Qbik WinGate SMTP server denial of service

qbik-smtp-dos (35950) The risk level is classified as MediumMedium Risk


Qbik WinGate is vulnerable to a denial of service, caused by a format string vulnerability when the SMTP server component improperly handles an SMTP client session. By persuading a victim to connect to an SMTP server, a remote attacker could send a specially-crafted SMTP command containing malicious format specifiers to crash the process.


Base Score: 2.8
  Access Vector: Remote
  Access Complexity: High
  Authentication: Not Required
  Confidentiality Impact: None
  Integrity Impact: None
  Availability Impact: Partial
Temporal Score: 2.1
  Exploitability: Unproven
  Remediation Level: Official-Fix
  Report Confidence: Confirmed


Denial of Service


Upgrade to the latest version of Qbik WinGate (6.2.2 or later), available from the Qbik WinGate Web site. See References.


  • BugTraq Mailing List, Thu Aug 09 2007 - 23:28:42 CDT : [HS-A007] Qbik WinGate Remote Denial of Service.
  • Qbik WinGate Web site: Qbik: - WinGate, WinGate VPN, NetPatrol.
  • BID-25272: WinGate SMTP Session Invalid State Remote Denial Of Service Vulnerability
  • BID-25303: Qbik WinGate SMTP Service Command Format String Vulnerability
  • CVE-2007-4335: Format string vulnerability in the SMTP server component in Qbik WinGate 5.x and 6.x before 6.2.2 allows remote attackers to cause a denial of service (service crash) via format string specifiers in certain unexpected commands, which trigger a crash during error logging.
  • OSVDB ID: 39535: WinGate SMTP Server Component Remote Format String DoS
  • SA26412: Qbik WinGate SMTP Service Format String Vulnerabilities

Platforms Affected:

  • Qbik WinGate 5.x prior to 6.2.2


Aug 10, 2007

The information within this database may change without notice. Use of this information constitutes acceptance for use in an AS IS condition. There are NO warranties, implied or otherwise, with regard to this information or its use. Any use of this information is at the user's risk. In no event shall the author/distributor (IBM Internet Security Systems X-Force) be held liable for any damages whatsoever arising out of or in connection with the use or spread of this information.

For corrections or additions please email ignore thisxforceignore this@ignore thisus.ignore thisibm.comignore this

Return to the main page