415 lines
22 KiB
JSON
415 lines
22 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2024-43882",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2024-08-17T09:11:59.287Z",
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"datePublished": "2024-08-21T00:10:49.556Z",
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"dateUpdated": "2026-10-15T00:48:49.093Z"
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},
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},
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"descriptions": [
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{
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"lang": "en",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nexec: Fix ToCToU between perm check and set-uid/gid usage\n\nWhen opening a file for exec via do_filp_open(), permission checking is\ndone against the file's metadata at that moment, and on success, a file\npointer is passed back. Much later in the execve() code path, the file\nmetadata (specifically mode, uid, and gid) is used to determine if/how\nto set the uid and gid. However, those values may have changed since the\npermissions check, meaning the execution may gain unintended privileges.\n\nFor example, if a file could change permissions from executable and not\nset-id:\n\n---------x 1 root root 16048 Aug 7 13:16 target\n\nto set-id and non-executable:\n\n---S------ 1 root root 16048 Aug 7 13:16 target\n\nit is possible to gain root privileges when execution should have been\ndisallowed.\n\nWhile this race condition is rare in real-world scenarios, it has been\nobserved (and proven exploitable) when package managers are updating\nthe setuid bits of installed programs. Such files start with being\nworld-executable but then are adjusted to be group-exec with a set-uid\nbit. For example, \"chmod o-x,u+s target\" makes \"target\" executable only\nby uid \"root\" and gid \"cdrom\", while also becoming setuid-root:\n\n-rwxr-xr-x 1 root cdrom 16048 Aug 7 13:16 target\n\nbecomes:\n\n-rwsr-xr-- 1 root cdrom 16048 Aug 7 13:16 target\n\nBut racing the chmod means users without group \"cdrom\" membership can\nget the permission to execute \"target\" just before the chmod, and when\nthe chmod finishes, the exec reaches brpm_fill_uid(), and performs the\nsetuid to root, violating the expressed authorization of \"only cdrom\ngroup members can setuid to root\".\n\nRe-check that we still have execute permissions in case the metadata\nhas changed. It would be better to keep a copy from the perm-check time,\nbut until we can do that refactoring, the least-bad option is to do a\nfull inode_permission() call (under inode lock). It is understood that\nthis is safe against dead-locks, but hardly optimal."
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 7.8,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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"value": "AV:L - The vulnerability is reached through the execve()/execveat() syscall path (do_execveat_common → bprm_execve → bprm_fill_uid), requiring local access to the system. No network protocol or remote data processing is involved.\nAC:L - The attacker fully controls their side of the race and can stall a permission-checked exec indefinitely, because copy_strings() for argv/envp runs after do_open_execat()'s MAY_EXEC check and faults on attacker-owned pages (userfaultfd/FUSE-backed), so the exec can be parked until the setuid-adding chmod is observed via inotify; the exec loop can also simply be run continuously at no cost, and on typical desktop configurations the unprivileged attacker can trigger the package-manager operation themselves via PackageKit/polkit.\nPR:L - Requires only an unprivileged local account able to execute the target file at the moment of open (e.g. while it is still world-executable). No capabilities, no group membership, and no user-namespace tricks are needed.\nUI:N - No human victim action is needed — the triggering chmod is performed by automated package-manager activity (unattended-upgrades/dnf-automatic/dpkg unpack) or can be induced by the attacker via PackageKit, while the attacker's exec loop runs unattended.\nS:U - This is a standard local privilege escalation within the same security authority: an unprivileged user gains root on the same OS instance, with no crossing of a VM, IOMMU, or sandbox boundary.\nC:H - Successful exploitation yields euid 0 in the initial user namespace, granting unrestricted read access to all files, memory, and secrets on the system.\nI:H - Root privileges allow arbitrary modification of any file, kernel configuration, and system state — a complete loss of integrity, which is precisely the \"unintended privileges\" the commit describes as proven exploitable.\nA:H - With root obtained, the attacker can shut down, panic, or otherwise render the system entirely unavailable."
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}
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]
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}
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