Vulnerability-Lookup

GHSA-5RW4-4665-CVWF

Vulnerability from github – Published: 2026-08-18 20:48 – Updated: 2026-08-18 20:48

Summary

Froxlor DomainZones.add allows DNS zone-file RR injection via record/type fields

Details

Froxlor's DomainZones.add API command accepts user-controlled DNS record and type values and later writes them into generated BIND zone files without rejecting line delimiters, tab characters, or zone-file comment delimiters.

The stronger variant is in record. An authenticated customer with DNS-zone permissions can submit a normal A record request where record is:

www\t60\tIN\tA\t6.6.6.6 ;\n@

with type=A and content=127.0.0.1. The current record flow trims/lower-cases/IDNA-encodes the value, but does not reject CR/LF/HTAB or semicolon. The real Froxlor\Dns\DnsEntry::__toString() sink renders it as:

www 60 in a 6.6.6.6 ; @ 18000 IN A 127.0.0.1

BIND accepts the generated zone file:

named-checkzone example.com froxlor_dns_record_injected.zone zone example.com/IN: loaded serial 2026060501 OK

named-compilezone -D confirms both records are parsed as real DNS RRs:

example.com. 18000 IN A 127.0.0.1 www.example.com. 60 IN A 6.6.6.6 zone example.com/IN: loaded serial 2026060501 OK

Affected code in 2.3.7: - lib/Froxlor/Api/Commands/DomainZones.php:92-93 reads record/type from API params. - lib/Froxlor/Api/Commands/DomainZones.php:122-136 trims/lower-cases/IDNA-encodes record without control-character rejection. - lib/Froxlor/Api/Commands/DomainZones.php:157-160 hardens content only. - lib/Froxlor/Api/Commands/DomainZones.php:314-321 and 347-357 store record/type/content into domain_dns_entries. - lib/Froxlor/Dns/Dns.php:297 passes stored values to DnsEntry. - lib/Froxlor/Dns/DnsEntry.php:83 concatenates record/type/content into a zone-file line.

There is also a related type-field variant because type is not allowlisted and domain_dns_entries.type is varchar(10). The value NS\tns.\n@\tA renders one submitted entry as multiple zone-file records.

Impact: authenticated customer with DNS-zone permissions can inject additional BIND resource-record lines into the generated zone file for a domain they can manage in Froxlor, bypassing Froxlor's DNS field-level validation. This is DNS zone integrity loss and possible DNS availability impact inside the caller's manageable zone.

Suggested remediation: allowlist DNS RR types, reject CR/LF/HTAB/control chars/spaces/semicolon in record and type, validate record as a DNS owner name while allowing intended cases such as @, , .label, _service._proto, _dmarc, and DKIM selectors. Add defense-in-depth in DnsEntry or the DNS serializer so CR/LF cannot reach generated zone lines.

Attribution: Yaohui Wang.

Severity

5.4 (Medium)


                  
                    CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L

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{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 2.3.7"
      },
      "package": {
        "ecosystem": "Packagist",
        "name": "froxlor/froxlor"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.3.8"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-54543"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-20",
      "CWE-74"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-08-18T20:48:04Z",
    "nvd_published_at": null,
    "severity": "MODERATE"
  },
  "details": "Froxlor\u0027s DomainZones.add API command accepts user-controlled DNS record and type values and later writes them into generated BIND zone files without rejecting line delimiters, tab characters, or zone-file comment delimiters.\n\nThe stronger variant is in record. An authenticated customer with DNS-zone permissions can submit a normal A record request where record is:\n\nwww\\t60\\tIN\\tA\\t6.6.6.6 ;\\n@\n\nwith type=A and content=127.0.0.1. The current record flow trims/lower-cases/IDNA-encodes the value, but does not reject CR/LF/HTAB or semicolon. The real Froxlor\\Dns\\DnsEntry::__toString() sink renders it as:\n\nwww    60    in    a    6.6.6.6 ;\n@      18000 IN    A    127.0.0.1\n\nBIND accepts the generated zone file:\n\nnamed-checkzone example.com froxlor_dns_record_injected.zone\nzone example.com/IN: loaded serial 2026060501\nOK\n\nnamed-compilezone -D confirms both records are parsed as real DNS RRs:\n\nexample.com.       18000 IN A 127.0.0.1\nwww.example.com.      60 IN A 6.6.6.6\nzone example.com/IN: loaded serial 2026060501\nOK\n\nAffected code in 2.3.7:\n- lib/Froxlor/Api/Commands/DomainZones.php:92-93 reads record/type from API params.\n- lib/Froxlor/Api/Commands/DomainZones.php:122-136 trims/lower-cases/IDNA-encodes record without control-character rejection.\n- lib/Froxlor/Api/Commands/DomainZones.php:157-160 hardens content only.\n- lib/Froxlor/Api/Commands/DomainZones.php:314-321 and 347-357 store record/type/content into domain_dns_entries.\n- lib/Froxlor/Dns/Dns.php:297 passes stored values to DnsEntry.\n- lib/Froxlor/Dns/DnsEntry.php:83 concatenates record/type/content into a zone-file line.\n\nThere is also a related type-field variant because type is not allowlisted and domain_dns_entries.type is varchar(10). The value NS\\tns.\\n@\\tA renders one submitted entry as multiple zone-file records.\n\nImpact: authenticated customer with DNS-zone permissions can inject additional BIND resource-record lines into the generated zone file for a domain they can manage in Froxlor, bypassing Froxlor\u0027s DNS field-level validation. This is DNS zone integrity loss and possible DNS availability impact inside the caller\u0027s manageable zone.\n\nSuggested remediation: allowlist DNS RR types, reject CR/LF/HTAB/control chars/spaces/semicolon in record and type, validate record as a DNS owner name while allowing intended cases such as @, *, *.label, _service._proto, _dmarc, and DKIM selectors. Add defense-in-depth in DnsEntry or the DNS serializer so CR/LF cannot reach generated zone lines.\n\nAttribution: Yaohui Wang.",
  "id": "GHSA-5rw4-4665-cvwf",
  "modified": "2026-08-18T20:48:04Z",
  "published": "2026-08-18T20:48:04Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/froxlor/froxlor/security/advisories/GHSA-5rw4-4665-cvwf"
    },
    {
      "type": "WEB",
      "url": "https://github.com/froxlor/froxlor/commit/a4f09f09fa71337b6cdff364d0a641d631a0130a"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/froxlor/froxlor"
    },
    {
      "type": "WEB",
      "url": "https://github.com/froxlor/froxlor/releases/tag/2.3.8"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Froxlor DomainZones.add allows DNS zone-file RR injection via record/type fields"
}

