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Security Bulletin: Multiple vulnerabilities in libxml2 affect PowerKVM

Description

## Summary PowerKVM is affected by several vulnerabilities in libxml2. These vulnerabilities are now fixed. ## Vulnerability Details **CVEID:** [_CVE-2015-1819_](<http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-1819>)** DESCRIPTION:** Libxml is vulnerable to a denial of service, caused by an XML External Entity Injection (XXE) error in the xmlreader when processing XML data. A remote attacker could exploit this vulnerability to consume all available memory resources. CVSS Base Score: 5.3 CVSS Temporal Score: See [_https://exchange.xforce.ibmcloud.com/vulnerabilities/107272_](<https://exchange.xforce.ibmcloud.com/vulnerabilities/107272>) for the current score CVSS Environmental Score*: Undefined CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L) **CVEID:** [_CVE-2015-5312_](<http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-5312>)** DESCRIPTION:** An unspecified error in Libxml2 related to an entity expansion flaw has an unknown impact and attack vector. CVSS Base Score: 5.3 CVSS Temporal Score: See [_https://exchange.xforce.ibmcloud.com/vulnerabilities/108319_](<https://exchange.xforce.ibmcloud.com/vulnerabilities/108319>) for the current score CVSS Environmental Score*: Undefined CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N) **CVEID:** [_CVE-2015-7497_](<http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-7497>)** DESCRIPTION:** Libxml2 is vulnerable to a denial of service, caused by a heap-based buffer overflow in the xmlDictComputeFastQKey() function. A remote attacker could exploit this vulnerability to cause a denial of service. CVSS Base Score: 5.3 CVSS Temporal Score: See [_https://exchange.xforce.ibmcloud.com/vulnerabilities/108320_](<https://exchange.xforce.ibmcloud.com/vulnerabilities/108320>) for the current score CVSS Environmental Score*: Undefined CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L) **CVEID:** [_CVE-2015-7498_](<http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-7498>)** DESCRIPTION:** An unspecified error in Libxml2 related to the processing of entities after encoding conversion failures have occured has an unknown impact and attack vector. CVSS Base Score: 5.3 CVSS Temporal Score: See [_https://exchange.xforce.ibmcloud.com/vulnerabilities/108321_](<https://exchange.xforce.ibmcloud.com/vulnerabilities/108321>) for the current score CVSS Environmental Score*: Undefined CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N) **CVEID:** [_CVE-2015-7499_](<http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-7499>)** DESCRIPTION:** An unspecified error in Libxml2 related to some parser errors has an unknown impact and attack vector. CVSS Base Score: 5.3 CVSS Temporal Score: See [_https://exchange.xforce.ibmcloud.com/vulnerabilities/108322_](<https://exchange.xforce.ibmcloud.com/vulnerabilities/108322>) for the current score CVSS Environmental Score*: Undefined CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N) **CVEID:** [_CVE-2015-7500_](<http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-7500>)** DESCRIPTION:** Libxml2 is vulnerable to a denial of service, caused by a memory access error when handling invalid entity boundaries. A remote attacker could exploit this vulnerability to cause a denial of service. CVSS Base Score: 5.3 CVSS Temporal Score: See [_https://exchange.xforce.ibmcloud.com/vulnerabilities/108323_](<https://exchange.xforce.ibmcloud.com/vulnerabilities/108323>) for the current score CVSS Environmental Score*: Undefined CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L) **CVEID:** [_CVE-2015-7941_](<http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-7941>)** DESCRIPTION:** Libxml2 is vulnerable to a denial of service, caused by a heap-based buffer overflow in the xmlParseEntityDecl or xmlParseConditionalSections function. By using specially-crafted XML data, a remote attacker could exploit this vulnerability to trigger an out-of-bounds read and cause the system to crash. CVSS Base Score: 4.3 CVSS Temporal Score: See [_https://exchange.xforce.ibmcloud.com/vulnerabilities/108071_](<https://exchange.xforce.ibmcloud.com/vulnerabilities/108071>) for the current score CVSS Environmental Score*: Undefined CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L) **CVEID:** [_CVE-2015-7942_](<http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-7942>)** DESCRIPTION:** Libxml2 is vulnerable to a denial of service, caused by a heap-based buffer overflow in the xmlParseConditionalSections function. By using specially-crafted XML data, a remote attacker could exploit this vulnerability to trigger an out-of-bounds read and cause the system to crash. CVSS Base Score: 4.3 CVSS Temporal Score: See [_https://exchange.xforce.ibmcloud.com/vulnerabilities/108073_](<https://exchange.xforce.ibmcloud.com/vulnerabilities/108073>) for the current score CVSS Environmental Score*: Undefined CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L) **CVEID:** [_CVE-2015-8241_](<http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-8241>)** DESCRIPTION:** libxml2 