{
"id": "GHSA-hxmp-pqch-c8mm",
"aliases": [
"CVE-2020-26257"
],
"details": "### Impact\n\nA malicious or poorly-implemented homeserver can inject malformed events into a room by specifying a different room id in the path of a `/send_join`, `/send_leave`, `/invite` or `/exchange_third_party_invite` request.\n\nThis can lead to a denial of service in which future events will not be correctly sent to other servers over federation.\n\nThis affects any server which accepts federation requests from untrusted servers.\n\n### Patches\n\nIssue is resolved by https://github.com/matrix-org/synapse/pull/8776.\n\n### Workarounds\n\nHomeserver administrators could limit access to the federation API to trusted servers (for example via `federation_domain_whitelist`).",
"summary": "Denial of service attack via incorrect parameters in Matrix Synapse",
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1.23.1"
}
]
}
],
"package": {
"name": "matrix-synapse",
"ecosystem": "PyPI"
}
}
],
"modified": "2024-09-24T17:44:50Z",
"severity": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"
},
{
"type": "CVSS_V4",
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N"
}
],
"published": "2020-12-09T18:21:29Z",
"references": [
{
"url": "https://github.com/matrix-org/synapse/security/advisories/GHSA-hxmp-pqch-c8mm",
"type": "WEB"
},
{
"url": "https://nvd.nist.gov/vuln/detail/CVE-2020-26257",
"type": "ADVISORY"
},
{
"url": "https://github.com/matrix-org/synapse/pull/8776",
"type": "WEB"
},
{
"url": "https://github.com/matrix-org/synapse/commit/3ce2f303f15f6ac3dc352298972dc6e04d9b7a8b",
"type": "WEB"
},
{
"url": "https://github.com/matrix-org/synapse/blob/develop/CHANGES.md#synapse-1231-2020-12-09",
"type": "WEB"
},
{
"url": "https://github.com/pypa/advisory-database/tree/main/vulns/matrix-synapse/PYSEC-2020-236.yaml",
"type": "WEB"
},
{
"url": "https://lists.fedoraproject.org/archives/list/[email protected] /message/DBTIU3ZNBFWZ56V4X7JIAD33V5H2GOMC",
"type": "WEB"
},
{
"url": "https://lists.fedoraproject.org/archives/list/[email protected] /message/QR4MMYZKX5N5GYGH4H5LBUUC5TLAFHI7",
"type": "WEB"
}
],
"schema_version": "1.4.0",
"database_specific": {
"cwe_ids": [
"CWE-400",
"CWE-74",
"CWE-79"
],
"severity": "HIGH",
"github_reviewed": true,
"nvd_published_at": "2020-12-09T19:15:00Z",
"github_reviewed_at": "2020-12-09T18:21:17Z"
}
}