{ "document": { "aggregate_severity": { "text": "High" }, "category": "csaf_vex", "csaf_version": "2.0", "distribution": { "text": "TuxCare License Agreement", "tlp": { "label": "WHITE", "url": "https://www.first.org/tlp/" } }, "lang": "en", "notes": [ { "category": "legal_disclaimer", "text": "This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Cloud Linux Inc. and provide a link to the original.", "title": "Terms of Use" } ], "publisher": { "category": "vendor", "contact_details": "https://tuxcare.com/contact/", "name": "TuxCare", "namespace": "https://tuxcare.com/" }, "references": [ { "category": "self", "summary": "Canonical URL", "url": "https://security.tuxcare.com/csaf/v2/els_os/tuxcare9.6esu/vex/2023/cve-2023-33953-els_os-tuxcare9_6esu.json" } ], "tracking": { "current_release_date": "2026-04-10T19:26:00Z", "generator": { "date": "2026-04-10T19:26:00Z", "engine": { "name": "pyCSAF" } }, "id": "CVE-2023-33953-ELS_OS-TUXCARE9.6ESU", "initial_release_date": "2023-08-09T13:15:00Z", "revision_history": [ { "date": "2023-08-09T13:15:00Z", "number": "1", "summary": "Initial version" }, { "date": "2026-04-02T08:44:13Z", "number": "2", "summary": "Official Publication" }, { "date": "2026-04-03T09:41:11Z", "number": "3", "summary": "Update document" }, { "date": "2026-04-10T19:26:00Z", "number": "4", "summary": "Update document" } ], "status": "final", "version": "4" }, "title": "Security update on CVE-2023-33953" }, "product_tree": { "branches": [ { "branches": [ { "branches": [ { "category": "product_name", "name": "AlmaLinux 9.6", "product": { "name": "AlmaLinux 9.6", "product_id": "AlmaLinux-9.6", "product_identification_helper": { "cpe": "cpe:2.3:o:almalinux:almalinux:9.6:*:*:*:*:*:*:*" } } } ], "category": "product_family", "name": "AlmaLinux" } ], "category": "vendor", "name": "AlmaLinux OS Foundation" }, { "branches": [ { "branches": [ { "category": "product_name", "name": "Rocky Linux 9.6", "product": { "name": "Rocky Linux 9.6", "product_id": "Rocky Linux-9.6", "product_identification_helper": { "cpe": "cpe:2.3:o:resf:rocky_linux:9.6:*:*:*:*:*:*:*" } } } ], "category": "product_family", "name": "Rocky Linux" } ], "category": "vendor", "name": "Rocky Linux" }, { "branches": [ { "branches": [ { 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"bind-chroot-32:9.16.23-31.el9_6.2.tuxcare.els1.x86_64 as a component of Rocky Linux 9.6", "product_id": "Rocky Linux-9.6:bind-chroot-32:9.16.23-31.el9_6.2.tuxcare.els1.x86_64" }, "product_reference": "bind-chroot-32:9.16.23-31.el9_6.2.tuxcare.els1.x86_64", "relates_to_product_reference": "Rocky Linux-9.6" }, { "category": "default_component_of", "full_product_name": { "name": "bind-doc-32:9.16.23-31.el9_6.2.tuxcare.els1.noarch as a component of Rocky Linux 9.6", "product_id": "Rocky Linux-9.6:bind-doc-32:9.16.23-31.el9_6.2.tuxcare.els1.noarch" }, "product_reference": "bind-doc-32:9.16.23-31.el9_6.2.tuxcare.els1.noarch", "relates_to_product_reference": "Rocky Linux-9.6" }, { "category": "default_component_of", "full_product_name": { "name": "bind-dnssec-utils-32:9.16.23-31.el9_6.2.tuxcare.els1.x86_64 as a component of Rocky Linux 9.6", "product_id": "Rocky Linux-9.6:bind-dnssec-utils-32:9.16.23-31.el9_6.2.tuxcare.els1.x86_64" }, "product_reference": "bind-dnssec-utils-32:9.16.23-31.el9_6.2.tuxcare.els1.x86_64", "relates_to_product_reference": "Rocky Linux-9.6" } ] }, "vulnerabilities": [ { "cve": "CVE-2023-33953", "cwe": { "id": "CWE-789", "name": "Memory Allocation with Excessive Size Value" }, "notes": [ { "category": "description", "text": "gRPC contains a vulnerability that allows hpack table accounting errors could lead to unwanted disconnects between clients and servers in exceptional cases/ Three vectors were found that allow the following DOS attacks:\n\n- Unbounded memory buffering in the HPACK parser\n- Unbounded CPU consumption in the HPACK parser\n\nThe unbounded CPU consumption is down to a copy that occurred per-input-block in the parser, and because that could be unbounded due to the memory copy bug we end up with an O(n^2) parsing loop, with n selected by the client.\n\nThe unbounded memory buffering bugs:\n\n- The header size limit check was behind the string reading code, so we needed to first buffer up to a 4 gigabyte string before rejecting it as longer than 8 or 16kb.\n- HPACK varints have an encoding quirk whereby an infinite number of 0’s can be added at the start of an integer. gRPC’s hpack parser needed to read all of them before concluding a parse.\n- gRPC’s metadata overflow check was performed per frame, so that the following sequence of frames could cause infinite buffering: HEADERS: containing a: 1 CONTINUATION: containing a: 2 CONTINUATION: containing a: 3 etc…", "title": "Vulnerability description" }, { "category": "general", "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.", "title": "CVSS score applicability" }, { "category": "other", "text": "TuxCare has assessed that this vulnerability does not impact any currently supported TuxCare products. This evaluation may change as new information becomes available. For additional details regarding this vulnerability and affected products, refer to the provided references.", "title": "Statement" } ], "product_status": { "known_not_affected": [ "AlmaLinux-9.6:bind-32:9.16.23-31.el9_6.2.tuxcare.els1.x86_64", "AlmaLinux-9.6:bind-chroot-32:9.16.23-31.el9_6.2.tuxcare.els1.x86_64", "AlmaLinux-9.6:bind-devel-32:9.16.23-31.el9_6.2.tuxcare.els1.i686", "AlmaLinux-9.6:bind-devel-32:9.16.23-31.el9_6.2.tuxcare.els1.x86_64", "AlmaLinux-9.6:bind-dnssec-doc-32:9.16.23-31.el9_6.2.tuxcare.els1.noarch", "AlmaLinux-9.6:bind-dnssec-utils-32:9.16.23-31.el9_6.2.tuxcare.els1.x86_64", "AlmaLinux-9.6:bind-doc-32:9.16.23-31.el9_6.2.tuxcare.els1.noarch", "AlmaLinux-9.6:bind-libs-32:9.16.23-31.el9_6.2.tuxcare.els1.i686", "AlmaLinux-9.6:bind-libs-32:9.16.23-31.el9_6.2.tuxcare.els1.x86_64", "AlmaLinux-9.6:bind-license-32:9.16.23-31.el9_6.2.tuxcare.els1.noarch", "AlmaLinux-9.6:bind-utils-32:9.16.23-31.el9_6.2.tuxcare.els1.x86_64", 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Linux-9.6:tar-2:1.34-7.el9.tuxcare.els1.x86_64" ] }, "references": [ { "category": "self", "summary": "Canonical URL", "url": "https://cve.tuxcare.com/els/cve/CVE-2023-33953" }, { "category": "external", "summary": "https://cloud.google.com/support/bulletins#gcp-2023-022", "url": "https://cloud.google.com/support/bulletins#gcp-2023-022" } ], "release_date": "2023-08-09T13:15:00Z", "scores": [ { "cvss_v3": { "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" }, "products": [ "AlmaLinux-9.6:bind-32:9.16.23-31.el9_6.2.tuxcare.els1.x86_64", "AlmaLinux-9.6:bind-chroot-32:9.16.23-31.el9_6.2.tuxcare.els1.x86_64", "AlmaLinux-9.6:bind-devel-32:9.16.23-31.el9_6.2.tuxcare.els1.i686", 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