Vulnerability-Lookup

OXDC-ADV-2024-0002

Vulnerability from csaf_ox - Published: 2024-09-09 22:00 - Updated: 2024-09-10 00:00

Summary

OX Dovecot Pro Security Advisory OXDC-ADV-2024-0002

Severity

Medium

CVE-2024-23184

5.0 (Medium)


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

CWE-770 - Allocation of Resources Without Limits or Throttling

Affected products

Last affected 1 product

Product	Identifier	Version	Remediation
OX Dovecot Pro core 2.3.21 Open-Xchange GmbH / OX Dovecot Pro core	`cpe:2.3:a:open-xchange:dovecot:2.3.21:::::::*`	2.3.21	Vendor Fix

First fixed 2 products

Product	Identifier	Version	Remediation
OX Dovecot Pro core 2.3.21.1 Open-Xchange GmbH / OX Dovecot Pro core	`cpe:2.3:a:open-xchange:dovecot:2.3.21.1:::::::*`	2.3.21.1
OX Dovecot Pro core 3.0.0 Open-Xchange GmbH / OX Dovecot Pro core	`cpe:2.3:a:open-xchange:dovecot:3.0.0:::::::*`	3.0.0

Threats

Impact An external attacker can send specially crafted messages that consume target system resources and cause outage.

Exploit Status No publicly available exploits are known.

References

4 references

URL	Category
https://documentation.open-xchange.com/dovecot/se…	self
https://documentation.open-xchange.com/dovecot/se…	self
https://documentation.open-xchange.com/dovecot/se…	self
https://documentation.open-xchange.com/dovecot/se…	self

JSON

To clipboard

{
  "document": {
    "aggregate_severity": {
      "text": "MEDIUM"
    },
    "category": "csaf_security_advisory",
    "csaf_version": "2.0",
    "distribution": {
      "tlp": {
        "label": "GREEN",
        "url": "https://www.first.org/tlp/"
      }
    },
    "lang": "en-US",
    "publisher": {
      "category": "vendor",
      "name": "Open-Xchange GmbH",
      "namespace": "https://open-xchange.com/"
    },
    "references": [
      {
        "category": "self",
        "summary": "Canonical CSAF document",
        "url": "https://documentation.open-xchange.com/dovecot/security/advisories/csaf/2024/oxdc-adv-2024-0002.json"
      },
      {
        "category": "self",
        "summary": "Markdown representation",
        "url": "https://documentation.open-xchange.com/dovecot/security/advisories/md/2024/oxdc-adv-2024-0002.md"
      },
      {
        "category": "self",
        "summary": "HTML representation",
        "url": "https://documentation.open-xchange.com/dovecot/security/advisories/html/2024/oxdc-adv-2024-0002.html"
      },
      {
        "category": "self",
        "summary": "Plain-text representation",
        "url": "https://documentation.open-xchange.com/dovecot/security/advisories/txt/2024/oxdc-adv-2024-0002.txt"
      }
    ],
    "title": "OX Dovecot Pro Security Advisory OXDC-ADV-2024-0002",
    "tracking": {
      "current_release_date": "2024-09-10T00:00:00+00:00",
      "generator": {
        "date": "2024-09-10T14:33:29+00:00",
        "engine": {
          "name": "OX CSAF",
          "version": "1.0.0"
        }
      },
      "id": "OXDC-ADV-2024-0002",
      "initial_release_date": "2024-09-10T00:00:00+02:00",
      "revision_history": [
        {
          "date": "2024-09-10T00:00:00+02:00",
          "number": "1",
          "summary": "Initial release"
        },
        {
          "date": "2024-09-10T00:00:00+02:00",
          "number": "2",
          "summary": "Public release"
        },
        {
          "date": "2024-09-10T00:00:00+02:00",
          "number": "3",
          "summary": "Public release"
        },
        {
          "date": "2024-09-10T00:00:00+00:00",
          "number": "4",
          "summary": "Public release"
        }
      ],
      "status": "final",
      "version": "4"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_version",
                "name": "2.3.21",
                "product": {
                  "name": "OX Dovecot Pro core 2.3.21",
                  "product_id": "OXDC-CORE_2.3.21",
                  "product_identification_helper": {
                    "cpe": "cpe:2.3:a:open-xchange:dovecot:2.3.21:*:*:*:*:*:*:*"
                  }
                }
              },
              {
                "category": "product_version",
                "name": "2.3.21.1",
                "product": {
                  "name": "OX Dovecot Pro core 2.3.21.1",
                  "product_id": "OXDC-CORE_2.3.21.1",
                  "product_identification_helper": {
                    "cpe": "cpe:2.3:a:open-xchange:dovecot:2.3.21.1:*:*:*:*:*:*:*"
                  }
                }
              },
              {
                "category": "product_version",
                "name": "3.0.0",
                "product": {
                  "name": "OX Dovecot Pro core 3.0.0",
                  "product_id": "OXDC-CORE_3.0.0",
                  "product_identification_helper": {
                    "cpe": "cpe:2.3:a:open-xchange:dovecot:3.0.0:*:*:*:*:*:*:*"
                  }
                }
              }
            ],
            "category": "product_name",
            "name": "OX Dovecot Pro core"
          }
        ],
        "category": "vendor",
        "name": "Open-Xchange GmbH"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2024-23184",
      "cwe": {
        "id": "CWE-770",
        "name": "Allocation of Resources Without Limits or Throttling"
      },
      "discovery_date": "2024-01-30T22:55:25+01:00",
      "ids": [
        {
          "system_name": "JIRA OX Bug",
          "text": "DOV-6464"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "Having a large number of address headers (From, To, Cc, Bcc, etc.) becomes excessively CPU intensive. With 100k header lines CPU usage is already 12 seconds, and in a production environment we observed 500k header lines taking 18 minutes to parse. Since this can be triggered by external actors sending emails to a victim, this is a security issue."
        }
      ],
      "product_status": {
        "first_fixed": [
          "OXDC-CORE_2.3.21.1",
          "OXDC-CORE_3.0.0"
        ],
        "last_affected": [
          "OXDC-CORE_2.3.21"
        ]
      },
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2024-08-30T11:32:20+02:00",
          "details": "One can implement restrictions on address headers on MTA component preceding Dovecot.",
          "product_ids": [
            "OXDC-CORE_2.3.21"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 5.0,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "LOW",
            "privilegesRequired": "LOW",
            "scope": "CHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:L/A:N",
            "version": "3.1"
          },
          "products": [
            "OXDC-CORE_2.3.21"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "An external attacker can send specially crafted messages that consume target system resources and cause outage."
        },
        {
          "category": "exploit_status",
          "details": "No publicly available exploits are known."
        }
      ],
      "title": "Excessive CPU usage with a large number of address headers"
    }
  ]
}

