Red Hat Bugzilla – Bug 1536053
CVE-2017-2619 regression with non-wide symlinks to directories
Last modified: 2018-06-19 01:09:21 EDT
Description of problem: The new helper function non_widelink_open() introduced with the fix part of the security fix for CVE-2017-2619 cannot reliably handle (non-wide) symlinks to directories if the underlying OS supports to O_DIRECTORY flag to open(). In this case, source3/smbd/open.c::open_directory() may end up calling fd_open() with flags O_RDONLY|O_DIRECTORY. If wide links = no, the flags get passed on to non_widelink_open(), which in turns adds O_NOFOLLOW, calls SMB_VFS_OPEN(), and then checks errno for ELOOP to detect whether a symlink was hit. However, due to the flag O_DIRECTORY, open() may also return ENOTDIR in this case, and non_widelink_open() won't try to follow the link even if it remains within the share.
I have this. If this is ON_QA is it likely to get a release before 6.10 (given this isn't in beta yet from what I can see), and this seems to be what this bug fix is targeting? Further, is this release imminent without me opening a support case?
Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory, and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. https://access.redhat.com/errata/RHSA-2018:1860