Description
In the Linux kernel, the following vulnerability has been resolved: ntfs3: reject direct userspace writes to reserved $LX* xattrs NTFS3 uses $LXUID, $LXGID, $LXMOD and $LXDEV as internal WSL permission metadata and reloads them into i_uid, i_gid and i_mode from ntfs_get_wsl_perm(). Because the empty-prefix xattr handler also lets file owners call setxattr() on these names directly, an unprivileged writer on a writable ntfs3 mount can plant root ownership and S_ISUID on their own file and gain euid 0 after inode reload. Reject direct userspace writes to the reserved $LX* names. Internal ntfs3 metadata updates are unchanged because ntfs_save_wsl_perm() writes them via ntfs_set_ea() directly. [almaz.alexandrovich@paragon-software.com: added an additional check for non privileged users]
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
be71b5cba2e6485e8959da7a9f9a44461a1bb074 to < e574af95234afc3c725988bbc1fdeb46b9f386a4affectedbe71b5cba2e6485e8959da7a9f9a44461a1bb074 to < 2c3cd6da4a14380ef79e34bd9dff7caf46687477affectedbe71b5cba2e6485e8959da7a9f9a44461a1bb074 to < e8852ae29868e449fdb47eebc28f35fb80741a5faffectedbe71b5cba2e6485e8959da7a9f9a44461a1bb074 to < f8d420949b335a4b51d06ab276beee6b8dfdc909affectedbe71b5cba2e6485e8959da7a9f9a44461a1bb074 to < 5e658b9245a52d838ef93729a7bc07de8e19deb7affectedbe71b5cba2e6485e8959da7a9f9a44461a1bb074 to < 293a84fa40b3a1b3471c0545722724bc10973f76affectedbe71b5cba2e6485e8959da7a9f9a44461a1bb074 to < 5b08dccecf825cbf905f348bc6ccb497507e28e2affected
Linux Linux
Default version status: affected
5.15affected0 to < 5.15unaffected5.15.211 to ≤ 5.15.*unaffected6.1.177 to ≤ 6.1.*unaffected6.6.144 to ≤ 6.6.*unaffected6.12.95 to ≤ 6.12.*unaffected6.18.38 to ≤ 6.18.*unaffected7.1.3 to ≤ 7.1.*unaffected7.2 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/e574af95234afc3c725988bbc1fdeb46b9f386a4 ↗
- https://git.kernel.org/stable/c/2c3cd6da4a14380ef79e34bd9dff7caf46687477 ↗
- https://git.kernel.org/stable/c/e8852ae29868e449fdb47eebc28f35fb80741a5f ↗
- https://git.kernel.org/stable/c/f8d420949b335a4b51d06ab276beee6b8dfdc909 ↗
- https://git.kernel.org/stable/c/5e658b9245a52d838ef93729a7bc07de8e19deb7 ↗
- https://git.kernel.org/stable/c/293a84fa40b3a1b3471c0545722724bc10973f76 ↗
- https://git.kernel.org/stable/c/5b08dccecf825cbf905f348bc6ccb497507e28e2 ↗