CVE-2023-49284

{"dataType": "CVE_RECORD", "dataVersion": "5.1", "cveMetadata": {"cveId": "CVE-2023-49284", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2023-11-24T16:45:24.312Z", "datePublished": "2023-12-04T23:46:35.567Z", "dateUpdated": "2025-02-13T17:18:37.222Z"}, "containers": {"cna": {"title": "Command substitution output can trigger shell expansion in fish shell", "problemTypes": [{"descriptions": [{"cweId": "CWE-436", "lang": "en", "description": "CWE-436: Interpretation Conflict", "type": "CWE"}]}], "metrics": [{"cvssV3_1": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "LOW", "baseScore": 3.9, "baseSeverity": "LOW", "confidentialityImpact": "LOW", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:L/I:N/A:L", "version": "3.1"}}], "references": [{"name": "https://github.com/fish-shell/fish-shell/security/advisories/GHSA-2j9r-pm96-wp4f", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/fish-shell/fish-shell/security/advisories/GHSA-2j9r-pm96-wp4f"}, {"name": "https://github.com/fish-shell/fish-shell/commit/09986f5563e31e2c900a606438f1d60d008f3a14", "tags": ["x_refsource_MISC"], "url": "https://github.com/fish-shell/fish-shell/commit/09986f5563e31e2c900a606438f1d60d008f3a14"}, {"url": "http://www.openwall.com/lists/oss-security/2023/12/08/1"}], "affected": [{"vendor": "fish-shell", "product": "fish-shell", "versions": [{"version": "< 3.6.2", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2023-12-08T21:06:17.905Z"}, "descriptions": [{"lang": "en", "value": "fish is a smart and user-friendly command line shell for macOS, Linux, and the rest of the family. fish shell uses certain Unicode non-characters internally for marking wildcards and expansions. It will incorrectly allow these markers to be read on command substitution output, rather than transforming them into a safe internal representation. While this may cause unexpected behavior with direct input (for example, echo \\UFDD2HOME has the same output as echo $HOME), this may become a minor security problem if the output is being fed from an external program into a command substitution where this output may not be expected. This design flaw was introduced in very early versions of fish, predating the version control system, and is thought to be present in every version of fish released in the last 15 years or more, although with different characters. Code execution does not appear to be possible, but denial of service (through large brace expansion) or information disclosure (such as variable expansion) is potentially possible under certain circumstances. fish shell 3.6.2 has been released to correct this issue. Users are advised to upgrade. There are no known workarounds for this vulnerability."}], "source": {"advisory": "GHSA-2j9r-pm96-wp4f", "discovery": "UNKNOWN"}}, "adp": [{"providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-02T21:53:44.879Z"}, "title": "CVE Program Container", "references": [{"name": "https://github.com/fish-shell/fish-shell/security/advisories/GHSA-2j9r-pm96-wp4f", "tags": ["x_refsource_CONFIRM", "x_transferred"], "url": "https://github.com/fish-shell/fish-shell/security/advisories/GHSA-2j9r-pm96-wp4f"}, {"name": "https://github.com/fish-shell/fish-shell/commit/09986f5563e31e2c900a606438f1d60d008f3a14", "tags": ["x_refsource_MISC", "x_transferred"], "url": "https://github.com/fish-shell/fish-shell/commit/09986f5563e31e2c900a606438f1d60d008f3a14"}, {"url": "http://www.openwall.com/lists/oss-security/2023/12/08/1", "tags": ["x_transferred"]}]}]}}

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{"affected": [{"affectedData": [{"product": "fish-shell", "vendor": "fish-shell", "versions": [{"status": "affected", "version": "< 3.6.2"}]}], "source": "security-advisories@github.com"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:fishshell:fish:*:*:*:*:*:*:*:*", "matchCriteriaId": "2274FD09-F6AF-4F35-AAD6-9D48F8045BB7", "versionEndExcluding": "3.6.2", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "fish is a smart and user-friendly command line shell for macOS, Linux, and the rest of the family. fish shell uses certain Unicode non-characters internally for marking wildcards and expansions. It will incorrectly allow these markers to be read on command substitution output, rather than transforming them into a safe internal representation. While this may cause unexpected behavior with direct input (for example, echo \\UFDD2HOME has the same output as echo $HOME), this may become a minor security problem if the output is being fed from an external program into a command substitution where this output may not be expected. This design flaw was introduced in very early versions of fish, predating the version control system, and is thought to be present in every version of fish released in the last 15 years or more, although with different characters. Code execution does not appear to be possible, but denial of service (through large brace expansion) or information disclosure (such as variable expansion) is potentially possible under certain circumstances. fish shell 3.6.2 has been released to correct this issue. Users are advised to upgrade. There are no known workarounds for this vulnerability."}, {"lang": "es", "value": "fish es un shell de l\u00ednea de comandos inteligente y f\u00e1cil de usar para macOS, Linux y el resto de la familia. fish shell utiliza internamente ciertos caracteres que no son Unicode para marcar comodines y expansiones. Permitir\u00e1 incorrectamente que estos marcadores se lean en la salida de sustituci\u00f3n de comandos, en lugar de transformarlos en una representaci\u00f3n interna segura. Si bien esto puede causar un comportamiento inesperado con la entrada directa (por ejemplo, echo \\UFDD2HOME tiene el mismo resultado que echo $HOME), esto puede convertirse en un problema de seguridad menor si el resultado se env\u00eda desde un programa externo a un comando de sustituci\u00f3n donde este resultado puede que no se espere. Este defecto de dise\u00f1o se introdujo en versiones muy tempranas de Fish, anteriores al sistema de control de versiones, y se cree que est\u00e1 presente en todas las versiones de Fish lanzadas en los \u00faltimos 15 a\u00f1os o m\u00e1s, aunque con caracteres diferentes. La ejecuci\u00f3n del c\u00f3digo no parece posible, pero la denegaci\u00f3n de servicio (mediante una gran expansi\u00f3n de llaves) o la divulgaci\u00f3n de informaci\u00f3n (como la expansi\u00f3n de variables) es potencialmente posible en determinadas circunstancias. Se lanz\u00f3 Fish Shell 3.6.2 para corregir este problema. Se recomienda a los usuarios que actualicen. No se conocen workarounds para esta vulnerabilidad."}], "id": "CVE-2023-49284", "lastModified": "2026-06-17T06:35:45.940", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "LOW", "baseScore": 3.9, "baseSeverity": "LOW", "confidentialityImpact": "LOW", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:L/I:N/A:L", "version": "3.1"}, "exploitabilityScore": 1.3, "impactScore": 2.5, "source": "security-advisories@github.com", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 6.6, "baseSeverity": "MEDIUM", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.3, "impactScore": 5.2, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2023-12-05T00:15:08.737", "references": [{"source": "security-advisories@github.com", "url": "http://www.openwall.com/lists/oss-security/2023/12/08/1"}, {"source": "security-advisories@github.com", "tags": ["Patch"], "url": "https://github.com/fish-shell/fish-shell/commit/09986f5563e31e2c900a606438f1d60d008f3a14"}, {"source": "security-advisories@github.com", "tags": ["Exploit", "Vendor Advisory"], "url": "https://github.com/fish-shell/fish-shell/security/advisories/GHSA-2j9r-pm96-wp4f"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "http://www.openwall.com/lists/oss-security/2023/12/08/1"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://github.com/fish-shell/fish-shell/commit/09986f5563e31e2c900a606438f1d60d008f3a14"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Exploit", "Vendor Advisory"], "url": "https://github.com/fish-shell/fish-shell/security/advisories/GHSA-2j9r-pm96-wp4f"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-436"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

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