Security Bulletin: Vulnerabiliies in glibc affect PowerKVM

Summary

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

Vulnerability Details

CVEID: CVE-2018-11237 DESCRIPTION: GNU glibc is vulnerable to a buffer overflow, caused by improper bounds of checking by the __mempcpy_avx512_no_vzeroupper function. By executing a specially-crafted program, a local attacker could overflow a buffer and execute arbitrary code on the system.
CVSS Base Score: 7.8
CVSS Temporal Score: See <https://exchange.xforce.ibmcloud.com/vulnerabilities/143580&gt; for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H)

CVEID: CVE-2018-11236 DESCRIPTION: GNU glibc is vulnerable to a stack-based buffer overflow, caused by improper bounds of checking by the pathname arguments in the realpath function in stdlib/canonicalize.c. By using specially-crafted pathname arguments, a remote attacker could overflow a buffer and execute arbitrary code on the system.
CVSS Base Score: 7.3
CVSS Temporal Score: See <https://exchange.xforce.ibmcloud.com/vulnerabilities/143578&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:L/I:L/A:L)

CVEID: CVE-2018-6485 DESCRIPTION: GNU C Library is vulnerable to a denial of service, caused by an integer overflow in the implementation of the posix_memalign in memalign functions. A local attacker could exploit this vulnerability to cause the application to crash.
CVSS Base Score: 4
CVSS Temporal Score: See <https://exchange.xforce.ibmcloud.com/vulnerabilities/138627&gt; for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L)

CVEID: CVE-2017-16997 DESCRIPTION: GNU C Library could allow a local attacker to gain elevated privileges on the system, caused by a flaw in the elf/dl-load.c. By using a Trojan horse library, an attacker could exploit this vulnerability to gain elevated privileges on the system.
CVSS Base Score: 8.4
CVSS Temporal Score: See <https://exchange.xforce.ibmcloud.com/vulnerabilities/136491&gt; for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)

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