Multiple race conditions in the (1) mount.cifs and (2) umount.cifs programs in Samba 3.6 allow local users to cause a denial of service (mounting outage) via a SIGKILL signal during a time window when the /etc/mtab~ file exists.

References

• https://nvd.nist.gov/vuln/detail/CVE-2011-3585
• https://bugzilla.redhat.com/show_bug.cgi?id=742907
• https://bugzilla.samba.org/show_bug.cgi?id=7179
• https://git.samba.org/?p=cifs-utils.git;a=commitdiff;h=810f7e4e0f2dbcbee0294d9b371071cb08268200
• https://www.openwall.com/lists/oss-security/2011/09/27/1
• https://www.openwall.com/lists/oss-security/2011/09/30/5
• https://git.samba.org/?p=cifs-utils.git%3Ba=commitdiff%3Bh=810f7e4e0f2dbcbee0294d9b371071cb08268200