{
"id": "GHSA-2xhg-w2g5-w95x",
"aliases": [
"CVE-2021-41270"
],
"details": "Description\n-----------\n\nCSV Injection, also known as Formula Injection, occurs when websites embed untrusted input inside CSV files. When a spreadsheet program opens a CSV, any cell starting with `=` is interpreted by the software as a formula and could be abused by an attacker.\n\nIn Symfony 4.1, we've added the opt-in `csv_escape_formulas` option in `CsvEncoder`, to prefix all cells starting by `=`, `+`, `-` or `@` by a tab `\\t`. \n\nSince then, OWASP added 2 chars in that list: \n- Tab (0x09)\n- Carriage return (0x0D)\n\nThis makes our previous prefix char (Tab `\\t`) part of the vulnerable characters, and [OWASP suggests](https://owasp.org/www-community/attacks/CSV_Injection) using the single quote `'` for prefixing the value.\n\nResolution\n----------\n\nSymfony now follows the OWASP recommendations and use the single quote `'` to prefix formulas and adds the prefix to cells starting by `\\t`, `\\r` as well as `=`, `+`, `-` and `@`.\n\nThe patch for this issue is available [here](https://github.com/symfony/symfony/commit/3da6f2d45e7536ccb2a26f52fbaf340917e208a8) for branch 4.4.\n\nCredits\n-------\n\nWe would like to thank Jake Barwell for reporting the issue and Jérémy Derussé for fixing the issue.\n",
"summary": "CSV Injection in symfony/serializer",
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "5.0.0"
},
{
"fixed": "5.3.12"
}
]
}
],
"package": {
"name": "symfony/serializer",
"ecosystem": "Packagist"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "4.1.0"
},
{
"fixed": "4.4.35"
}
]
}
],
"package": {
"name": "symfony/serializer",
"ecosystem": "Packagist"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "4.1.0"
},
{
"fixed": "4.4.35"
}
]
}
],
"package": {
"name": "symfony/symfony",
"ecosystem": "Packagist"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "5.0.0"
},
{
"fixed": "5.3.12"
}
]
}
],
"package": {
"name": "symfony/symfony",
"ecosystem": "Packagist"
}
}
],
"modified": "2024-02-05T11:14:05Z",
"severity": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N"
}
],
"published": "2021-11-24T21:01:23Z",
"references": [
{
"url": "https://github.com/symfony/symfony/security/advisories/GHSA-2xhg-w2g5-w95x",
"type": "WEB"
},
{
"url": "https://nvd.nist.gov/vuln/detail/CVE-2021-41270",
"type": "ADVISORY"
},
{
"url": "https://github.com/symfony/symfony/pull/44243",
"type": "WEB"
},
{
"url": "https://github.com/symfony/symfony/commit/3da6f2d45e7536ccb2a26f52fbaf340917e208a8",
"type": "WEB"
},
{
"url": "https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/serializer/CVE-2021-41270.yaml",
"type": "WEB"
},
{
"url": "https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/symfony/CVE-2021-41270.yaml",
"type": "WEB"
},
{
"url": "https://github.com/symfony/symfony",
"type": "PACKAGE"
},
{
"url": "https://github.com/symfony/symfony/releases/tag/v5.3.12",
"type": "WEB"
},
{
"url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/3BPT4SF6SIXFMZARDWED5T32J7JEH3EP",
"type": "WEB"
},
{
"url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QSREFD2TJT5LWKM6S4MD3W26NQQ5WJUP",
"type": "WEB"
},
{
"url": "https://lists.fedoraproject.org/archives/list/[email protected] /message/3BPT4SF6SIXFMZARDWED5T32J7JEH3EP",
"type": "WEB"
},
{
"url": "https://lists.fedoraproject.org/archives/list/[email protected] /message/QSREFD2TJT5LWKM6S4MD3W26NQQ5WJUP",
"type": "WEB"
},
{
"url": "https://symfony.com/cve-2021-41270",
"type": "WEB"
}
],
"schema_version": "1.4.0",
"database_specific": {
"cwe_ids": [
"CWE-1236"
],
"severity": "MODERATE",
"github_reviewed": true,
"nvd_published_at": "2021-11-24T19:15:00Z",
"github_reviewed_at": "2021-11-24T20:04:02Z"
}
}