CVE Database


Impact: Low
Public: 2011-03-03
Bugzilla: 695925: CVE-2011-1678 samba/cifs-utils: mount.cifs and umount.cifs fail to anticipate RLIMIT_FSIZE
IAVA: 2012-A-0020


The MITRE CVE dictionary describes this issue as:

smbfs in Samba 3.5.8 and earlier attempts to use (1) mount.cifs to append to the /etc/mtab file and (2) umount.cifs to append to the /etc/mtab.tmp file without first checking whether resource limits would interfere, which allows local users to trigger corruption of the /etc/mtab file via a process with a small RLIMIT_FSIZE value, a related issue to CVE-2011-1089.

Find out more about CVE-2011-1678 from the MITRE CVE dictionary and NIST NVD.


On Red Hat Enterprise Linux, by default, mount.cifs is not provided with the setuid bit enabled. If a user has turned on the setuid bit (via chmod +s /sbin/mount.cifs), they would be affected by this issue, and can work around the problem by removing the setuid bit.
Red Hat Enterprise Linux 3 does not provide the mount.cifs program.

CVSS v2 metrics

Base Score: 3.3
Base Metrics: AV:L/AC:M/Au:N/C:N/I:P/A:P
Access Vector: Local
Access Complexity: Medium
Authentication: None
Confidentiality Impact: None
Integrity Impact: Partial
Availability Impact: Partial

Find out more about Red Hat support for the Common Vulnerability Scoring System (CVSS).

Red Hat security errata

Platform Errata Release Date
Red Hat Enterprise Linux version 4 (samba) RHSA-2011:1219 August 29, 2011
Red Hat Enterprise Linux version 5 (samba) RHSA-2011:1219 August 29, 2011
Red Hat Enterprise Linux version 5 (samba3x) RHSA-2011:1220 August 29, 2011
Red Hat Enterprise Linux version 6 RHSA-2011:1221 August 29, 2011

External References


Red Hat would like to thank Dan Rosenberg for reporting this issue.

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For clarification or corrections please contact the Red Hat Security Response Team.