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CVE-2011-1678

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

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 dictionary and NIST NVD.

Statement

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

NOTE: The following CVSS v2 metrics and score provided are preliminary and subject to review.

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 5 (samba3x) RHSA-2011:1220 2011-08-29
Red Hat Enterprise Linux 6 (various) RHSA-2011:1221 2011-08-29
Red Hat Enterprise Linux 4 (samba) RHSA-2011:1219 2011-08-29
Red Hat Enterprise Linux 5 (samba) RHSA-2011:1219 2011-08-29

Affected Packages State

Platform Package State
Red Hat Enterprise Linux version 6 cifs-utils 4.8.1-2.el6_1.2 Fixed
Red Hat Enterprise Linux version 6 samba 3.5.6-86.el6_1.4 Fixed

Acknowledgements

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

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