Low: ntp

Issue Overview:

ntpd in ntp 4.2.x before 4.2.8p7 allows authenticated users that know the private symmetric key to create arbitrarily-many ephemeral associations in order to win the clock selection of ntpd and modify a victim’s clock via a Sybil attack. This issue exists because of an incomplete fix for CVE-2016-1549.(CVE-2018-7170)

The ntpq and ntpdc command-line utilities that are part of ntp package are vulnerable to stack-based buffer overflow via crafted hostname. Applications using these vulnerable utilities with an untrusted input may be potentially exploited, resulting in a crash or arbitrary code execution under privileges of that application.(CVE-2018-12327)

Affected Packages:

ntp

Issue Correction:
Run yum update ntp to update your system.

New Packages:

i686:  
    ntpdate-4.2.8p12-1.39.amzn1.i686  
    ntp-4.2.8p12-1.39.amzn1.i686  
    ntp-debuginfo-4.2.8p12-1.39.amzn1.i686  
  
noarch:  
    ntp-perl-4.2.8p12-1.39.amzn1.noarch  
    ntp-doc-4.2.8p12-1.39.amzn1.noarch  
  
src:  
    ntp-4.2.8p12-1.39.amzn1.src  
  
x86_64:  
    ntp-debuginfo-4.2.8p12-1.39.amzn1.x86_64  
    ntp-4.2.8p12-1.39.amzn1.x86_64  
    ntpdate-4.2.8p12-1.39.amzn1.x86_64  

Additional References

Red Hat: CVE-2018-12327, CVE-2018-7170

Mitre: CVE-2018-12327, CVE-2018-7170