CVE-2023-52443
Vulnerability from cvelistv5
Published
2024-02-22 16:13
Modified
2024-12-19 08:19
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: apparmor: avoid crash when parsed profile name is empty When processing a packed profile in unpack_profile() described like "profile :ns::samba-dcerpcd /usr/lib*/samba/{,samba/}samba-dcerpcd {...}" a string ":samba-dcerpcd" is unpacked as a fully-qualified name and then passed to aa_splitn_fqname(). aa_splitn_fqname() treats ":samba-dcerpcd" as only containing a namespace. Thus it returns NULL for tmpname, meanwhile tmpns is non-NULL. Later aa_alloc_profile() crashes as the new profile name is NULL now. general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN NOPTI KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] CPU: 6 PID: 1657 Comm: apparmor_parser Not tainted 6.7.0-rc2-dirty #16 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.2-3-gd478f380-rebuilt.opensuse.org 04/01/2014 RIP: 0010:strlen+0x1e/0xa0 Call Trace: <TASK> ? strlen+0x1e/0xa0 aa_policy_init+0x1bb/0x230 aa_alloc_profile+0xb1/0x480 unpack_profile+0x3bc/0x4960 aa_unpack+0x309/0x15e0 aa_replace_profiles+0x213/0x33c0 policy_update+0x261/0x370 profile_replace+0x20e/0x2a0 vfs_write+0x2af/0xe00 ksys_write+0x126/0x250 do_syscall_64+0x46/0xf0 entry_SYSCALL_64_after_hwframe+0x6e/0x76 </TASK> ---[ end trace 0000000000000000 ]--- RIP: 0010:strlen+0x1e/0xa0 It seems such behaviour of aa_splitn_fqname() is expected and checked in other places where it is called (e.g. aa_remove_profiles). Well, there is an explicit comment "a ns name without a following profile is allowed" inside. AFAICS, nothing can prevent unpacked "name" to be in form like ":samba-dcerpcd" - it is passed from userspace. Deny the whole profile set replacement in such case and inform user with EPROTO and an explaining message. Found by Linux Verification Center (linuxtesting.org).
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/0a12db736edbb4933e4274932aeea594b5876fa4Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/1d8e62b5569cc1466ceb8a7e4872cf10160a9dcfPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/55a8210c9e7d21ff2644809699765796d4bfb200Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/5c0392fdafb0a2321311900be83ffa572bef8203Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/5ff00408e5029d3550ee77f62dc15f1e15c47f87Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/77ab09b92f16c8439a948d1af489196953dc4a0ePatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/9286ee97aa4803d99185768735011d0d65827c9ePatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/9d4fa5fe2b1d56662afd14915a73b4d0783ffa45Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/0a12db736edbb4933e4274932aeea594b5876fa4Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/1d8e62b5569cc1466ceb8a7e4872cf10160a9dcfPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/55a8210c9e7d21ff2644809699765796d4bfb200Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/5c0392fdafb0a2321311900be83ffa572bef8203Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/5ff00408e5029d3550ee77f62dc15f1e15c47f87Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/77ab09b92f16c8439a948d1af489196953dc4a0ePatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/9286ee97aa4803d99185768735011d0d65827c9ePatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/9d4fa5fe2b1d56662afd14915a73b4d0783ffa45Patch
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2024/06/msg00016.html
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2024/06/msg00020.html
Impacted products
Vendor Product Version
Linux Linux Version: 4.11
Show details on NVD website

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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\napparmor: avoid crash when parsed profile name is empty\n\nWhen processing a packed profile in unpack_profile() described like\n\n \"profile :ns::samba-dcerpcd /usr/lib*/samba/{,samba/}samba-dcerpcd {...}\"\n\na string \":samba-dcerpcd\" is unpacked as a fully-qualified name and then\npassed to aa_splitn_fqname().\n\naa_splitn_fqname() treats \":samba-dcerpcd\" as only containing a namespace.\nThus it returns NULL for tmpname, meanwhile tmpns is non-NULL. Later\naa_alloc_profile() crashes as the new profile name is NULL now.\n\ngeneral protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN NOPTI\nKASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]\nCPU: 6 PID: 1657 Comm: apparmor_parser Not tainted 6.7.0-rc2-dirty #16\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.2-3-gd478f380-rebuilt.opensuse.org 04/01/2014\nRIP: 0010:strlen+0x1e/0xa0\nCall Trace:\n \u003cTASK\u003e\n ? strlen+0x1e/0xa0\n aa_policy_init+0x1bb/0x230\n aa_alloc_profile+0xb1/0x480\n unpack_profile+0x3bc/0x4960\n aa_unpack+0x309/0x15e0\n aa_replace_profiles+0x213/0x33c0\n policy_update+0x261/0x370\n profile_replace+0x20e/0x2a0\n vfs_write+0x2af/0xe00\n ksys_write+0x126/0x250\n do_syscall_64+0x46/0xf0\n entry_SYSCALL_64_after_hwframe+0x6e/0x76\n \u003c/TASK\u003e\n---[ end trace 0000000000000000 ]---\nRIP: 0010:strlen+0x1e/0xa0\n\nIt seems such behaviour of aa_splitn_fqname() is expected and checked in\nother places where it is called (e.g. aa_remove_profiles). Well, there\nis an explicit comment \"a ns name without a following profile is allowed\"\ninside.\n\nAFAICS, nothing can prevent unpacked \"name\" to be in form like\n\":samba-dcerpcd\" - it is passed from userspace.\n\nDeny the whole profile set replacement in such case and inform user with\nEPROTO and an explaining message.\n\nFound by Linux Verification Center (linuxtesting.org)."
