545.txt

snort入侵检测规则文件2.4 Snort是众所周知的网络入侵检测工具

Rule:  

--
Sid: 
545

--
Summary: 
This event is generated when an attempt is made to navigate in an FTP sessions to a hidden directory named "/ ".

--
Impact: 
Unauthorized file storage.  An attacker may attempt to navigate on an FTP server to the "/ " directory to list or store unauthorized files such as unlicensed software.

--
Detailed Information: 
An attacker may attempt to hide unauthorized files in a hidden directory named "/ ".   This hidden directory is hard to discover, permitting attackers to store unauthorized "warez" files, such as unlicensed or pirated software. 

--
Affected Systems: 
FTP servers

--
Attack Scenarios: 
An attacker may navigate to the hidden directory named "/ " to list or store unauthorized files.

--
Ease of Attack: 
Simple.

--
False Positives: 
It is remotely possible that an authorized directory exists named "/ ".

--
False Negatives: 
Hidden directories other than those named "/ " may be used to store "warez" files.

--
Corrective Action: 
Assign restrictive permissions to all directories so unauthorized users cannot navigate or write to them.

Regularly monitor directories for sudden or drastic increased use of space.

--
Contributors: 
Original rule writer unknown
Modified by Brian Caswell <[e-mail]>
Snort documentation contributed by Chaos <[e-mail]>
Sourcefire Research Team
Judy Novak <[e-mail]>


-- 
Additional References:

--