Security Bulletin: Vulnerabilities in Mozilla Firefox libgraphite affect PowerKVM (CVE-2016-1521, CVE-2016-1522, CVE-2016-1523, CVE-2016-1526)

Summary

PowerKVM is affected by vulnerabilities in Mozilla Firefox libgraphite (graphite2). These vulnerabilities are now fixed.

Vulnerability Details

CVEID: CVE-2016-1521**
DESCRIPTION:** Libgraphite, as used in Mozilla Firefox, could allow a remote attacker to execute arbitrary code on the system, caused by an error in the directrun function when handling malicious fonts. An attacker could exploit this vulnerability using a specially crafted Graphite smart font to execute arbitrary code on the system, obtain sensitive information, or cause the application to crash.
CVSS Base Score: 8.8
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/110666 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H)

CVEID: CVE-2016-1522**
DESCRIPTION:** Libgraphite, as used in Mozilla Firefox, is vulnerable to a heap-based buffer overflow, caused by improper bounds checking by the bidirectional font handling functionality. By using a specially crafted Graphite smart font, a remote attacker could overflow a buffer and execute arbitrary code on the system or trigger a NULL pointer dereference and cause the application to crash.
CVSS Base Score: 8.8
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/110667 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H)

CVEID: CVE-2016-1523**
DESCRIPTION:** Mozilla Firefox could allow a remote attacker to execute arbitrary code on the system, caused by the improper validation of internal instruction parameters in the Graphite 2 library using special CNTXT_ITEM instructions. By persuading a victim to visit a specially crafted Web site, an attacker could exploit this vulnerability to execute arbitrary code on the system.
CVSS Base Score: 8.8
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/110569 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H)

CVEID: CVE-2016-1526**
DESCRIPTION:** Libgraphite, as used in Mozilla Firefox, is vulnerable to a denial of service, caused by the improper validation of a size value by the TtfUtil:LocaLookup function in TtfUtil.cpp. An attacker could exploit this vulnerability using a specially crafted Graphite smart font to obtain sensitive information or cause the application to crash.
CVSS Base Score: 8.1
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/110769 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H)

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 for 3.1.0.1 update 2 or later.

For version 2.1, see PowerKVM 2.1.1.3-65. Update 9 at https://ibm.biz/BdEnT8 and all later 2.1.1 service updates. 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.