{"dataType": "CVE_RECORD", "dataVersion": "5.1", "cveMetadata": {"state": "PUBLISHED", "cveId": "CVE-2022-42324", "assignerOrgId": "23aa2041-22e1-471f-9209-9b7396fa234f", "assignerShortName": "XEN", "dateUpdated": "2024-08-03T13:03:45.972Z", "dateReserved": "2022-10-03T00:00:00", "datePublished": "2022-11-01T00:00:00"}, "containers": {"cna": {"providerMetadata": {"orgId": "23aa2041-22e1-471f-9209-9b7396fa234f", "shortName": "XEN", "dateUpdated": "2024-02-04T08:07:22.705948"}, "descriptions": [{"lang": "en", "value": "Oxenstored 32->31 bit integer truncation issues Integers in Ocaml are 63 or 31 bits of signed precision. The Ocaml Xenbus library takes a C uint32_t out of the ring and casts it directly to an Ocaml integer. In 64-bit Ocaml builds this is fine, but in 32-bit builds, it truncates off the most significant bit, and then creates unsigned/signed confusion in the remainder. This in turn can feed a negative value into logic not expecting a negative value, resulting in unexpected exceptions being thrown. The unexpected exception is not handled suitably, creating a busy-loop trying (and failing) to take the bad packet out of the xenstore ring."}], "affected": [{"vendor": "Xen", "product": "xen", "versions": [{"version": "consult Xen advisory XSA-420", "status": "unknown"}]}], "references": [{"url": "https://xenbits.xenproject.org/xsa/advisory-420.txt"}, {"url": "http://xenbits.xen.org/xsa/advisory-420.html"}, {"name": "[oss-security] 20221101 Xen Security Advisory 420 v2 (CVE-2022-42324) - Oxenstored 32->31 bit integer truncation issues", "tags": ["mailing-list"], "url": "http://www.openwall.com/lists/oss-security/2022/11/01/10"}, {"name": "DSA-5272", "tags": ["vendor-advisory"], "url": "https://www.debian.org/security/2022/dsa-5272"}, {"name": "FEDORA-2022-07438e12df", "tags": ["vendor-advisory"], "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZLI2NPNEH7CNJO3VZGQNOI4M4EWLNKPZ/"}, {"name": "FEDORA-2022-99af00f60e", "tags": ["vendor-advisory"], "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/YZVXG7OOOXCX6VIPEMLFDPIPUTFAYWPE/"}, {"name": "FEDORA-2022-9f51d13fa3", "tags": ["vendor-advisory"], "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/YTMITQBGC23MSDHUCAPCVGLMVXIBXQTQ/"}, {"name": "GLSA-202402-07", "tags": ["vendor-advisory"], "url": "https://security.gentoo.org/glsa/202402-07"}], "credits": [{"lang": "en", "value": "{'credit_data': {'description': {'description_data': [{'lang': 'eng', 'value': 'This issue was discovered by J\u00fcrgen Gro\u00df of SUSE.'}]}}}"}], "metrics": [{"other": {"type": "unknown", "content": {"description": {"description_data": [{"lang": "eng", "value": "A malicious or buggy guest can write a packet into the xenstore ring\nwhich causes 32-bit builds of oxenstored to busy loop."}]}}}}], "problemTypes": [{"descriptions": [{"type": "text", "lang": "en", "description": "unknown"}]}]}, "adp": [{"providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-03T13:03:45.972Z"}, "title": "CVE Program Container", "references": [{"url": "https://xenbits.xenproject.org/xsa/advisory-420.txt", "tags": ["x_transferred"]}, {"url": "http://xenbits.xen.org/xsa/advisory-420.html", "tags": ["x_transferred"]}, {"name": "[oss-security] 20221101 Xen Security Advisory 420 v2 (CVE-2022-42324) - Oxenstored 32->31 bit integer truncation issues", "tags": ["mailing-list", "x_transferred"], "url": "http://www.openwall.com/lists/oss-security/2022/11/01/10"}, {"name": "DSA-5272", "tags": ["vendor-advisory", "x_transferred"], "url": "https://www.debian.org/security/2022/dsa-5272"}, {"name": "FEDORA-2022-07438e12df", "tags": ["vendor-advisory", "x_transferred"], "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZLI2NPNEH7CNJO3VZGQNOI4M4EWLNKPZ/"}, {"name": "FEDORA-2022-99af00f60e", "tags": ["vendor-advisory", "x_transferred"], "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/YZVXG7OOOXCX6VIPEMLFDPIPUTFAYWPE/"}, {"name": "FEDORA-2022-9f51d13fa3", "tags": ["vendor-advisory", "x_transferred"], "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/YTMITQBGC23MSDHUCAPCVGLMVXIBXQTQ/"}, {"name": "GLSA-202402-07", "tags": ["vendor-advisory", "x_transferred"], "url": "https://security.gentoo.org/glsa/202402-07"}]}]}}

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En compilaciones de Ocaml de 64 bits, esto est\u00e1 bien, pero en compilaciones de 32 bits, trunca el bit m\u00e1s significativo y luego crea confusi\u00f3n sin confirmaci\u00f3n/confirmada en el resto. Esto, a su vez, puede introducir un valor negativo en la l\u00f3gica que no espera un valor negativo, lo que genera excepciones inesperadas. 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