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In an extremely rare situation, the getaddrinfo function may access memory that has been freed, resulting in an application crash. This issue is only exploitable when a NSS module implements only the _nss_*_gethostbyname2_r and _nss_*_getcanonname_r hooks without implementing the _nss_*_gethostbyname3_r hook. The resolved name should return a large number of IPv6 and IPv4, and the call to the getaddrinfo function should have the AF_INET6 address family with AI_CANONNAME, AI_ALL and AI_V4MAPPED as flags."}, {"lang": "es", "value": "Se encontr\u00f3 una falla en glibc. En una situaci\u00f3n extremadamente rara, la funci\u00f3n getaddrinfo puede acceder a la memoria que se ha liberado, lo que provoca un bloqueo de la aplicaci\u00f3n. Este problema solo se puede explotar cuando un m\u00f3dulo NSS implementa solo los hooks _nss_*_gethostbyname2_r y _nss_*_getcanonname_r sin implementar el hook _nss_*_gethostbyname3_r. 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{"acknowledgement": "This issue was discovered by Siddhesh Poyarekar (Red Hat).", "affected_release": [{"advisory": "RHSA-2023:5455", "cpe": "cpe:/a:redhat:enterprise_linux:8", "package": "glibc-0:2.28-225.el8_8.6", "product_name": "Red Hat Enterprise Linux 8", "release_date": "2023-10-05T00:00:00Z"}, {"advisory": "RHSA-2023:5455", "cpe": "cpe:/o:redhat:enterprise_linux:8", "package": "glibc-0:2.28-225.el8_8.6", "product_name": "Red Hat Enterprise Linux 8", "release_date": "2023-10-05T00:00:00Z"}, {"advisory": "RHSA-2023:7409", "cpe": "cpe:/a:redhat:rhel_eus:8.6", "package": "glibc-0:2.28-189.8.el8_6", "product_name": "Red Hat Enterprise Linux 8.6 Extended Update Support", "release_date": "2023-11-21T00:00:00Z"}, {"advisory": "RHSA-2023:5453", "cpe": "cpe:/a:redhat:enterprise_linux:9", "package": "glibc-0:2.34-60.el9_2.7", "product_name": "Red Hat Enterprise Linux 9", "release_date": "2023-10-05T00:00:00Z"}, {"advisory": "RHSA-2023:5453", "cpe": "cpe:/o:redhat:enterprise_linux:9", "package": "glibc-0:2.34-60.el9_2.7", "product_name": "Red Hat Enterprise Linux 9", "release_date": "2023-10-05T00:00:00Z"}, {"advisory": "RHSA-2023:7409", "cpe": "cpe:/o:redhat:rhev_hypervisor:4.4::el8", "package": "glibc-0:2.28-189.8.el8_6", "product_name": "Red Hat Virtualization 4 for Red Hat Enterprise Linux 8", "release_date": "2023-11-21T00:00:00Z"}], "bugzilla": {"description": "glibc: potential use-after-free in getaddrinfo()", "id": "2237782", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2237782"}, "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": "verified"}, "cwe": "CWE-416", "details": ["A flaw was found in glibc. In an extremely rare situation, the getaddrinfo function may access memory that has been freed, resulting in an application crash. This issue is only exploitable when a NSS module implements only the _nss_*_gethostbyname2_r and _nss_*_getcanonname_r hooks without implementing the _nss_*_gethostbyname3_r hook. The resolved name should return a large number of IPv6 and IPv4, and the call to the getaddrinfo function should have the AF_INET6 address family with AI_CANONNAME, AI_ALL and AI_V4MAPPED as flags.", "A flaw was found in glibc. In an extremely rare situation, the getaddrinfo function may access memory that has been freed, resulting in an application crash. This issue is only exploitable when a NSS module implements only the _nss_*_gethostbyname2_r and _nss_*_getcanonname_r hooks without implementing the _nss_*_gethostbyname3_r hook. The resolved name should return a large number of IPv6 and IPv4, and the call to the getaddrinfo function should have the AF_INET6 address family with AI_CANONNAME, AI_ALL and AI_V4MAPPED as flags."], "name": "CVE-2023-4806", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "compat-glibc", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "glibc", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Will not fix", "package_name": "compat-glibc", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Will not fix", "package_name": "glibc", "product_name": "Red Hat Enterprise Linux 7"}], "public_date": "2023-09-12T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2023-4806\nhttps://nvd.nist.gov/vuln/detail/CVE-2023-4806"], "statement": "This issue is only exploitable with very specific conditions, as detailed in the description. However, all glibc versions shipped in Red Hat Enterprise Linux are vulnerable to this issue.", "threat_severity": "Moderate"}