Security update for ntp

SUSE Security Update: Security update for ntp
Announcement ID: SUSE-SU-2020:14415-1
Rating: moderate
References: #1169740 #1171355 #1172651 #1173334
Cross-References:CVE-2018-8956 CVE-2020-11868 CVE-2020-13817 CVE-2020-15025
Affected Products:
  • SUSE Linux Enterprise Server 11-SP4-LTSS
  • SUSE Linux Enterprise Debuginfo 11-SP4

An update that fixes four vulnerabilities is now available.


This update for ntp fixes the following issues:
ntp was updated to 4.2.8p15

  • CVE-2020-11868: Fixed an issue which a server mode packet with spoofed source address frequently send to the client ntpd could have caused denial of service (bsc#1169740).
  • CVE-2018-8956: Fixed an issue which could have allowed remote attackers to prevent a broadcast client from synchronizing its clock with a broadcast NTP server via spoofed mode 3 and mode 5 packets (bsc#1171355).
  • CVE-2020-13817: Fixed an issue which an off-path attacker with the ability to query time from victim's ntpd instance could have modified the victim's clock by a limited amount (bsc#1172651).
  • CVE-2020-15025: Fixed an issue which remote attacker could have caused denial of service by consuming the memory when a CMAC key was used andassociated with a CMAC algorithm in the ntp.keys (bsc#1173334).

Patch Instructions:

To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".
Alternatively you can run the command listed for your product:

  • SUSE Linux Enterprise Server 11-SP4-LTSS:
    zypper in -t patch slessp4-ntp-14415=1
  • SUSE Linux Enterprise Debuginfo 11-SP4:
    zypper in -t patch dbgsp4-ntp-14415=1

Package List:

  • SUSE Linux Enterprise Server 11-SP4-LTSS (i586 ppc64 s390x x86_64):
    • ntp-4.2.8p15-64.16.1
    • ntp-doc-4.2.8p15-64.16.1
  • SUSE Linux Enterprise Debuginfo 11-SP4 (i586 ppc64 s390x x86_64):
    • ntp-debuginfo-4.2.8p15-64.16.1
    • ntp-debugsource-4.2.8p15-64.16.1