ZDI-06-029: Ipswitch WS_FTP Server Checksum Command Parsing Buffer Overflow Vulnerabilities

Type securityvulns
Reporter Securityvulns
Modified 2006-09-27T00:00:00


ZDI-06-029: Ipswitch WS_FTP Server Checksum Command Parsing Buffer Overflow Vulnerabilities http://www.zerodayinitiative.com/advisories/ZDI-06-029.html September 26, 2006

-- CVE ID: CVE-2006-5000

-- Affected Vendor: Ipswitch

-- Affected Products: Ipswitch WS_FTP Server v5.04, v5.05

-- TippingPoint(TM) IPS Customer Protection: TippingPoint IPS customers have been protected against this vulnerability since September 26, 2006 by Digital Vaccine protection filter ID 4705. For further product information on the TippingPoint IPS:


-- Vulnerability Details: This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of Ipswitch WS_FTP Server. Anonymous access or authentication is required to exploit this vulnerability.

The specific flaw exists due to a lack of bounds checking during the parsing of long string arguments to the 'XCRC', 'XSHA1' and 'XMD5' commands leading to a stack overflow vulnerability. Exploitation requires valid or anonymous FTP server credentials.

-- Vendor Response: Ipswitch has issued an update, version 5.05 Hotfix 1, to correct this vulnerability. More details can be found at:


-- Disclosure Timeline: 2006.09.01 - Vulnerability reported to vendor 2006.09.26 - Digital Vaccine released to TippingPoint customers 2006.09.26 - Coordinated public release of advisory

-- Credit: This vulnerability was discovered by an anonymous researcher.

-- About the Zero Day Initiative (ZDI): Established by TippingPoint, a division of 3Com, The Zero Day Initiative (ZDI) represents a best-of-breed model for rewarding security researchers for responsibly disclosing discovered vulnerabilities.

Researchers interested in getting paid for their security research through the ZDI can find more information and sign-up at:


The ZDI is unique in how the acquired vulnerability information is used. 3Com does not re-sell the vulnerability details or any exploit code. Instead, upon notifying the affected product vendor, 3Com provides its customers with zero day protection through its intrusion prevention technology. Explicit details regarding the specifics of the vulnerability are not exposed to any parties until an official vendor patch is publicly available. Furthermore, with the altruistic aim of helping to secure a broader user base, 3Com provides this vulnerability information confidentially to security vendors (including competitors) who have a vulnerability protection or mitigation product.