Important: quagga

Issue Overview:

Infinite loop issue triggered by invalid OPEN message allows denial-of-service
An infinite loop vulnerability was discovered in Quagga. A BGP peer could send specially crafted packets that would cause the daemon to enter an infinite loop, denying service and consuming CPU until it is restarted.(CVE-2018-5381)

Double free vulnerability in bgpd when processing certain forms of UPDATE message allowing to crash or potentially execute arbitrary code
A double-free vulnerability was found in Quagga. A BGP peer could send a specially crafted UPDATE message which would cause allocated blocks of memory to be free()d more than once, potentially leading to a crash or other issues.(CVE-2018-5379)

bgpd can overrun internal BGP code-to-string conversion tables potentially allowing crash
A vulnerability was found in Quagga, in the log formatting code. Specially crafted messages sent by BGP peers could cause Quagga to read one element past the end of certain static arrays, causing arbitrary binary data to appear in the logs or potentially, a crash.(CVE-2018-5380)

Affected Packages:

quagga

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

New Packages:

i686:  
    quagga-devel-0.99.22.4-4.17.amzn1.i686  
    quagga-0.99.22.4-4.17.amzn1.i686  
    quagga-debuginfo-0.99.22.4-4.17.amzn1.i686  
    quagga-contrib-0.99.22.4-4.17.amzn1.i686  
  
src:  
    quagga-0.99.22.4-4.17.amzn1.src  
  
x86_64:  
    quagga-devel-0.99.22.4-4.17.amzn1.x86_64  
    quagga-debuginfo-0.99.22.4-4.17.amzn1.x86_64  
    quagga-0.99.22.4-4.17.amzn1.x86_64  
    quagga-contrib-0.99.22.4-4.17.amzn1.x86_64  

Additional References

Red Hat: CVE-2018-5379, CVE-2018-5380, CVE-2018-5381

Mitre: CVE-2018-5379, CVE-2018-5380, CVE-2018-5381