SERVER-APACHE -- Snort has detected traffic exploiting vulnerabilities in Apache servers.
SERVER-APACHE Apache HTTP Server possible OPTIONS method memory leak attempt
Apache HTTP Server versions 2.2.34 and 2.4.x through 2.4.27 are vulnerable to a memory leak via the HTTP OPTIONS method. This rule looks for multiple attempts being made using the OPTIONS method to a target system.
What To Look For
This event is generated when multiple HTTP OPTIONS methods are set to a target system.
No public information
No known false positives
Cisco Talos Intelligence Group
MITRE ATT&CK Framework
Technique: Exfiltration Over Other Network Medium
For reference, see the MITRE ATT&CK vulnerability types here:
CVE Additional Information
CVE-2017-9798Apache 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.
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