Signature Detail
Short Name |
FTP:DOS:ASTERISK |
|---|---|
Severity |
Medium |
Recommended |
No |
Recommended Action |
Drop |
Category |
FTP |
Keywords |
Excessive Wildcard Denial of Service |
Release Date |
2003/05/08 |
Update Number |
1213 |
Supported Platforms |
di-5.3+, idp-4.0+, isg-3.0+, j-series-9.5+, mx-9.4+, srx-9.2+, srx-branch-9.4+, vsrx-12.1+ |
FTP: Excessive Wildcard Denial of Service
This signature detects denial-of-service (DoS) attempts against Microsoft FTP Service in Microsoft IIS 4.0, 5.0 and Wu-FTP. Attackers who have previously established an FTP session can send glob characters within a maliciously crafted NLST request to crash the server.
Extended Description
Due to a flaw in the pattern-matching function used by FTP commands, denial of service attacks can be successfully launched. If a user submits an FTP command along with a filename containing specially placed wildcard sequences, the pattern-matching function will not allocate sufficent memory. Resulting in IIS experiencing denial of service condition.
Affected Products
- Microsoft IIS 4.0
- Microsoft IIS 5.0
References