mirror of
https://github.com/CVEProject/cvelist.git
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158 lines
9.6 KiB
JSON
158 lines
9.6 KiB
JSON
{
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"data_version": "4.0",
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"data_type": "CVE",
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"data_format": "MITRE",
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"CVE_data_meta": {
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"ID": "CVE-2024-43882",
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"ASSIGNER": "cve@kernel.org",
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"STATE": "PUBLIC"
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},
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"description": {
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"description_data": [
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{
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"lang": "eng",
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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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},
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"problemtype": {
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"problemtype_data": [
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{
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"description": [
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{
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"lang": "eng",
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"value": "n/a"
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}
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]
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}
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]
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},
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"affects": {
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"vendor": {
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"vendor_data": [
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{
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"vendor_name": "Linux",
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"product": {
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"product_data": [
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{
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"product_name": "Linux",
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"version": {
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"version_data": [
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{
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"version_affected": "<",
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"version_name": "1da177e4c3f4",
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"version_value": "d5c3c7e26275"
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},
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{
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"version_value": "not down converted",
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"x_cve_json_5_version_data": {
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"versions": [
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{
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"version": "4.19.320",
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"lessThanOrEqual": "4.19.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "5.4.282",
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"lessThanOrEqual": "5.4.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "5.10.224",
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"lessThanOrEqual": "5.10.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "5.15.165",
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"lessThanOrEqual": "5.15.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.1.106",
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"lessThanOrEqual": "6.1.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.6.47",
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"lessThanOrEqual": "6.6.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.10.6",
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"lessThanOrEqual": "6.10.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.11",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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],
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"defaultStatus": "affected"
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}
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}
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]
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}
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}
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]
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}
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}
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]
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}
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},
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"references": {
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"reference_data": [
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{
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"url": "https://git.kernel.org/stable/c/d5c3c7e26275a2d83b894d30f7582a42853a958f",
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"refsource": "MISC",
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"name": "https://git.kernel.org/stable/c/d5c3c7e26275a2d83b894d30f7582a42853a958f"
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},
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{
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"url": "https://git.kernel.org/stable/c/368f6985d46657b8b466a421dddcacd4051f7ada",
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"refsource": "MISC",
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"name": "https://git.kernel.org/stable/c/368f6985d46657b8b466a421dddcacd4051f7ada"
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},
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{
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"url": "https://git.kernel.org/stable/c/15469d46ba34559bfe7e3de6659115778c624759",
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"refsource": "MISC",
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"name": "https://git.kernel.org/stable/c/15469d46ba34559bfe7e3de6659115778c624759"
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},
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{
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"url": "https://git.kernel.org/stable/c/9b424c5d4130d56312e2a3be17efb0928fec4d64",
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"refsource": "MISC",
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"name": "https://git.kernel.org/stable/c/9b424c5d4130d56312e2a3be17efb0928fec4d64"
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},
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{
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"url": "https://git.kernel.org/stable/c/f6cfc6bcfd5e1cf76115b6450516ea4c99897ae1",
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"refsource": "MISC",
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"name": "https://git.kernel.org/stable/c/f6cfc6bcfd5e1cf76115b6450516ea4c99897ae1"
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},
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{
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"url": "https://git.kernel.org/stable/c/d2a2a4714d80d09b0f8eb6438ab4224690b7121e",
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"refsource": "MISC",
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"name": "https://git.kernel.org/stable/c/d2a2a4714d80d09b0f8eb6438ab4224690b7121e"
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},
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{
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"url": "https://git.kernel.org/stable/c/90dfbba89ad4f0d9c9744ecbb1adac4aa2ff4f3e",
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"refsource": "MISC",
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"name": "https://git.kernel.org/stable/c/90dfbba89ad4f0d9c9744ecbb1adac4aa2ff4f3e"
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},
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{
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"url": "https://git.kernel.org/stable/c/f50733b45d865f91db90919f8311e2127ce5a0cb",
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"refsource": "MISC",
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"name": "https://git.kernel.org/stable/c/f50733b45d865f91db90919f8311e2127ce5a0cb"
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}
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]
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},
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"generator": {
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"engine": "bippy-9e1c9544281a"
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}
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} |