Messages in this thread |  | | From | David Holland <> | Subject | smbmount (and ncpmount?) | Date | Tue, 20 Aug 1996 19:19:58 -0400 (EDT) |
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smbmount has half a dozen possible buffer overruns. It also execs modprobe setuid root; I believe this is likely to be a significant hazard. Patches have been sent to the maintainer.
There's a more serious problem that more or less has to affect ncpmount and any other similar program: there's a race condition between when the mount point is checked for permission and when the mount is performed. Thus anyone can mount shares anywhere by playing symlink games, and of course become root about ten seconds later.
This problem cannot be fixed without updating the kernel - either the permission check needs to be moved into the kernel, or the mount point needs to be passed to the kernel as a fd instead of a pathname.
Myself, I prefer moving the permission check into the kernel; Ultrix supported user NFS mounts that way long, long ago.
Recommendation: chmod -s smbmount and smbumount, and probably ncpmount too.
-- - David A. Holland | Number of words in the English language that dholland@hcs.harvard.edu | exist because of typos or misreadings: 381
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