{"dataType": "CVE_RECORD", "cveMetadata": {"cveId": "CVE-2024-1931", "assignerOrgId": "206fc3a0-e175-490b-9eaa-a5738056c9f6", "state": "PUBLISHED", "assignerShortName": "NLnet Labs", "dateReserved": "2024-02-27T13:43:18.777Z", "datePublished": "2024-03-07T09:17:13.072Z", "dateUpdated": "2024-08-28T20:43:00.408Z"}, "containers": {"cna": {"title": "Denial of service when trimming EDE text on positive replies", "datePublic": "2024-03-07T00:00:00.000Z", "affected": [{"vendor": "NLnet Labs", "product": "Unbound", "versions": [{"version": "1.18.0", "status": "affected", "lessThan": "1.19.2", "versionType": "semver"}], "defaultStatus": "unaffected"}], "descriptions": [{"lang": "en", "value": "NLnet Labs Unbound version 1.18.0 up to and including version 1.19.1 contain a vulnerability that can cause denial of service by a certain code path that can lead to an infinite loop. 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For the vulnerable versions 1.18.0 up to and including 1.19.1, the option 'ede: no' (default configuration) is also a solution as it does not exercise the vulnerable code path."}], "datePublic": "2024-03-07T00:00:00.000Z", "references": [{"url": "https://www.nlnetlabs.nl/downloads/unbound/CVE-2024-1931.txt", "tags": ["vendor-advisory"]}, {"url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/4VCBRQ7KMSIGBQ6A4SBL5PF326DIJIIV/"}, {"url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/B2JUIFPA7H75Q2W3VXW2TUNHK6NVGOX4/"}, {"url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/RBR4H7RCVMJ6H76S4LLRSY5EBFTYWGXK/"}, {"url": "https://lists.freebsd.org/archives/freebsd-security/2024-July/000283.html"}, {"url": "https://security.netapp.com/advisory/ntap-20240705-0006/"}], "descriptions": [{"lang": "en", "value": "NLnet Labs Unbound version 1.18.0 up to and including version 1.19.1 contain a vulnerability that can cause denial of service by a certain code path that can lead to an infinite loop. 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Unbound 1.18.0 introduced a feature that removes EDE records from responses with size higher than the client's advertised buffer size. Before removing all the EDE records however, it would try to see if trimming the extra text fields on those records would result in an acceptable size while still retaining the EDE codes. Due to an unchecked condition, the code that trims the text of the EDE records could loop indefinitely. This happens when Unbound would reply with attached EDE information on a positive reply and the client's buffer size is smaller than the needed space to include EDE records. The vulnerability can only be triggered when the 'ede: yes' option is used; non default configuration. From version 1.19.2 on, the code is fixed to avoid looping indefinitely."}, {"lang": "es", "value": "NLnet Labs Unbound versi\u00f3n 1.18.0 hasta la versi\u00f3n 1.19.1 incluida contiene una vulnerabilidad que puede causar denegaci\u00f3n de servicio mediante una determinada ruta de c\u00f3digo que puede conducir a un bucle infinito. Unbound 1.18.0 introdujo una caracter\u00edstica que elimina los registros EDE de las respuestas con un tama\u00f1o superior al tama\u00f1o de b\u00fafer anunciado por el cliente. Sin embargo, antes de eliminar todos los registros EDE, intentar\u00eda ver si recortar los campos de texto adicionales en esos registros dar\u00eda como resultado un tama\u00f1o aceptable y al mismo tiempo conservar\u00eda los c\u00f3digos EDE. Debido a una condici\u00f3n no marcada, el c\u00f3digo que recorta el texto de los registros EDE podr\u00eda repetirse indefinidamente. Esto sucede cuando Unbound responde con informaci\u00f3n EDE adjunta en una respuesta positiva y el tama\u00f1o del b\u00fafer del cliente es menor que el espacio necesario para incluir registros EDE. La vulnerabilidad s\u00f3lo puede activarse cuando se utiliza la opci\u00f3n 'ede: yes'; configuraci\u00f3n no predeterminada. 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{"bugzilla": {"description": "unbound: Infinite loop due to improper EDE message size check", "id": "2268418", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2268418"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.9", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-835", "details": ["NLnet Labs Unbound version 1.18.0 up to and including version 1.19.1 contain a vulnerability that can cause denial of service by a certain code path that can lead to an infinite loop. Unbound 1.18.0 introduced a feature that removes EDE records from responses with size higher than the client's advertised buffer size. Before removing all the EDE records however, it would try to see if trimming the extra text fields on those records would result in an acceptable size while still retaining the EDE codes. Due to an unchecked condition, the code that trims the text of the EDE records could loop indefinitely. This happens when Unbound would reply with attached EDE information on a positive reply and the client's buffer size is smaller than the needed space to include EDE records. The vulnerability can only be triggered when the 'ede: yes' option is used; non default configuration. From version 1.19.2 on, the code is fixed to avoid looping indefinitely.", "A vulnerability was found in Unbound. The issue arises due to a flaw in the handling of Extended DNS Error (EDE) records when the 'ede: yes' option is enabled, a non-default configuration. Specifically, an unchecked condition in the code can trigger an infinite loop when attempting to trim the text fields of EDE records to fit within the client's buffer size. This vulnerability could potentially lead to denial of service (DoS) as the infinite loop consumes system resources, impacting the availability of the Unbound DNS resolver."], "mitigation": {"lang": "en:us", "value": "Mitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability."}, "name": "CVE-2024-1931", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "unbound", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "unbound", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "unbound", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "unbound", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2024-03-07T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2024-1931\nhttps://nvd.nist.gov/vuln/detail/CVE-2024-1931"], "statement": "The vulnerability present in Unbound, while posing a risk of denial of service, is assessed as having a Moderate severity level from a technical perspective. The severity is primarily attributed to the potential for exploitation under specific conditions, namely when the 'ede: yes' option is enabled, which is not the default configuration. Additionally, the vulnerability manifests in a limited scenario where responses containing Extended DNS Error (EDE) records exceed the client's buffer size. While the issue can result in an infinite loop and consequent denial of service, its impact is constrained to situations where these specific conditions align.", "threat_severity": "Moderate", "upstream_fix": "unbound 1.19.2"}