CVE-2026-54543 (GCVE-0-2026-54543)

Vulnerability from cvelistv5 – Published: 2026-08-18 20:12 – Updated: 2026-08-19 13:14

Title

Froxlor DomainZones.add allows DNS zone-file RR injection via record/type fields

Summary

Froxlor is open source server administration software. Prior to 2.3.8, the DomainZones.add API command in lib/Froxlor/Api/Commands/DomainZones.php accepts user-controlled record and type values without rejecting line delimiters, tab characters, semicolons, or unsupported DNS record types before lib/Froxlor/Dns/DnsEntry.php serializes the values into a BIND zone file. An authenticated customer with DNS-zone permissions can place a crafted value in the record field, or use the related type-field variant, to create additional resource-record lines that bypass Froxlor's field-level validation. BIND accepts the injected records, allowing modification of DNS data and possible DNS availability impact within a zone the caller is authorized to manage. This issue is fixed in version 2.3.8.

Severity

5.4 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-19 13:13 UTC

CWE

CWE-74 - Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')

Assigner

GitHub_M mitre root

References

3 references

URL	Tags
https://github.com/froxlor/froxlor/security/advis…	x_refsource_CONFIRM
https://github.com/froxlor/froxlor/commit/a4f09f0…	x_refsource_MISC
https://github.com/froxlor/froxlor/releases/tag/2.3.8	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
froxlor	froxlor	Affected: < 2.3.8

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JSON

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{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-54543",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-08-19T13:13:55.628339Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-08-19T13:14:03.622Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "froxlor",
          "vendor": "froxlor",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 2.3.8"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Froxlor is open source server administration software. Prior to 2.3.8, the DomainZones.add API command in lib/Froxlor/Api/Commands/DomainZones.php accepts user-controlled record and type values without rejecting line delimiters, tab characters, semicolons, or unsupported DNS record types before lib/Froxlor/Dns/DnsEntry.php serializes the values into a BIND zone file. An authenticated customer with DNS-zone permissions can place a crafted value in the record field, or use the related type-field variant, to create additional resource-record lines that bypass Froxlor\u0027s field-level validation. BIND accepts the injected records, allowing modification of DNS data and possible DNS availability impact within a zone the caller is authorized to manage. This issue is fixed in version 2.3.8."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "LOW",
            "baseScore": 5.4,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "LOW",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-74",
              "description": "CWE-74: Improper Neutralization of Special Elements in Output Used by a Downstream Component (\u0027Injection\u0027)",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-18T20:12:12.161Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/froxlor/froxlor/security/advisories/GHSA-5rw4-4665-cvwf",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/froxlor/froxlor/security/advisories/GHSA-5rw4-4665-cvwf"
        },
        {
          "name": "https://github.com/froxlor/froxlor/commit/a4f09f09fa71337b6cdff364d0a641d631a0130a",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/froxlor/froxlor/commit/a4f09f09fa71337b6cdff364d0a641d631a0130a"
        },
        {
          "name": "https://github.com/froxlor/froxlor/releases/tag/2.3.8",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/froxlor/froxlor/releases/tag/2.3.8"
        }
      ],
      "source": {
        "advisory": "GHSA-5rw4-4665-cvwf",
        "discovery": "UNKNOWN"
      },
      "title": "Froxlor DomainZones.add allows DNS zone-file RR injection via record/type fields"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-54543",
    "datePublished": "2026-08-18T20:12:12.161Z",
    "dateReserved": "2026-06-15T19:04:14.455Z",
    "dateUpdated": "2026-08-19T13:14:03.622Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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