CVE-2021-3695

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An attacker may take advantage of that to cause heap data corruption or eventually arbitrary code execution and circumvent secure boot protections. This issue has a high complexity to be exploited as an attacker needs to perform some triage over the heap layout to achieve signifcant results, also the values written into the memory are repeated three times in a row making difficult to produce valid payloads. This flaw affects grub2 versions prior grub-2.12."}, {"lang": "es", "value": "Una imagen PNG en escala de grises de 16 bits dise\u00f1ada puede conllevar a una escritura fuera de l\u00edmites en el \u00e1rea de la pila. Un atacante puede aprovecharse de ello para causar corrupci\u00f3n de datos de la pila o, eventualmente, la ejecuci\u00f3n de c\u00f3digo arbitrario y omitir las protecciones de arranque seguro. Este problema presenta una alta complejidad para ser explotado, ya que un atacante necesita llevar a cabo alg\u00fan tipo de triage sobre la disposici\u00f3n de la pila para conseguir resultados significativos, adem\u00e1s los valores escritos en la memoria son repetidos tres veces seguidas dificultando la producci\u00f3n de cargas \u00fatiles v\u00e1lidas. Este fallo afecta a grub2 versiones anteriores a grub-2.12"}], "lastModified": "2024-11-21T06:22:10.483", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:gnu:grub2:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "B798FFCB-4972-436F-ADB4-8DA325089773", "versionEndExcluding": "2.12", "versionStartIncluding": "2.00"}], "operator": "OR"}]}, {"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:fedoraproject:fedora:36:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "5C675112-476C-4D7C-BCB9-A2FB2D0BC9FD"}], "operator": "OR"}]}, {"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:redhat:developer_tools:1.0:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "60937D60-6B78-400F-8D30-7FCF328659A1"}, {"criteria": "cpe:2.3:a:redhat:openshift:3.0:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "62C4B3B6-7452-49AF-8981-737FE929FF97"}, {"criteria": "cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:*", 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