Security Bulletin: Vulnerabilities in Ghostscript affect PowerKVM

Summary

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

Vulnerability Details

CVEID: CVE-2018-16542 DESCRIPTION: Artifex Ghostscript is vulnerable to a denial of service, caused by an improper interpreter stack-size checking. By persuading a victim to open a specially-crafted file, a remote attacker could exploit this vulnerability to crash the interpreter.
CVSS Base Score: 5.5
CVSS Temporal Score: See <https://exchange.xforce.ibmcloud.com/vulnerabilities/149468&gt; for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H)

CVEID: CVE-2018-16509 DESCRIPTION: Artifex Ghostscript could allow a remote attacker to execute arbitrary code on the system, caused by improper privilege checking in the handling of /invalidaccess exceptions. By persuading a victim to open a specially-crafted file, an attacker could exploit this vulnerability to execute arbitrary code on the system.
CVSS Base Score: 7.8
CVSS Temporal Score: See <https://exchange.xforce.ibmcloud.com/vulnerabilities/149460&gt; for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H)

CVEID: CVE-2018-15910 DESCRIPTION: Artifex Ghostscript could allow a remote attacker to execute arbitrary code on the system, caused by a type confusion in the LockDistillerParams parameter. An attacker could exploit this vulnerability to crash the interpreter or possibly execute arbitrary code on the system.
CVSS Base Score: 7.3
CVSS Temporal Score: See <https://exchange.xforce.ibmcloud.com/vulnerabilities/148958&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-2018-10194 DESCRIPTION: Artifex Ghostscript is vulnerable to a stack-based buffer overflow, caused by improper bounds checking by the set_text_distance function in devices/vector/gdevpdts.c in the pdfwrite component. By persuading a victim to open a specially-crafted file, a remote attacker could overflow a buffer and execute arbitrary code or cause a denial of service condition on the system.
CVSS Base Score: 7.8
CVSS Temporal Score: See <https://exchange.xforce.ibmcloud.com/vulnerabilities/142088&gt; for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:L/AC:L/PR:N/UI:R/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 16.

Workarounds and Mitigations

none