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{"cveTags": [], "descriptions": [{"lang": "en", "value": "Varnish Cache before 7.3.2 and 7.4.x before 7.4.3 (and before 6.0.13 LTS), and Varnish Enterprise 6 before 6.0.12r6, allows credits exhaustion for an HTTP/2 connection control flow window, aka a Broke Window Attack."}, {"lang": "es", "value": "Varnish Cache anterior a 7.3.2 y 7.4.x anterior a 7.4.3 (y anterior a 6.0.13 LTS), y Varnish Enterprise 6 anterior a 6.0.12r6, permite el agotamiento de los cr\u00e9ditos para una ventana de flujo de control de conexi\u00f3n HTTP/2, tambi\u00e9n conocido como ataque de ventana rota."}], "id": "CVE-2024-30156", "lastModified": "2026-04-15T00:35:42.020", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}, "published": "2024-03-24T01:15:45.530", "references": [{"source": "cve@mitre.org", "url": "https://varnish-cache.org/docs/7.5/whats-new/changes-7.5.html#security"}, {"source": "cve@mitre.org", "url": "https://varnish-cache.org/security/VSV00014.html"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://varnish-cache.org/docs/7.5/whats-new/changes-7.5.html#security"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://varnish-cache.org/security/VSV00014.html"}], "sourceIdentifier": "cve@mitre.org", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-770"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"affected_release": [{"advisory": "RHSA-2024:1690", "cpe": "cpe:/a:redhat:enterprise_linux:8", "package": "varnish:6-8090020240328195416.a75119d5", "product_name": "Red Hat Enterprise Linux 8", "release_date": "2024-04-08T00:00:00Z"}, {"advisory": "RHSA-2024:4937", "cpe": "cpe:/a:redhat:rhel_aus:8.2", "package": "varnish:6-8020020240528095801.4cda2c84", "product_name": "Red Hat Enterprise Linux 8.2 Advanced Update Support", "release_date": "2024-07-31T00:00:00Z"}, {"advisory": "RHSA-2024:2938", "cpe": "cpe:/a:redhat:rhel_aus:8.4", "package": "varnish:6-8040020240513125037.522a0ee4", "product_name": "Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support", "release_date": "2024-05-21T00:00:00Z"}, {"advisory": "RHSA-2024:2938", "cpe": "cpe:/a:redhat:rhel_tus:8.4", "package": "varnish:6-8040020240513125037.522a0ee4", "product_name": "Red Hat Enterprise Linux 8.4 Telecommunications Update Service", "release_date": "2024-05-21T00:00:00Z"}, {"advisory": "RHSA-2024:2938", "cpe": "cpe:/a:redhat:rhel_e4s:8.4", "package": "varnish:6-8040020240513125037.522a0ee4", "product_name": "Red Hat Enterprise Linux 8.4 Update Services for SAP Solutions", "release_date": "2024-05-21T00:00:00Z"}, {"advisory": "RHSA-2024:3426", "cpe": "cpe:/a:redhat:rhel_eus:8.6", "package": "varnish:6-8060020240520091547.ad008a3a", "product_name": "Red Hat Enterprise Linux 8.6 Extended Update Support", "release_date": "2024-05-28T00:00:00Z"}, {"advisory": "RHSA-2024:3305", "cpe": "cpe:/a:redhat:rhel_eus:8.8", "package": "varnish:6-8080020240510134818.63b34585", "product_name": "Red Hat Enterprise Linux 8.8 Extended Update Support", "release_date": "2024-05-23T00:00:00Z"}, {"advisory": "RHSA-2024:1691", "cpe": "cpe:/a:redhat:enterprise_linux:9", "package": "varnish-0:6.6.2-4.el9_3.1", "product_name": "Red Hat Enterprise Linux 9", "release_date": "2024-04-08T00:00:00Z"}, {"advisory": "RHSA-2024:2700", "cpe": "cpe:/a:redhat:rhel_eus:9.0", "package": "varnish-0:6.6.2-2.el9_0.3", "product_name": "Red Hat Enterprise Linux 9.0 Extended Update Support", "release_date": "2024-05-06T00:00:00Z"}, {"advisory": "RHSA-2024:2820", "cpe": "cpe:/a:redhat:rhel_eus:9.2", "package": "varnish-0:6.6.2-3.el9_2.2", "product_name": "Red Hat Enterprise Linux 9.2 Extended Update Support", "release_date": "2024-05-13T00:00:00Z"}, {"advisory": "RHSA-2024:1689", "cpe": "cpe:/a:redhat:rhel_software_collections:3::el7", "package": "rh-varnish6-varnish-0:6.0.13-1.el7", "product_name": "Red Hat Software Collections for Red Hat Enterprise Linux 7", "release_date": "2024-04-08T00:00:00Z"}, {"advisory": "RHSA-2024:1689", "cpe": "cpe:/a:redhat:rhel_software_collections:3::el7", "package": "rh-varnish6-varnish-modules-0:0.15.0-8.el7", "product_name": "Red Hat Software Collections for Red Hat Enterprise Linux 7", "release_date": "2024-04-08T00:00:00Z"}], "bugzilla": {"description": "varnish: HTTP/2 Broken Window Attack may result in denial of service", "id": "2271486", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2271486"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.5", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "status": "verified"}, "cwe": "CWE-400", "details": ["Varnish Cache before 7.3.2 and 7.4.x before 7.4.3 (and before 6.0.13 LTS), and Varnish Enterprise 6 before 6.0.12r6, allows credits exhaustion for an HTTP/2 connection control flow window, aka a Broke Window Attack.", "A flaw was found in the Varnish cache server, with HTTP/2 support enabled, that may allow a Denial of Service type of attack. A malicious actor can cause the server to run out of credits during the HTTP/2 connection control flow. As a consequence, the server will stop to properly process the active HTTP streams, retaining the already allocated resources, leading to resource starvation."], "mitigation": {"lang": "en:us", "value": "A possible mitigation for this issue is to disable http2 support until the package can be updated.\nThis can be performed by running the following command:\n~~~\nvarnishadm param.set feature -http2\n~~~\nNote: you must remove `h2` from the list of protocols if your TLS terminator is advertising it with ALPN.\nIt's also possible to use the `MAIN.sc_bankrupt` counter to monitor possible on-going attacks to the varnish server."}, "name": "CVE-2024-30156", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "varnish", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "varnish-modules", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "varnish-modules", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:rhel_software_collections:3", "fix_state": "Not affected", "package_name": "rh-varnish6-jemalloc", "product_name": "Red Hat Software Collections"}], "public_date": "2024-03-24T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2024-30156\nhttps://nvd.nist.gov/vuln/detail/CVE-2024-30156\nhttps://varnish-cache.org/security/VSV00014.html"], "statement": "CVE-2024-30156 represents a important severity issue due to its potential to cause widespread denial of service (DoS) across Varnish Cacher servers with HTTP/2 protocol enabled. By exploiting this vulnerability, attackers can exhaust the server's HTTP/2 connection control flow window credits, thereby halting the processing of streams and indefinitely retaining associated resources. This can lead to a complete service outage, impacting the availability and performance of web services relying on Varnish Cache. Given the prevalence of HTTP/2 adoption for its performance benefits, the vulnerability poses a significant risk to web infrastructure, necessitating immediate mitigation measures to prevent exploitation and mitigate the impact on affected systems.", "threat_severity": "Important"}

{}