Security Bulletin: Vulnerabilities in TigerVNC affect PowerKVM

Summary

PowerKVM is affected by vulnerabilities in TigerVNC. IBM has now addressed these vulnerabilities.

Vulnerability Details

CVEID: CVE-2014-8240**
DESCRIPTION:** TigerVNC is vulnerable to a heap-based buffer overflow, caused by an integer overflow in the MallocFrameBuffer function in vncviewer.c. An attacker could exploit this vulnerability using an advertisement for a large screen size to overflow a buffer and execute arbitrary code on the system or cause the application to crash.
CVSS Base Score: 7.5
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/96947 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (AV:N/AC:L/Au:N/C:P/I:P/A:P)

CVEID: CVE-2014-8241**
DESCRIPTION:** TigerVNC is vulnerable to a denial of service, caused by a NULL pointer dereference in XRegion. A remote attacker could exploit this vulnerability to cause the client to crash.
CVSS Base Score: 5
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/96948 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (AV:N/AC:L/Au:N/C:N/I:N/A:P)

Affected Products and Versions

PowerKVM 2.1 and PowerKVM 3.1

Remediation/Fixes

Customers can update PowerKVM systems by using “yum update”.

Fix images are made available via Fix Central. For version 3.1, see https://ibm.biz/BdHggw. This issue is addressed as of 3.1.0.2 update 5 or later.

For version 2.1, see https://ibm.biz/BdEnT8. This issue is addressed as of PowerKVM 2.1.1.3-65 update 15 or later. Customers running v2.1 are, in any case, encouraged to upgrade to v3.1.

For v2.1 systems currently running fix levels of PowerKVM prior to 2.1.1, please see <http://download4.boulder.ibm.com/sar/CMA/OSA/05e4c/0/README&gt; for prerequisite fixes and instructions.

Workarounds and Mitigations

None