LibreNMS: Stored XSS via graph_descr admin config settings echoed without escaping to all authenticated users
The advisory, in context
Summary
The graph_descr.<graphtype> family of settings is echoed verbatim without htmlspecialchars() in includes/html/pages/graphs.inc.php:194. Any admin can store a malicious HTML payload that executes in every authenticated user's browser viewing that graph type.
CVSS
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N — 4.8 Medium
Details
// graphs.inc.php:194
echo LibrenmsConfig::get('graph_descr.' . $vars['type']);
PoC
PUT /settings/graph_descr.device_processor
{"value": "<img src=x onerror=\"alert('ADV-15')\">"}
GET /graphs?type=device_processor
→ <img src=x onerror="alert('ADV-15')">
Fix
echo htmlspecialchars(LibrenmsConfig::get('graph_descr.' . $vars['type']), ENT_QUOTES, 'UTF-8');
Prerequisite
Admin session to set the config value.
Affected packages
Start with the recorded fix for your release branch. Check your installed version and test compatibility before upgrading. Fixing this advisory does not rule out other vulnerabilities in the release.
Earlier releases before 26.7.0
Fixed in 26.7.0
158 explicitly affected versions
1.19, 1.20, 1.20.1, 1.21, 1.22, 1.22.01, 1.23, 1.24, 1.25, 1.26, 1.27, 1.28, 1.29, 1.30, 1.30.01, 1.31, 1.31.01, 1.31.02, 1.31.03, 1.32, 1.32.01, 1.33, 1.33.01, 1.34, 1.35, 1.36, 1.36.01, 1.37, 1.38, 1.39, 1.40, 1.41, 1.42, 1.42.01, 1.43, 1.44, 1.45, 1.46, 1.47, 1.48, 1.48.1, 1.49, 1.50, 1.50.1, 1.51, 1.52, 1.53, 1.53.1, 1.54, 1.55, 1.56, 1.57, 1.58, 1.58.1, 1.59, 1.60, 1.61, 1.62, 1.62.1, 1.62.2, 1.63, 1.64, 1.64.1, 1.65, 1.65.1, 1.66, 1.67, 1.68, 1.69, 1.70.0, 1.70.1, 21.1.0, 21.10.0, 21.10.1, 21.10.2, 21.11.0, 21.12.0, 21.12.1, 21.2.0, 21.3.0, 21.4.0, 21.5.0, 21.5.1, 21.6.0, 21.7.0, 21.8.0, 21.9.0, 21.9.1, 22.1.0, 22.10.0, 22.11.0, 22.12.0, 22.2.0, 22.2.1, 22.2.2, 22.3.0, 22.4.0, 22.4.1, 22.5.0, 22.6.0, 22.7.0, 22.8.0, 22.9.0, 23.1.0, 23.1.1, 23.10.0, 23.11.0, 23.2.0, 23.4.0, 23.4.1, 23.5.0, 23.6.0, 23.7.0, 23.8.0, 23.8.1, 23.8.2, 23.9.0, 23.9.1, 24.1.0, 24.10.0, 24.10.1, 24.11.0, 24.12.0, 24.2.0, 24.3.0, 24.4.0, 24.4.1, 24.5.0, 24.6.0, 24.7.0, 24.8.0, 24.8.1, 24.9.0, 24.9.1, 25.1.0, 25.10.0, 25.11.0, 25.12.0, 25.2.0, 25.3.0, 25.4.0, 25.5.0, 25.6.0, 25.7.0, 25.8.0, 25.9.0, 25.9.1, 26.1.0, 26.1.1, 26.2.0, 26.3.0, 26.3.1, 26.4.0, 26.4.1, 26.5.0, 26.5.1, 26.6.0, 26.6.1
View affected-version evidence
{
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "26.7.0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.19",
"1.20",
"1.20.1",
"1.21",
"1.22",
"1.22.01",
"1.23",
"1.24",
"1.25",
"1.26",
"1.27",
"1.28",
"1.29",
"1.30",
"1.30.01",
"1.31",
"1.31.01",
"1.31.02",
"1.31.03",
"1.32",
"1.32.01",
"1.33",
"1.33.01",
"1.34",
"1.35",
"1.36",
"1.36.01",
"1.37",
"1.38",
"1.39",
"1.40",
"1.41",
"1.42",
"1.42.01",
"1.43",
"1.44",
"1.45",
"1.46",
"1.47",
"1.48",
"1.48.1",
"1.49",
"1.50",
"1.50.1",
"1.51",
"1.52",
"1.53",
"1.53.1",
"1.54",
"1.55",
"1.56",
"1.57",
"1.58",
"1.58.1",
"1.59",
"1.60",
"1.61",
"1.62",
"1.62.1",
"1.62.2",
"1.63",
"1.64",
"1.64.1",
"1.65",
"1.65.1",
"1.66",
"1.67",
"1.68",
"1.69",
"1.70.0",
"1.70.1",
"21.1.0",
"21.10.0",
"21.10.1",
"21.10.2",
"21.11.0",
"21.12.0",
"21.12.1",
"21.2.0",
"21.3.0",
"21.4.0",
"21.5.0",
"21.5.1",
"21.6.0",
"21.7.0",
"21.8.0",
"21.9.0",
"21.9.1",
"22.1.0",
"22.10.0",
"22.11.0",
"22.12.0",
"22.2.0",
"22.2.1",
"22.2.2",
"22.3.0",
"22.4.0",
"22.4.1",
"22.5.0",
"22.6.0",
"22.7.0",
"22.8.0",
"22.9.0",
"23.1.0",
"23.1.1",
"23.10.0",
"23.11.0",
"23.2.0",
"23.4.0",
"23.4.1",
"23.5.0",
"23.6.0",
"23.7.0",
"23.8.0",
"23.8.1",
"23.8.2",
"23.9.0",
"23.9.1",
"24.1.0",
"24.10.0",
"24.10.1",
"24.11.0",
"24.12.0",
"24.2.0",
"24.3.0",
"24.4.0",
"24.4.1",
"24.5.0",
"24.6.0",
"24.7.0",
"24.8.0",
"24.8.1",
"24.9.0",
"24.9.1",
"25.1.0",
"25.10.0",
"25.11.0",
"25.12.0",
"25.2.0",
"25.3.0",
"25.4.0",
"25.5.0",
"25.6.0",
"25.7.0",
"25.8.0",
"25.9.0",
"25.9.1",
"26.1.0",
"26.1.1",
"26.2.0",
"26.3.0",
"26.3.1",
"26.4.0",
"26.4.1",
"26.5.0",
"26.5.1",
"26.6.0",
"26.6.1"
]
}