CVE-2023-52443 (GCVE-0-2023-52443)

Vulnerability from cvelistv5 – Published: 2024-02-22 16:13 – Updated: 2025-05-04 07:36
VLAI?
Title
apparmor: avoid crash when parsed profile name is empty
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).
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 04dc715e24d0820bf8740e1a1135ed61fe162bc8 , < 9286ee97aa4803d99185768735011d0d65827c9e (git)
Affected: 04dc715e24d0820bf8740e1a1135ed61fe162bc8 , < 1d8e62b5569cc1466ceb8a7e4872cf10160a9dcf (git)
Affected: 04dc715e24d0820bf8740e1a1135ed61fe162bc8 , < 5ff00408e5029d3550ee77f62dc15f1e15c47f87 (git)
Affected: 04dc715e24d0820bf8740e1a1135ed61fe162bc8 , < 0a12db736edbb4933e4274932aeea594b5876fa4 (git)
Affected: 04dc715e24d0820bf8740e1a1135ed61fe162bc8 , < 9d4fa5fe2b1d56662afd14915a73b4d0783ffa45 (git)
Affected: 04dc715e24d0820bf8740e1a1135ed61fe162bc8 , < 5c0392fdafb0a2321311900be83ffa572bef8203 (git)
Affected: 04dc715e24d0820bf8740e1a1135ed61fe162bc8 , < 77ab09b92f16c8439a948d1af489196953dc4a0e (git)
Affected: 04dc715e24d0820bf8740e1a1135ed61fe162bc8 , < 55a8210c9e7d21ff2644809699765796d4bfb200 (git)
Create a notification for this product.
    Linux Linux Affected: 4.11
Unaffected: 0 , < 4.11 (semver)
Unaffected: 4.19.306 , ≤ 4.19.* (semver)
Unaffected: 5.4.268 , ≤ 5.4.* (semver)
Unaffected: 5.10.209 , ≤ 5.10.* (semver)
Unaffected: 5.15.148 , ≤ 5.15.* (semver)
Unaffected: 6.1.75 , ≤ 6.1.* (semver)
Unaffected: 6.6.14 , ≤ 6.6.* (semver)
Unaffected: 6.7.2 , ≤ 6.7.* (semver)
Unaffected: 6.8 , ≤ * (original_commit_for_fix)
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\"04dc715e24d0820bf8740e1a1135ed61fe162bc8\", \"lessThan\": \"9d4fa5fe2b1d56662afd14915a73b4d0783ffa45\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"04dc715e24d0820bf8740e1a1135ed61fe162bc8\", \"lessThan\": \"5c0392fdafb0a2321311900be83ffa572bef8203\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"04dc715e24d0820bf8740e1a1135ed61fe162bc8\", \"lessThan\": \"77ab09b92f16c8439a948d1af489196953dc4a0e\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"04dc715e24d0820bf8740e1a1135ed61fe162bc8\", \"lessThan\": \"55a8210c9e7d21ff2644809699765796d4bfb200\", \"versionType\": \"git\"}], \"programFiles\": [\"security/apparmor/policy_unpack.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"4.11\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"4.11\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"4.19.306\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.19.*\"}, {\"status\": \"unaffected\", \"version\": \"5.4.268\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.4.*\"}, {\"status\": \"unaffected\", \"version\": \"5.10.209\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.148\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.75\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.14\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.7.2\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.7.*\"}, {\"status\": \"unaffected\", \"version\": \"6.8\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"security/apparmor/policy_unpack.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/9286ee97aa4803d99185768735011d0d65827c9e\"}, {\"url\": \"https://git.kernel.org/stable/c/1d8e62b5569cc1466ceb8a7e4872cf10160a9dcf\"}, {\"url\": \"https://git.kernel.org/stable/c/5ff00408e5029d3550ee77f62dc15f1e15c47f87\"}, {\"url\": \"https://git.kernel.org/stable/c/0a12db736edbb4933e4274932aeea594b5876fa4\"}, {\"url\": \"https://git.kernel.org/stable/c/9d4fa5fe2b1d56662afd14915a73b4d0783ffa45\"}, {\"url\": \"https://git.kernel.org/stable/c/5c0392fdafb0a2321311900be83ffa572bef8203\"}, {\"url\": \"https://git.kernel.org/stable/c/77ab09b92f16c8439a948d1af489196953dc4a0e\"}, {\"url\": \"https://git.kernel.org/stable/c/55a8210c9e7d21ff2644809699765796d4bfb200\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"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).\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.19.306\", \"versionStartIncluding\": \"4.11\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.268\", \"versionStartIncluding\": \"4.11\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.209\", \"versionStartIncluding\": \"4.11\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.148\", \"versionStartIncluding\": \"4.11\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.75\", \"versionStartIncluding\": \"4.11\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.14\", \"versionStartIncluding\": \"4.11\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.7.2\", \"versionStartIncluding\": \"4.11\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.8\", \"versionStartIncluding\": \"4.11\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2025-05-04T07:36:39.239Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2023-52443\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-05-04T07:36:39.239Z\", \"dateReserved\": \"2024-02-20T12:30:33.291Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-02-22T16:13:31.154Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.