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    "nvd": "{\"cve\":{\"id\":\"CVE-2023-52443\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-02-22T17:15:08.377\",\"lastModified\":\"2024-11-21T08:39:46.453\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\napparmor: avoid crash when parsed profile name is empty\\n\\nWhen processing a packed profile in unpack_profile() described like\\n\\n \\\"profile :ns::samba-dcerpcd /usr/lib*/samba/{,samba/}samba-dcerpcd {...}\\\"\\n\\na string \\\":samba-dcerpcd\\\" is unpacked as a fully-qualified name and then\\npassed to aa_splitn_fqname().\\n\\naa_splitn_fqname() treats \\\":samba-dcerpcd\\\" as only containing a namespace.\\nThus it returns NULL for tmpname, meanwhile tmpns is non-NULL. Later\\naa_alloc_profile() crashes as the new profile name is NULL now.\\n\\ngeneral protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN NOPTI\\nKASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]\\nCPU: 6 PID: 1657 Comm: apparmor_parser Not tainted 6.7.0-rc2-dirty #16\\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.2-3-gd478f380-rebuilt.opensuse.org 04/01/2014\\nRIP: 0010:strlen+0x1e/0xa0\\nCall Trace:\\n \u003cTASK\u003e\\n ? strlen+0x1e/0xa0\\n aa_policy_init+0x1bb/0x230\\n aa_alloc_profile+0xb1/0x480\\n unpack_profile+0x3bc/0x4960\\n aa_unpack+0x309/0x15e0\\n aa_replace_profiles+0x213/0x33c0\\n policy_update+0x261/0x370\\n profile_replace+0x20e/0x2a0\\n vfs_write+0x2af/0xe00\\n ksys_write+0x126/0x250\\n do_syscall_64+0x46/0xf0\\n entry_SYSCALL_64_after_hwframe+0x6e/0x76\\n \u003c/TASK\u003e\\n---[ end trace 0000000000000000 ]---\\nRIP: 0010:strlen+0x1e/0xa0\\n\\nIt seems such behaviour of aa_splitn_fqname() is expected and checked in\\nother places where it is called (e.g. aa_remove_profiles). Well, there\\nis an explicit comment \\\"a ns name without a following profile is allowed\\\"\\ninside.\\n\\nAFAICS, nothing can prevent unpacked \\\"name\\\" to be in form like\\n\\\":samba-dcerpcd\\\" - it is passed from userspace.\\n\\nDeny the whole profile set replacement in such case and inform user with\\nEPROTO and an explaining message.\\n\\nFound by Linux Verification Center (linuxtesting.org).\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: apparmor: evita fallas cuando el nombre del perfil analizado est\u00e1 vac\u00edo Al procesar un perfil empaquetado en unpack_profile() descrito como \\\"perfil :ns::samba-dcerpcd /usr/lib*/samba/ {,samba/}samba-dcerpcd {...}\\\" una cadena \\\":samba-dcerpcd\\\" se descomprime como un nombre completo y luego se pasa a aa_splitn_fqname(). aa_splitn_fqname() trata \\\":samba-dcerpcd\\\" como si solo contuviera un espacio de nombres. Por lo tanto, devuelve NULL para tmpname, mientras que tmpns no es NULL. M\u00e1s tarde, aa_alloc_profile() falla porque el nuevo nombre del perfil ahora es NULL. falla de protecci\u00f3n general, probablemente para direcci\u00f3n no can\u00f3nica 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN NOPTI KASAN: null-ptr-deref en rango [0x00000000000000000-0x0000000000000007] CPU: 6 PID: 1657 Comm: apparmor_parser No contaminado 6.7.0- rc2-dirty #16 Nombre del hardware: PC est\u00e1ndar QEMU (i440FX + PIIX, 1996), BIOS rel-1.16.2-3-gd478f380-rebuilt.opensuse.org 01/04/2014 RIP: 0010:strlen+0x1e/0xa0 Llamada Seguimiento:  ? strlen+0x1e/0xa0 aa_policy_init+0x1bb/0x230 aa_alloc_profile+0xb1/0x480 unpack_profile+0x3bc/0x4960 aa_unpack+0x309/0x15e0 aa_replace_profiles+0x213/0x33c0 Policy_update+0x261/0x370 perfil_replace+ 0x20e/0x2a0 vfs_write+0x2af/0xe00 ksys_write+0x126/0x250 do_syscall_64+0x46/0xf0 Entry_SYSCALL_64_after_hwframe+0x6e/0x76  ---[ end trace 0000000000000000 ]--- RIP: 0010:strlen+0x1e/0xa0 