CVE-2017-9798

Apache httpd allows remote attackers to read secret data from process memory if the Limit directive can be set in a user's .htaccess file, or if httpd.conf has certain misconfigurations, aka Optionsbleed. This affects the Apache HTTP Server through 2.2.34 and 2.4.x through 2.4.27. The attacker sends an unauthenticated OPTIONS HTTP request when attempting to read secret data. This is a use-after-free issue and thus secret data is not always sent, and the specific data depends on many factors including configuration. Exploitation with .htaccess can be blocked with a patch to the ap_limit_section function in server/core.c.

We have discovered 321,526 live websites that are affected by CVE-2017-9798.

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Affected Software

Product	Apache
Category	Web Servers
Vulnerable Domains	321,526 live websites (13% of Apache install base)
Vulnerable Versions	from 0 through 2.2.34
Vulnerable Versions Count	57 versions ( 47% of all versions)