var-200106-0115
Vulnerability from variot
Directory traversal vulnerability in IIS 5.0 and earlier allows remote attackers to execute arbitrary commands by encoding .. (dot dot) and "\" characters twice. When IIS receives a CGI filename request, it automatically performs two actions before completing the request: 1. IIS decodes the filename to determine the filetype and the legitimacy of the file. IIS then carries out a security check. 2. When the security check is completed, IIS decodes CGI parameters. A flaw in IIS involves a third undocumented action: Typically, IIS decodes only the CGI parameter at this point, yet the previously decoded CGI filename is mistakenly decoded twice. If a malformed filename is submitted and circumvents the initial security check, the undocumented procedure will decode the malformed request, possibly allowing the execution of arbitrary commands. Note that arbitrary commands will be run with the IUSR_machinename account privileges. Reportedly, various encoding combinations under Windows 2000 Server and Professional may yield different outcomes. Personal Web Server 1.0 and 3.0 are reported vulnerable to this issue. The worm Nimda(and variants) actively exploit this vulnerability
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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