CVE-2011-3363: Input Validation
First published: Wed Sep 14 2011(Updated: )
Currently, we skip doing the is_path_accessible check in cifs_mount if there is no prefixpath. There is a report of at least one server however that allows a TREE_CONNECT to a share that has a DFS referral at its root. UNC that had no prefixpath was used in that case, so the is_path_accessible check was not triggered and the box later hit a BUG() because we were chasing a DFS referral on the root dentry for the mount. Upstream fix: 70945643722ffeac779d2529a348f99567fa5c33 References: <a class="bz_bug_link bz_status_CLOSED bz_closed bz_public " title="CLOSED UPSTREAM - mounting of DFS share causes kernel oops" href="show_bug.cgi?id=682829">https://bugzilla.redhat.com/show_bug.cgi?id=682829</a> <a href="https://github.com/torvalds/linux/commit/70945643722ffeac779d2529a348f99567fa5c33">https://github.com/torvalds/linux/commit/70945643722ffeac779d2529a348f99567fa5c33</a> Acknowledgements: Red Hat would like to thank Yogesh Sharma for reporting this issue.
Credit: secalert@redhat.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| debian/linux-2.6 | ||
| Linux kernel | <2.6.39 | |
| Red Hat Enterprise Linux | =4.0 | |
| <2.6.39 | ||
| =4.0 |
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Reference Links
- http://www.openwall.com/lists/oss-security/2011/09/14/12
- https://github.com/torvalds/linux/commit/70945643722ffeac779d2529a348f99567fa5c33
- https://bugzilla.redhat.com/show_bug.cgi?id=738291
- http://ftp.osuosl.org/pub/linux/kernel/v2.6/ChangeLog-2.6.39
- http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=70945643722ffeac779d2529a348f99567fa5c33
- https://launchpad.net/bugs/cve/CVE-2011-3363
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=682829
- https://access.redhat.com/support/policy/updates/errata/
- https://rhn.redhat.com/errata/RHSA-2011-1479.html
- https://rhn.redhat.com/errata/RHSA-2011-1465.html
- https://rhn.redhat.com/errata/RHSA-2012-0010.html
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=748687
- https://security-tracker.debian.org/tracker/CVE-2011-3363
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2011-3363
- https://nvd.nist.gov/vuln/detail/CVE-2011-3363
- https://ubuntu.com/security/CVE-2011-3363
Frequently Asked Questions
What is the severity of CVE-2011-3363?
CVE-2011-3363 has a medium severity level due to potential unauthorized access through the DFS referral.
How do I fix CVE-2011-3363?
To fix CVE-2011-3363, update to an unaffected version of the Linux kernel or apply the relevant patches addressing this vulnerability.
What systems are affected by CVE-2011-3363?
CVE-2011-3363 affects Linux kernel versions up to 2.6.39 and Red Hat Enterprise Linux 4.0.
What does CVE-2011-3363 exploit?
CVE-2011-3363 exploits a flaw in the CIFS implementation in the Linux kernel that skips access checks under certain conditions.
Is there public knowledge about CVE-2011-3363?
Yes, CVE-2011-3363 has been publicly disclosed and discussed in security forums and documentation.
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