|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.
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
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Red Hat security errata
|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|
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.