Security Bulletin: Vulnerabiliies in libmspack affect PowerKVM

Summary

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

Vulnerability Details

CVEID: CVE-2018-14682 DESCRIPTION: libmspack is vulnerable to a denial of service, caused by an off-by-one in mspack/chmd.c in the TOLOWER() macro for CHM decompression. 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/147666&gt; 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-2018-14681 DESCRIPTION: libmspack could allow a remote attacker to overwrite arbitrary files, caused by an error in the kwajd_read_headers function in mspack/kwajd.c in libmspack. An attacker could exploit this vulnerability using bad KWAJ file header extensions to cause a one or two byte overwrite.
CVSS Base Score: 5.3
CVSS Temporal Score: See <https://exchange.xforce.ibmcloud.com/vulnerabilities/147669&gt; 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-2018-14680 DESCRIPTION: An unspecified error in libmspack related to the failure to reject blank CHM filenames has an unknown impact and attack vector.
CVSS Base Score: 5.3
CVSS Temporal Score: See <https://exchange.xforce.ibmcloud.com/vulnerabilities/147668&gt; 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-2018-14679 DESCRIPTION: libmspack is vulnerable to a denial of service, caused by an off-by-one error in the CHM PMGI/PMGL chunk number validity checks in mspack/chmd.c. A remote attacker could exploit this vulnerability to cause the application to crash.
CVSS Base Score: 5.3
CVSS Temporal Score: See <https://exchange.xforce.ibmcloud.com/vulnerabilities/147667&gt; 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)

Affected Products and Versions

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 starting with v3.1.0.2 update 17.

Workarounds and Mitigations

none