Title: Microsoft IIS FTP Denial of Service Vulnerability
Severity: MODERATE
Description:
A vulnerability exists in the handling of certain user requests in IIS's FTP servcie.
Pattern-matching function is a function which supports the use of wildcards in filenames and is used by all the FTP commands. The function is used to expand the wildcards and match the patterns to the filenames.
The pattern-matching function used by a certain FTP command, contains a flaw which may result in a denial of service condition. 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 a denial of service condition. All current IIS sessions will disconnect and any new sessions will be refused, until the service has been restarted.
If successfully exploited on IIS 5.0, the server will automatically restart itself. It is possible that a log of the attack will not be recorded.
A manual restart of IIS 4.0 is required in order to gain normal functionality.
Affected Products:
- Cisco Building Broadband Service Manager 5.0.0
- Cisco Call Manager 1.0.0
- Cisco Call Manager 2.0.0
- Cisco Call Manager 3.0.0
- Cisco ICS 7750 0.0.0
- Cisco IP/VC 3540 Video Rate Matching Module 0.0.0
- Cisco Unity Server 2.0.0
- Cisco Unity Server 2.2.0
- Cisco Unity Server 2.3.0
- Cisco Unity Server 2.4.0
- Cisco uOne 1.0.0
- Cisco uOne 2.0.0
- Cisco uOne 3.0.0
- Cisco uOne 4.0.0
- Microsoft BackOffice 4.0.0
- Microsoft BackOffice 4.5.0
- Microsoft IIS 4.0.0
- Microsoft IIS 5.0
- Microsoft Windows 2000 Advanced Server
- Microsoft Windows 2000 Professional
- Microsoft Windows 2000 Server
- Microsoft Windows NT 4.0 Option Pack
References:
- Microsoft: Microsoft Security Bulletin MS02-026
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