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Vulnerability Details : CVE-2009-2521

Stack consumption vulnerability in the FTP Service in Microsoft Internet Information Services (IIS) 5.0 through 7.0 allows remote authenticated users to cause a denial of service (daemon crash) via a list (ls) -R command containing a wildcard that references a subdirectory, followed by a .. (dot dot), aka "IIS FTP Service DoS Vulnerability."
Publish Date : 2009-09-04 Last Update Date : 2018-10-12
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- CVSS Scores & Vulnerability Types

CVSS Score
Confidentiality Impact None (There is no impact to the confidentiality of the system.)
Integrity Impact None (There is no impact to the integrity of the system)
Availability Impact Partial (There is reduced performance or interruptions in resource availability.)
Access Complexity High (Specialized access conditions exist. It is hard to exploit and several special conditions must be satisfied to exploit)
Authentication Not required (Authentication is not required to exploit the vulnerability.)
Gained Access None
Vulnerability Type(s) Denial Of Service
CWE ID 399

- Related OVAL Definitions

Title Definition Id Class Family
IIS FTP Service DoS Vulnerability oval:org.mitre.oval:def:6508 windows
MS09-053: Vulnerabilities in FTP Service for Internet Information Services Could Allow Remote Code Execution (975254) oval:gov.nist.fdcc.patch:def:11602 windows
OVAL (Open Vulnerability and Assessment Language) definitions define exactly what should be done to verify a vulnerability or a missing patch. Check out the OVAL definitions if you want to learn what you should do to verify a vulnerability.

- Products Affected By CVE-2009-2521

# Product Type Vendor Product Version Update Edition Language
1 Application Microsoft IIS 5.0 Version Details Vulnerabilities
2 Application Microsoft IIS 6.0 Version Details Vulnerabilities
3 Application Microsoft IIS 7.0 Version Details Vulnerabilities

- Number Of Affected Versions By Product

Vendor Product Vulnerable Versions
Microsoft IIS 3

- References For CVE-2009-2521;[LN];Q975191
MSKB 975191
FULLDISC 20090903 Microsoft Internet Information Services 5.0/6.0 FTP SERVER DENIAL OF SERVICE ("Stack Exhaustion")
MS MS09-053
CERT TA09-286A

- Metasploit Modules Related To CVE-2009-2521

Microsoft IIS FTP Server LIST Stack Exhaustion
This module triggers Denial of Service condition in the Microsoft Internet Information Services (IIS) FTP Server 5.0 through 7.0 via a list (ls) -R command containing a wildcard. For this exploit to work in most cases, you need 1) a valid ftp account: either read-only or write-access account 2) the "FTP Publishing" must be configured as "manual" mode in startup type 3) there must be at least one directory under FTP root directory. If your provided an FTP account has write-access privilege and there is no single directory, a new directory with random name will be created prior to sending exploit payload.
Module type : auxiliary Rank : normal

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