Security Bulletin: Power HMC viosrvcmd command allows elevated privilege on VIOS (CVE-2012-2188)
IBM PSIRT 270004PFE3 firstname.lastname@example.org | | Tags:  psirthigh psirtpower
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Power HMC viosrvcmd command allows elevated privilege on VIOS
CVE ID: CVE-2012-2188
Power HMC does not enforce sufficient filtering on viosrvcmd command. In particular, ‘$’ and ‘&’ characters are allowed, which can result in elevated access privilege on VIOS..
CVSS Base Score: 7.2
CVSS Temporal Score: See http://xforce.iss.net/xforce/xfdb/75906 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (AV:L/AC:L/Au:N/C:C/I:C/A:C)
Power Hardware Management Console (HMC): V7 R3.5.0, V7 R7.1.0, V7 R7.2.0, V7 R7.3.0
Systems Director Management Console (SDMC) V6 R7.3.0
Apply the fix for the appropriate HMC release.
HMC Service Packs and eFixes are available through FixCentral.
The FixCentral retrieval process for Power HMC starts at http://www-933.ibm.com/support/fixcentral/.
The links below are for the README files for the listed fixes.
HMC V7 R3.5.0 Service Pack 4 (MH01277_0929) (Link to README)
HMC V7 R7.1.0 – Move to V7 R7.2.0 or newer.
HMC V7 R7.2.0 Service Pack 3 (MH01276_1102) (Link to README)
HMC V7 R7.3.0 Service Pack 2 (MH01279_1207) (Link to README)
SDMC V6 R7.3.0 Service Pack 2 (MF54510) (Link to README)
Workaround:It is best to just apply the fix.
The vulnerability can be eliminated by disabling SSH access, however, this also removes access for all SSH operations.
None known, apply fixes.
Complete CVSS Guide
On-line Calculator V2
X-Force Vulnerability Database
IBM Secure Engineering Web Portal
IBM Product Security Incident Response Blog
7/31/2012: Original copy published.
8/1/2012: Updated formatting
8/7/2012: Removed * from end of a line
*The CVSS Environment Score is customer environment specific and will ultimately impact the Overall CVSS Score. Customers can evaluate the impact of this vulnerability in their environments by accessing the links in the Reference section of this Flash.
Note: According to the Forum of Incident Response and Security Teams (FIRST), the Common Vulnerability Scoring System (CVSS) is an "industry open standard designed to convey vulnerability severity and help to determine urgency and priority of response." IBM PROVIDES THE CVSS SCORES "AS IS" WITHOUT WARRANTY OF ANY KIND, INCLUDING THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. CUSTOMERS ARE RESPONSIBLE FOR ASSESSING THE IMPACT OF ANY ACTUAL OR POTENTIAL SECURITY VULNERABILITY.