CVE-2019-19126

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"value": "En la arquitectura de x86-64, la Biblioteca GNU C (tambi\u00e9n se conoce como glibc) versiones anteriores a 2.31 no omite la variable de entorno de LD_PREFER_MAP_32BIT_EXEC durante la ejecuci\u00f3n del programa despu\u00e9s de una transici\u00f3n de seguridad, permitiendo a atacantes locales restringir las posibles direcciones de mapeo para las bibliotecas cargadas y as\u00ed omitir ASLR para un programa setuid"}], "id": "CVE-2019-19126", "lastModified": "2026-10-14T07:16:50.737", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "LOW", "cvssData": {"accessComplexity": "LOW", "accessVector": "LOCAL", "authentication": "NONE", "availabilityImpact": "NONE", "baseScore": 2.1, "confidentialityImpact": "PARTIAL", "integrityImpact": "NONE", "vectorString": "AV:L/AC:L/Au:N/C:P/I:N/A:N", "version": "2.0"}, "exploitabilityScore": 3.9, "impactScore": 2.9, "obtainAllPrivilege": false, "obtainOtherPrivilege": false, "obtainUserPrivilege": false, "source": 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{"affected_release": [{"advisory": "RHSA-2020:3861", "cpe": "cpe:/o:redhat:enterprise_linux:7", "package": "glibc-0:2.17-317.el7", "product_name": "Red Hat Enterprise Linux 7", "release_date": "2020-09-29T00:00:00Z"}, {"advisory": "RHSA-2020:1828", "cpe": "cpe:/a:redhat:enterprise_linux:8", "package": "glibc-0:2.28-101.el8", "product_name": "Red Hat Enterprise Linux 8", "release_date": "2020-04-28T00:00:00Z"}, {"advisory": "RHSA-2020:1828", "cpe": "cpe:/o:redhat:enterprise_linux:8", "package": "glibc-0:2.28-101.el8", "product_name": "Red Hat Enterprise Linux 8", "release_date": "2020-04-28T00:00:00Z"}, {"advisory": "RHSA-2021:0949", "cpe": "cpe:/a:redhat:openshift_do:1.0::el7", "package": "openshiftdo/odo-init-image-rhel7:1.1.3-2", "product_name": "Red Hat OpenShift Do", "release_date": "2021-03-22T00:00:00Z"}], "bugzilla": {"description": "glibc: LD_PREFER_MAP_32BIT_EXEC not ignored in setuid binaries", "id": "1774681", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1774681"}, "csaw": false, "cvss3": {"cvss3_base_score": "2.9", "cvss3_scoring_vector": "CVSS:3.0/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N", "status": "verified"}, "cwe": "CWE-20", "details": ["On the x86-64 architecture, the GNU C Library (aka glibc) before 2.31 fails to ignore the LD_PREFER_MAP_32BIT_EXEC environment variable during program execution after a security transition, allowing local attackers to restrict the possible mapping addresses for loaded libraries and thus bypass ASLR for a setuid program.", "A vulnerability was discovered in glibc where the LD_PREFER_MAP_32BIT_EXEC environment variable is not ignored when running binaries with the setuid flag on x86_64 architectures. This allows an attacker to force system to utilize only half of the memory (making the system think the software is 32-bit only), thus lowering the amount of memory being used with address space layout randomization (ASLR). The highest threat is confidentiality although the complexity of attack is high. The affected application must already have other vulnerabilities for this flaw to be usable."], "name": "CVE-2019-19126", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:5", "fix_state": "Out of support scope", "package_name": "glibc", "product_name": "Red Hat Enterprise Linux 5"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "glibc", "product_name": "Red Hat Enterprise Linux 6"}], "public_date": "2019-11-19T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2019-19126\nhttps://nvd.nist.gov/vuln/detail/CVE-2019-19126"], "threat_severity": "Low"}

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