A command injection vulnerability in GPFS / Spectrum Scale allows attackers to escalate privileges to root
|Product||IBM GPFS / Spectrum Scale|
IBM’s General Parallel File System (GPFS), now known as Spectrum Scale, is affected by a vulnerability that allows an adversary on any system which mounts GPFS to inject commands which are later executed as root.
Exploitation of this vulnerability allows any user of a system with a GPFS filesystem mounted to execute commands as root across the GPFS cluster.
This is caused by a failure to safely handle arguments supplied to a number of setuid binaries.
IBM have provided patches in order to resolve this issue. It is recommended that these patches (described in the ‘Solution’ section below) are applied. However, if this is not possible some workarounds may also be applied:
Remove the setuid from the files in the /usr/lpp/mmfs/bin directory. These can be identified by running
ls -l /usr/lpp/mmfs/bin | grep r-s
Reset the setuid bit for each such file by issuing this command on each file
chmod u-s file
Once the workaround is applied, a number of commands may no longer work when not invoked by unprivileged users, including:
(These workarounds are taken from the IBM supplied advisory which can be found at: http://www-01.ibm.com/support/docview.wss?uid=isg3T1023763)
If the workarounds would not affect the usability of GPFS within your environment, then MWR recommend applying these workarounds in addition to the IBM supplied patches detailed below.
IBM have provided fixes for this issue; however, MWR have not tested the effectiveness of these patches:
For older versions of IBM GPFS, if you have an extended service contract, please contact IBM Service.
(These solutions are taken from the IBM supplied advisory which can be found at: http://www-01.ibm.com/support/docview.wss?uid=isg3T1023763)
The IBM advisory relating to this issue can be found at the following location: http://www-01.ibm.com/support/docview.wss?uid=isg3T1023763
This issue is closely related to a format string issue in GPFS (CVE-2015-0197) found by Florian Grunwo and Felix Wilhelm of ERNW: http://www-01.ibm.com/support/docview.wss?uid=isg3T1022062
Further technical information may be released at a later date when users have had a chance to resolve this issue.
Issue reported to vendor
Patch and vendor advisory released
MWR advisory released