SID 1:57909

Report a false positive

Rule Category

SERVER-WEBAPP -- Snort has detected traffic exploiting vulnerabilities in web based applications on servers.

Alert Message

SERVER-WEBAPP Microsoft Exchange autodiscover server side request forgery attempt

Rule Explanation

This rule looks for attempts to exploit a server side request forgery vulnerability in Microsoft Exchange servers.

What To Look For

This rule looks for attempts to exploit a server side request forgery vulnerability in Microsoft Exchange servers.

Known Usage

No public information

False Positives

No known false positives

Contributors

Cisco Talos Intelligence Group

Rule Groups

No rule groups

CVE

CVE-2021-31207 CVE-2021-34473 CVE-2021-34523

Additional Links

portal.msrc.microsoft.com/en-us/security-guidance/advisory/CVE-2021-34473
portal.msrc.microsoft.com/en-us/security-guidance/advisory/CVE-2021-34523
portal.msrc.microsoft.com/en-us/security-guidance/advisory/CVE-2021-31207

Rule Vulnerability

Server-Side Request Forgery

Server-Side Request Forgery (SSRF) attackers abuse functionality on the server to read or update internal resources. The attacker can supply or modify a URL for the server to read or submit data to. By carefully selecting the URLs, the attacker may be able to read server configuration such as AWS metadata, connect to internal services like http enabled databases or perform post requests for internal services which are not intended to be exposed.

CVE Additional Information

This product uses data from the NVD API but is not endorsed or certified by the NVD.
CVE-2021-31207
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CVE-2021-34473
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CVE-2021-34523
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MITRE ATT&CK Framework

Tactic: Initial Access

Technique: Exploit Public-Facing Application

For reference, see the MITRE ATT&CK vulnerability types here: https://attack.mitre.org