CVE-2024-23184 (GCVE-0-2024-23184)

Vulnerability from cvelistv5 – Published: 2024-09-10 14:33 – Updated: 2025-11-04 16:11

Summary

Having a large number of address headers (From, To, Cc, Bcc, etc.) becomes excessively CPU intensive. With 100k header lines CPU usage is already 12 seconds, and in a production environment we observed 500k header lines taking 18 minutes to parse. Since this can be triggered by external actors sending emails to a victim, this is a security issue. An external attacker can send specially crafted messages that consume target system resources and cause outage. One can implement restrictions on address headers on MTA component preceding Dovecot. No publicly available exploits are known.

Severity

5 (Medium)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2024-09-10 15:33 UTC

CWE

CWE-770 - Allocation of Resources Without Limits or Throttling

Assigner

OX mitre root

References

4 references

URL	Tags
https://documentation.open-xchange.com/dovecot/se…	vendor-advisory
http://www.openwall.com/lists/oss-security/2024/08/15/3
http://seclists.org/fulldisclosure/2024/Aug/17
https://lists.debian.org/debian-lts-announce/2024…

Impacted products

1 product

Vendor	Product	Version
Open-Xchange GmbH	OX Dovecot Pro	Affected: 0 , ≤ 2.3.21 (semver)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2025-11-04T16:11:12.830Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "url": "http://www.openwall.com/lists/oss-security/2024/08/15/3"
          },
          {
            "url": "http://seclists.org/fulldisclosure/2024/Aug/17"
          },
          {
            "url": "https://lists.debian.org/debian-lts-announce/2024/09/msg00002.html"
          }
        ],
        "title": "CVE Program Container"
      },
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2024-23184",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2024-09-10T15:33:58.049882Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2024-09-10T15:34:07.961Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "modules": [
            "core"
          ],
          "product": "OX Dovecot Pro",
          "vendor": "Open-Xchange GmbH",
          "versions": [
            {
              "lessThanOrEqual": "2.3.21",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Having a large number of address headers (From, To, Cc, Bcc, etc.) becomes excessively CPU intensive. With 100k header lines CPU usage is already 12 seconds, and in a production environment we observed 500k header lines taking 18 minutes to parse. Since this can be triggered by external actors sending emails to a victim, this is a security issue. An external attacker can send specially crafted messages that consume target system resources and cause outage. One can implement restrictions on address headers on MTA component preceding Dovecot. No publicly available exploits are known."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 5,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "LOW",
            "privilegesRequired": "LOW",
            "scope": "CHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:L/A:N",
            "version": "3.1"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-770",
              "description": "Allocation of Resources Without Limits or Throttling",
              "lang": "en",
              "type": "cwe"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2024-09-10T14:33:34.166Z",
        "orgId": "8ce71d90-2354-404b-a86e-bec2cc4e6981",
        "shortName": "OX"
      },
      "references": [
        {
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://documentation.open-xchange.com/dovecot/security/advisories/csaf/2024/oxdc-adv-2024-0002.json"
        }
      ],
      "source": {
        "defect": "DOV-6464",
        "discovery": "INTERNAL"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "8ce71d90-2354-404b-a86e-bec2cc4e6981",
    "assignerShortName": "OX",
    "cveId": "CVE-2024-23184",
    "datePublished": "2024-09-10T14:33:34.166Z",
    "dateReserved": "2024-01-12T07:03:12.862Z",
    "dateUpdated": "2025-11-04T16:11:12.830Z",
    "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.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.