Description
Cytrix has detected that the Version of Apache HTTP Server being used has a ‘Read after free in mod_http2’.
CVE-2017-9789 is categorized as a ‘Use After Free’ vulnerability (CWE-416).
A Use After Free occurs when we Reference memory after it has been freed. That can cause a program to crash, use unexpected values, or to execute codes.
If under stress, closing many connections, the HTTP/2 handling code in your Apache’s Version would sometimes access memory after it has been freed.
That may lead to unwanted results and and erratic behavior.
It could lead to a decrease in performance and interruptions in the availability of resources.
Recommendation
To fix CVE-2017-9789, upgrade the version of Apache HTTP Server being used to 2.4.27.
References
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-9789
https://cwe.mitre.org/data/definitions/416.html