Parece que tal comportamiento de aa_splitn_fqname() se espera y se verifica en otros lugares donde se llama (por ejemplo, aa_remove_profiles). Bueno, hay un comentario expl\u00edcito \\\"se permite un nombre ns sin un perfil de seguimiento\\\" dentro. AFAICS, nada puede evitar que el \\\"nombre\\\" descomprimido tenga un formato como \\\":samba-dcerpcd\\\": se pasa desde el espacio de usuario. En tal caso, rechace el reemplazo completo del conjunto de perfiles e informe al usuario con EPROTO y un mensaje explicativo. Encontrado por el Centro de verificaci\u00f3n de Linux (linuxtesting.org).\"}],\"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:N/I:N/A:H\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-476\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionEndExcluding\":\"4.19.306\",\"matchCriteriaId\":\"0A7AEFD0-0681-4E8D-9074-27416D3EE94C\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"4.20\",\"versionEndExcluding\":\"5.4.268\",\"matchCriteriaId\":\"991BF737-6083-429B-ACD5-FB27D4143E2F\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.5.0\",\"versionEndExcluding\":\"5.10.209\",\"matchCriteriaId\":\"5D2E4F24-2FBB-4434-8598-2B1499E566B5\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.11.0\",\"versionEndExcluding\":\"5.15.148\",\"matchCriteriaId\":\"E25E1389-4B0F-407A-9C94-5908FF3EE88B\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.16.0\",\"versionEndExcluding\":\"6.1.75\",\"matchCriteriaId\":\"2C4951FA-80C0-4B4C-9836-6E5035DEB0F9\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.2.0\",\"versionEndExcluding\":\"6.6.14\",\"matchCriteriaId\":\"BDBBEB0E-D13A-4567-8984-51C5375350B9\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.7.0\",\"versionEndExcluding\":\"6.7.2\",\"matchCriteriaId\":\"0EA3778C-730B-464C-8023-18CA6AC0B807\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/0a12db736edbb4933e4274932aeea594b5876fa4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/1d8e62b5569cc1466ceb8a7e4872cf10160a9dcf\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/55a8210c9e7d21ff2644809699765796d4bfb200\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/5c0392fdafb0a2321311900be83ffa572bef8203\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/5ff00408e5029d3550ee77f62dc15f1e15c47f87\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/77ab09b92f16c8439a948d1af489196953dc4a0e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/9286ee97aa4803d99185768735011d0d65827c9e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/9d4fa5fe2b1d56662afd14915a73b4d0783ffa45\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/0a12db736edbb4933e4274932aeea594b5876fa4\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/1d8e62b5569cc1466ceb8a7e4872cf10160a9dcf\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/55a8210c9e7d21ff2644809699765796d4bfb200\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/5c0392fdafb0a2321311900be83ffa572bef8203\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/5ff00408e5029d3550ee77f62dc15f1e15c47f87\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/77ab09b92f16c8439a948d1af489196953dc4a0e\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/9286ee97aa4803d99185768735011d0d65827c9e\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/9d4fa5fe2b1d56662afd14915a73b4d0783ffa45\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://lists.debian.org/debian-lts-announce/2024/06/msg00016.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://lists.debian.org/debian-lts-announ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  }
}


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Sightings

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