advisory", "VDB Entry"], "source": "NVD", "name": ""}, {"url": "https://blog.google/threat-analysis-group/government-backed-actors-exploiting-winrar-vulnerability/", "tags": ["Exploit", "Third Party Advisory"], "source": "NVD", "name": ""}, {"url": "https://news.ycombinator.com/item?id=37236100", "tags": ["Issue Tracking"], "source": "NVD", "name": ""}, {"url": "https://www.bleepingcomputer.com/news/security/winrar-zero-day-exploited-since-april-to-hack-trading-accounts/", "tags": ["Exploit", "Press/Media Coverage", "Third Party Advisory"], "source": "NVD", "name": ""}, {"url": "https://www.group-ib.com/blog/cve-2023-38831-winrar-zero-day/", "tags": ["Exploit", "Press/Media Coverage", "Third Party Advisory"], "source": "NVD", "name": ""}, {"url": "http://packetstormsecurity.com/files/174573/WinRAR-Remote-Code-Execution.html", "tags": ["Exploit", "Third Party Advisory", "VDB Entry", "x_transferred"], "source": "NVD", "name": ""}, {"url": "https://blog.google/threat-analysis-group/government-backed-actors-exploiting-winrar-vulnerability/", "tags": ["Exploit", "Third Party Advisory", "x_transferred"], "source": "NVD", "name": ""}, {"url": "https://news.ycombinator.com/item?id=37236100", "tags": ["Issue Tracking", "x_transferred"], "source": "NVD", "name": ""}, {"url": "https://www.bleepingcomputer.com/news/security/winrar-zero-day-exploited-since-april-to-hack-trading-accounts/", "tags": ["Exploit", "Press/Media Coverage", "Third Party Advisory", "x_transferred"], "source": "NVD", "name": ""}, {"url": "https://www.group-ib.com/blog/cve-2023-38831-winrar-zero-day/", "tags": ["Exploit", "Press/Media Coverage", "Third Party Advisory", "x_transferred"], "source": "NVD", "name": ""}, {"url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-38831", "tags": ["US Government Resource", "government-resource"], "source": "NVD", "name": ""}], "cvss_v4_score": null, "cvss_v4_vector": "", "cvss_v4_severity": "", "nvd_status": "Analyzed", "cna": "mitre", "date_reserved": "2023-07-25T00:00:00.000Z", "ssvc": {"options": {"Exploitation": "active", "Automatable": "no", "Technical Impact": "total"}, "version": "2.0.3", "timestamp": "2023-08-23T00:00:00+00:00", "role": "CISA Coordinator"}, "affected_products": [{"vendor": "Rarlab", "product": "Winrar", "ranges": ["avant 6.23"], "first_unaffected": ["6.23"], "source": "NVD"}, {"vendor": "n/a", "product": "n/a", "ranges": ["n/a"], "first_unaffected": [], "source": "CVE.org"}], "kev_name": "RARLAB WinRAR Code Execution Vulnerability", "kev_short_description": "RARLAB WinRAR contains an unspecified vulnerability that allows an attacker to execute code when a user attempts to view a benign file within a ZIP archive.", "kev_ransomware": "Known", "kev_notes": "http://www.win-rar.com/singlenewsview.html?&L=0&tx_ttnews%5Btt_news%5D=232&cHash=c5bf79590657e32554c6683296a8e8aa;  https://nvd.nist.gov/vuln/detail/CVE-2023-38831", "kev_cwes": ["CWE-351"], "wordfence_id": "", "mentions_sources": [], "version_match": "unknown", "risk_score": 75, "risk_class": "Critique", "impact": {"confidentialite": "élevé", "integrite": "élevé", "disponibilite": "élevé", "summary": "Un attaquant exploitant cette vulnérabilité pourrait, selon les conditions décrites par les sources, nécessite un accès local, sans authentification préalable, requiert une interaction de l'utilisateur, affecter la confidentialité des données, l'intégrité du système et la disponibilité du service.", "basis": "CVSS 3.1"}, "mechanism": "", "mitigation": {"correction": {"available": true, "text": "Mettre à jour : selon les sources, ne sont plus concernées les versions à partir de Winrar 6.23."