Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: fsnotify: do not generate ACCESS/MODIFY events on child for special files inotify/fanotify do not allow users with no read access to a file to subscribe to events (e.g. IN_ACCESS/IN_MODIFY), but they do allow the same user to subscribe for watching events on children when the user has access to the parent directory (e.g. /dev). Users with no read access to a file but with read access to its parent directory can still stat the file and see if it was accessed/modified via atime/mtime change. The same is not true for special files (e.g. /dev/null). Users will not generally observe atime/mtime changes when other users read/write to special files, only when someone sets atime/mtime via utimensat(). Align fsnotify events with this stat behavior and do not generate ACCESS/MODIFY events to parent watchers on read/write of special files. The events are still generated to parent watchers on utimensat(). This closes some side-channels that could be possibly used for information exfiltration [1]. [1] https://snee.la/pdf/pubs/file-notification-attacks.pdf
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 72acc854427948efed7a83da27f7dc3239ac9afc before df2711544b050aba703e6da418c53c7dc5d443ca; affected 72acc854427948efed7a83da27f7dc3239ac9afc before 859bdf438f01d9aa7f84b09c1202d548c7cad9e8; affected 72acc854427948efed7a83da27f7dc3239ac9afc before 6a7d7d96eeeab7af2bd01afbb3d9878a11a13d91; affected 72acc854427948efed7a83da27f7dc3239ac9afc before e0643d46759db8b84c0504a676043e5e341b6c81; affected 72acc854427948efed7a83da27f7dc3239ac9afc before 82f7416bcbd951549e758d15fc1a96a5afc2e900; affected 72acc854427948efed7a83da27f7dc3239ac9afc before 7a93edb23bcf07a3aaf8b598edfc2faa8fbcc0b6; affected 72acc854427948efed7a83da27f7dc3239ac9afc before 635bc4def026a24e071436f4f356ea08c0eed6ff |
| Linux / Linux | affected 2.6.36; unaffected 0 before 2.6.36; unaffected 5.10.248 through 5.10.*; unaffected 5.15.198 through 5.15.*; unaffected 6.1.160 through 6.1.*; unaffected 6.6.120 through 6.6.*; unaffected 6.12.64 through 6.12.*; unaffected 6.18.3 through 6.18.*; unaffected 6.19 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/df2711544b050aba703e6da418c53c7dc5d443ca
- https://git.kernel.org/stable/c/859bdf438f01d9aa7f84b09c1202d548c7cad9e8
- https://git.kernel.org/stable/c/6a7d7d96eeeab7af2bd01afbb3d9878a11a13d91
- https://git.kernel.org/stable/c/e0643d46759db8b84c0504a676043e5e341b6c81
- https://git.kernel.org/stable/c/82f7416bcbd951549e758d15fc1a96a5afc2e900
- https://git.kernel.org/stable/c/7a93edb23bcf07a3aaf8b598edfc2faa8fbcc0b6
- https://git.kernel.org/stable/c/635bc4def026a24e071436f4f356ea08c0eed6ff
ADP enrichment
No English description supplied.
No references supplied.
No English description supplied.