Security Bulletin: Multiple vulnerabilities in ntp affect PowerKVM

Vulnerability Details

CVEID: CVE-2015-5300
DESCRIPTION: Network Time Protocol (NTP) could allow a remote attacker to bypass security restrictions, caused by the failure to correctly implement the threshold limitation for the '-g' option. An attacker could exploit this vulnerability using man-in-the-middle techniques to intercept NTP traffic and make multiple steps larger than the panic threshold.
CVSS Base Score: 4.3
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/107594 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:L/A:N)

CVEID: CVE-2015-7704
DESCRIPTION: Network Time Protocol (NTP) is vulnerable to a denial of service, caused by an error in the rate-limiting mechanism. By sending spoofed Kiss-o'-Death packets, an attacker could exploit this vulnerability to disable NTP at a victim client.
CVSS Base Score: 7.5
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/107446 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:H)

CVEID: CVE-2016-1547
DESCRIPTION: NTP is vulnerable to a denial of service, caused by the demobilization of a preemptable client association. By sending specially crafted crypto NAK packets, an attacker could exploit this vulnerability to cause a denial of service.
CVSS Base Score: 3.7
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/112739 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L)

CVEID: CVE-2016-1548
DESCRIPTION: NTP could allow a remote attacker to bypass security restrictions, caused by an error in the ntpd client. By changing the client from basic client/server mode to interleaved symmetric mode, an attacker could exploit this vulnerability to modify the time of the client or cause a denial of service.
CVSS Base Score: 7.2
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/112740 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:L)

CVEID: CVE-2016-1550
DESCRIPTION: NTP could allow a local attacker to bypass security restrictions, caused by the failure to use a constant-time memory comparison function when validating the authentication digest on incoming packets. By sending a specially crafted packet with an authentication payload, an attacker could exploit this vulnerability to conduct a timing attack to compute the value of the valid authentication digest.
CVSS Base Score: 4
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/112742 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N)

CVEID: CVE-2016-2518
DESCRIPTION: NTP is vulnerable to a denial of service, caused by an error when using a specially crafted packet to create a peer association with hmode > 7. An attacker could exploit this vulnerability to cause the MATCH_ASSOC() function to trigger an out-of-bounds read.
CVSS Base Score: 2
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/112746 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:N/AC:H/PR:H/UI:R/S:U/C:N/I:N/A:L)