}, "mitigation": {"specific": "Aucune mesure de mitigation spécifique confirmée par les sources consultées. Consultez les références officielles pour d'éventuelles mesures détaillées.", "general": ["Maintenir le produit à jour et activer les mises à jour de sécurité.", "Restreindre l'exposition réseau du service au strict nécessaire.", "Appliquer le principe du moindre privilège.", "Surveiller les journaux et les alertes de sécurité."], "specific_links": []}, "containment": {"applicable": true, "actions": ["Action recommandée par la CISA : Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.", "Isoler ou restreindre l'accès au service concerné.", "Restreindre les flux réseau entrants/sortants liés au composant.", "Renforcer la surveillance des journaux et des accès.", "Désactiver temporairement le composant vulnérable si l'activité le permet."]}, "note": "Priorité aux consignes officielles de l'éditeur et des références. Vérifiez toujours l'avis de sécurité avant toute intervention en production.", "official_links": []}, "plain": {"verdict": "now", "verdict_label": "Exploité par des attaquants · à traiter aujourd'hui", "verdict_css": "now", "verdict_rank": 0, "headline": "Un attaquant peut faire exécuter du code de son choix, depuis l'appareil lui-même", "headline_is_derived": true, "action": "Mettre à jour vers Winrar 6.23 ou plus récent, version publiée comme non concernée.", "action_kind": "update", "concerned": [{"version": "Winrar 6.23 ou plus récent", "state": "safe", "state_label": "Non concerné", "todo": "Rien à faire. Gardez les mises à jour automatiques activées."}, {"version": "n/a", "state": "hit", "state_label": "Concerné", "todo": "Mettre à jour vers Winrar 6.23 ou plus récent, version publiée comme non concernée."}, {"version": "Je ne connais pas ma version", "state": "unknown", "state_label": "À vérifier", "todo": "La version s'affiche généralement dans le menu « À propos » ou « Aide » du logiciel."}], "steps": [{"title": "Sauvegarder avant d'intervenir", "detail": "Une copie récente des données et de la configuration. Si votre hébergeur propose une sauvegarde en un clic, c'est le moment.", "duration": "10 min", "priority": false}, {"title": "Mettre à jour vers Winrar 6.23 ou plus récent, version publiée comme non concernée", "detail": "C'est la correction officielle. Tant qu'elle n'est pas appliquée, les autres mesures ne sont que temporaires.", "duration": "15 à 45 min", "priority": true}, {"title": "En attendant : restreindre l'accès à l'appareil", "detail": "L'exploitation demande un accès local à la machine. Limiter qui peut s'y connecter suffit à contenir le risque immédiat.", "duration": "20 min", "priority": false}, {"title": "Vérifier que vous n'avez pas déjà été touché", "detail": "Cette faille est activement exploitée. Contrôler les comptes créés récemment, les connexions inhabituelles et les fichiers modifiés depuis la date de publication.", "duration": "30 min", "priority": true}, {"title": "Confirmer que tout fonctionne encore", "detail": "Après correction : page d'accueil, connexion, et les deux ou trois fonctions dont vous vous servez tous les jours.", "duration": "10 min", "priority": false}], "exploited": true, "exploited_label": "Oui, des attaques réelles sont constatées", "fixed_label": "Winrar 6.23 (non concernée selon les sources)", "affected_label": "n/a"}, "severity_display": "Élevée", "cvss_is_legacy": false, "risk_score_computable": true, "identifier": "CVE-2023-38831", "severity_fr": "Élevée", "epss_pct": 99.8, "source_records": [{"source": "NVD", "label": "NVD, NIST", "date_label": "Publié dans la base", "date": "2023-08-23", "url": "https://nvd.nist.gov/vuln/detail/CVE-2023-38831"}, {"source": "CVE.org", "label": "CVE.org, programme CVE", "date_label": "Publié par l'organisme CNA", "date": "2023-08-23", "url": "https://www.cve.org/CVERecord?id=CVE-2023-38831"}, {"source": "CISA", "label": "CISA KEV", "date_label": "Ajout au catalogue", "date": "2023-08-24", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-38831"}, {"source": "FIRST EPSS", "label": "FIRST EPSS", "date_label": "Score daté