is vulnerable to a buffer overflow, caused by improper bounds checking by the XML parser in xmlNextChar. By using a malformed XML file, a local attacker could overflow a buffer and execute arbitrary code on the system or cause the application to crash. CVSS Base Score: 5.9 CVSS Temporal Score: See [_https://exchange.xforce.ibmcloud.com/vulnerabilities/108169_](<https://exchange.xforce.ibmcloud.com/vulnerabilities/108169>) for the current score CVSS Environmental Score*: Undefined CVSS Vector: (CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L) **CVEID:** [_CVE-2015-8242_](<http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-8242>)** DESCRIPTION:** libxml2 is vulnerable to a stack-based buffer overflow, caused by improper bounds checking by the HTML parser in push mode in xmlSAX2TextNode. By using a malformed XML file, a local attacker could overflow a buffer and execute arbitrary code on the system or cause the application to crash. CVSS Base Score: 5.9 CVSS Temporal Score: See [_https://exchange.xforce.ibmcloud.com/vulnerabilities/108170_](<https://exchange.xforce.ibmcloud.com/vulnerabilities/108170>) for the current score CVSS Environmental Score*: Undefined CVSS Vector: (CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L) **CVEID:** [_CVE-2015-8317_](<http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-8317>)** DESCRIPTION:** libxml2 is vulnerable to a heap-based buffer overflow, caused by improper bounds checking by the xmlParseXMLDecl function. By using a malformed XML file, a local attacker could overflow a buffer and execute arbitrary code on the system or cause the application to crash. CVSS Base Score: 5.9 CVSS Temporal Score: See [_https://exchange.xforce.ibmcloud.com/vulnerabilities/108316_](<https://exchange.xforce.ibmcloud.com/vulnerabilities/108316>) for the current score CVSS Environmental Score*: Undefined CVSS Vector: (CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L) ## 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_](<https://ibm.biz/BdHggw>) for 3.1 service build 3 or later. For version 2.1, the fix is made available via Fix Central ([_https://ibm.biz/BdEnT8_](<https://ibm.biz/BdEnT8>)) in 2.1.1 Build 65.6 and all later 2.1.1 SP3 service builds and 2.1.1 service packs. 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> for prerequisite fixes and instructions. ## Workarounds and Mitigations v2.1 customers can work around the problem by upgrading to the fixed release of v3.1 ## Get Notified about Future Security Bulletins Subscribe to [My Notifications](< http://www-01.ibm.com/software/support/einfo.html>) to be notified of important product support alerts like this. ### References [Complete CVSS v2 Guide](<http://www.first.org/cvss/v2/guide> "Link resides outside of ibm.com" ) [On-line Calculator v2](<http://nvd.nist.gov/CVSS-v2-Calculator> "Link resides outside of ibm.com" ) [Complete CVSS v3 Guide](<http://www.first.org/cvss/user-guide> "Link resides outside of ibm.com" ) [On-line Calculator v3](<http://www.first.org/cvss/calculator/3.0> "Link resides outside of ibm.com" ) Off ## Related Information [IBM Secure Engineering Web Portal](<http://www.ibm.com/security/secure-engineering/bulletins.html>) [IBM Product Security Incident Response Blog](<http://www.ibm.com/blogs/psirt>) ## Change History 29 January 2016 - Initial Version *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 Security Bulletin. ## Disclaimer 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. In addition to other efforts to address potential vulnerabilities, IBM periodically updates the record of components contained in our product offerings. As part of that effort, if IBM identifies previously unidentified packages in a product/service inventory, we address relevant vulnerabilities regardless of CVE date. Inclusion of an older CVEID does not demonstrate that the referenced product has been used by IBM since that date, nor that IBM was aware of a vulnerability as of that date. We are making clients aware of relevant vulnerabilities as we become aware of them. "Affected Products and Versions" referenced in IBM Security Bulletins are intended to be only products and versions that are supported by IBM and have not passed their end-of-support or warranty date. Thus, failure to reference unsupported or extended-support products and versions in this Security Bulletin does not constitute a determination by IBM that they are unaffected by the vulnerability. Reference to one or more unsupported versions in this Security Bulletin shall not create an obligation for IBM to provide fixes for any unsupported or extended-support products or versions. [{"Product":{"code":"SSZJY4","label":"PowerKVM"},"Business Unit":{"code":"BU054","label":"Systems w\/TPS"},"Component":"Not Applicable","Platform":[{"code":"PF016","label":"Linux"}],"Version":"2.1;3.1","Edition":"KVM","Line of Business":{"code":"LOB08","label":"Cognitive Systems"}}]


Affected Software


CPE Name Name Version
PowerKVM 2.1
PowerKVM 3.1

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