du", "date": "2026-10-06", "url": "https://api.first.org/data/v1/epss?cve=CVE-2023-38831"}], "exploit_public": true, "reseau_sans_auth": false, "exposition": "Avec un accès à la machine", "owasp": [{"code": "A08", "nom": "Défaillances d'intégrité des logiciels ou des données", "nom_officiel": "Software or Data Integrity Failures", "slug": "a08-integrite-des-logiciels-et-des-donnees", "libelle": "A08:2025 Défaillances d'intégrité des logiciels ou des données", "url_officielle": "https://top10.owasp.org/2025/A08_2025-Software_or_Data_Integrity_Failures/"}]}, "presentation": {"en_bref": [{"question": "Est-elle attaquée ?", "ton": "alerte", "reponse": "Oui, attaques constatées", "source": "Catalogue CISA KEV"}, {"question": "Existe-t-il un correctif ?", "ton": "bon", "reponse": "Oui : 6.23", "source": "Versions publiées comme non concernées"}, {"question": "Comment l'attaquer ?", "ton": "neutre", "reponse": "Avec un accès à la machine", "source": "Vecteur CVSS publié"}, {"question": "Risque d'exploitation", "ton": "alerte", "reponse": "99,8 % sur 30 jours", "source": "Plus probable que 100 % des failles connues"}], "references": [{"cle": "avis_tiers", "titre": "Avis d'autorités et d'organismes tiers", "explication": "CERT, agences gouvernementales, bases de vulnérabilités, chercheurs.", "items": [{"url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-38831", "domaine": "www.cisa.gov", "editeur": "CISA", "etiquettes": ["Ressource gouvernementale américaine", "Ressource gouvernementale"], "nom": "", "lien": true, "casse": false}]}, {"cle": "analyse", "titre": "Analyses, tickets et discussions", "explication": "Pour comprendre le défaut : description technique, ticket, liste de diffusion.", "items": [{"url": "https://news.ycombinator.com/item?id=37236100", "domaine": "news.ycombinator.com", "editeur": "", "etiquettes": ["Suivi de ticket"], "nom": "", "lien": true, "casse": false}]}, {"cle": "exploit", "titre": "Codes d'exploitation référencés", "explication": "Les sources signalent un code d'exploitation public. Par prudence, CyberAlert affiche le site qui l'héberge sans lien direct : l'information utile ici est son existence, qui rend la faille plus facile à attaquer.", "items": [{"url": "http://packetstormsecurity.com/files/174573/WinRAR-Remote-Code-Execution.html", "domaine": "packetstormsecurity.com", "editeur": "Packet Storm", "etiquettes": ["Code d'exploitation", "Avis d'un tiers", "Base de vulnérabilités"], "nom": "", "lien": false, "casse": false}, {"url": "https://blog.google/threat-analysis-group/government-backed-actors-exploiting-winrar-vulnerability/", "domaine": "blog.google", "editeur": "", "etiquettes": ["Code d'exploitation", "Avis d'un tiers"], "nom": "", "lien": false, "casse": false}, {"url": "https://www.bleepingcomputer.com/news/security/winrar-zero-day-exploited-since-april-to-hack-trading-accounts/", "domaine": "www.bleepingcomputer.com", "editeur": "", "etiquettes": ["Code d'exploitation", "Article de presse", "Avis d'un tiers"], "nom": "", "lien": false, "casse": false}, {"url": "https://www.group-ib.com/blog/cve-2023-38831-winrar-zero-day/", "domaine": "www.group-ib.com", "editeur": "", "etiquettes": ["Code d'exploitation", "Article de presse", "Avis d'un tiers"], "nom": "", "lien": false, "casse": false}]}], "liens_correction": [], "nb_exploits": 4, "cvss": {"version": "3.1", "vecteur": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H", "metriques": [{"code": "AV", "nom": "Vecteur d'attaque", "valeur": "Local (accès à la machine)", "brut": "L", "explication": "D'où l'attaquant doit agir."}, {"code": "AC", "nom": "Complexité de l'attaque", "valeur": "Faible", "brut": "L", "explication": "Conditions hors du contrôle de l'attaquant."}, {"code": "PR", "nom": "Privilèges requis", "valeur": "Aucun (pas de compte)", "brut": "N", "explication": "Droits dont l'attaquant a besoin avant d'attaquer."}, {"code": "UI", "nom": "Interaction de l'utilisateur", "valeur": "Requise", "brut": "R", "explication": "Une victime doit-elle cliquer ou ouvrir quelque chose ?"}, {"code": "S", "nom": "Portée", "valeur": "Inchangée", "brut": "U", "explication": "L'attaque peut-elle toucher d'autres composants que celui qui est vulnérable ?"}, {"code": "C", "nom": "Confidentialité", "valeur": "Élevé", "brut": "H", "explication": "Accès à des informations protégées."}, {"code": "I", "nom": "Intégrité", "valeur": "Élevé", "brut": "H", "explication": "Modification de données ou du système."}, {"code": "A", "nom": "Disponibilité", "valeur": "Élevé", "brut": "H", "explication": "Arrêt ou ralentissement du service."}], "calculateur": "https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H", "specification": "https://www.first.org/cvss/v3.1/specification-document"}, "cvss4": null, "cwe": [{"id": "CWE-345", "nom": "", "url": "https://cwe.mitre.org/data/definitions/345.html"}, {"id": "CWE-351", "nom": "", "url": "https://cwe.mitre.org/data/definitions/351.html"}], "owasp": [{"code": "A08", "nom": "Défaillances d'intégrité des logiciels ou des données", "nom_officiel": "Software or Data Integrity Failures", "slug": "a08-integrite-des-logiciels-et-des-donnees", "libelle": "A08:2025 Défaillances d'intégrité des logiciels ou des données", "url_officielle": "https://top10.owasp.org/2025/A08_2025-Software_or_Data_Integrity_Failures/"}], "ssvc": {"lignes": [{"nom": "Exploitation", "valeur": "Exploitation active constatée", "brut": "active"}, {"nom": "Automatisable", "valeur": "Non : l'attaque ne peut pas être entièrement automatisée", "brut": "no"}, {"nom": "Impact technique", "valeur": "Total : contrôle complet du composant ou de ses informations", "brut": "total"}], "version": "2.0.3", "date": "2023-08-23", "role": "CISA Coordinator", "url": "https://www.cisa.gov/stakeholder-specific-vulnerability-categorization-ssvc"}, "chronologie": [{"date": "2023-07-25", "libelle": "Identifiant réservé", "qui": "Programme CVE"}, {"date": "2023-08-23", "libelle": "Publication de la vulnérabilité", "qui": "mitre"}, {"date": "2023-08-23", "libelle": "Décision SSVC publiée", "qui": "CISA"}, {"date": "2023-08-24", "libelle": "Ajout au catalogue des failles exploitées", "qui": "CISA"}, {"date": "2023-09-14", "libelle": "Échéance de correction fixée par la CISA", "qui": "CISA"}, {"date": "2026-08-05", "libelle": "Dernière mise à jour de la fiche source", "qui": "Source"}, {"date": "2026-10-06", "libelle": "Calcul du score EPSS affiché", "qui": "FIRST"}], "liens_officiels": [{"nom": "NVD (NIST)", "url": "https://nvd.nist.gov/vuln/detail/CVE-2023-38831", "description": "Fiche de référence : CVSS, CPE, références étiquetées."}, {"nom": "CVE.org", "url": "https://www.cve.org/CVERecord?id=CVE-2023-38831", "description": "Enregistrement officiel publié par l'organisme qui a attribué l'identifiant."}, {"nom": "CISA KEV", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-38831", "description": "Entrée du catalogue des failles activement exploitées."}, {"nom": "FIRST EPSS", "url": "https://api.first.org/data/v1/epss?cve=CVE-2023-38831", "description": "Score de probabilité d'exploitation du jour."}, {"nom": "OSV.dev", "url": "https://osv.dev/vulnerability/CVE-2023-38831", "description": "Paquets open source concernés et versions corrigées."}, {"nom": "GitHub Advisory Database", "url": "https://github.com/advisories?query=CVE-2023-38831", "description": "Avis de sécurité des dépendances logicielles."}], "produits": [{"vendor": "Rarlab", "product": "Winrar", "ranges": ["avant 6.23"], "first_unaffected": ["6.23"], "source": "NVD"}, {"vendor": "n/a", "product": "n/a", "ranges": ["n/a"], "first_unaffected": [], "source": "CVE.org"}], "notes_kev": ["https://nvd.nist.gov/vuln/detail/CVE-2023-38831"]}, "consulted_at": "2026-10-07T07:10:39.402297+00:00"}