Product A handles inputs or steps differently than Product B, which causes A to perform incorrect actions based on its perception of B's state.
This is generally found in proxies, firewalls, anti-virus software, and other intermediary devices that monitor, allow, deny, or modify traffic based on how the client or server is expected to behave.
Threat Mapped score: 1.8
Industry: Finiancial
Threat priority: P4 - Informational (Low)
CVE: CVE-2005-1215
Bypass filters or poison web cache using requests with multiple Content-Length headers, a non-standard behavior.
CVE: CVE-2002-0485
Anti-virus product allows bypass via Content-Type and Content-Disposition headers that are mixed case, which are still processed by some clients.
CVE: CVE-2002-1978
FTP clients sending a command with "PASV" in the argument can cause firewalls to misinterpret the server's error as a valid response, allowing filter bypass.
CVE: CVE-2002-1979
FTP clients sending a command with "PASV" in the argument can cause firewalls to misinterpret the server's error as a valid response, allowing filter bypass.
CVE: CVE-2002-0637
Virus product bypass with spaces between MIME header fields and the ":" separator, a non-standard message that is accepted by some clients.
CVE: CVE-2002-1777
AV product detection bypass using inconsistency manipulation (file extension in MIME Content-Type vs. Content-Disposition field).
CVE: CVE-2005-3310
CMS system allows uploads of files with GIF/JPG extensions, but if they contain HTML, Internet Explorer renders them as HTML instead of images.
CVE: CVE-2005-4260
Interpretation conflict allows XSS via invalid "<" when a ">" is expected, which is treated as ">" by many web browsers.
CVE: CVE-2005-4080
Interpretation conflict (non-standard behavior) enables XSS because browser ignores invalid characters in the middle of tags.
N/A
| Phase | Note |
|---|---|
| Architecture and Design | N/A |
| Implementation | N/A |
Intro: The paper "Insertion, Evasion, and Denial of Service: Eluding Network Intrusion Detection" [REF-428] shows that OSes varied widely in how they manage unusual packets, which made it difficult or impossible for intrusion detection systems to properly detect certain attacker manipulations that took advantage of these OS differences.
Intro: Null characters have different interpretations in Perl and C, which have security consequences when Perl invokes C functions. Similar problems have been reported in ASP [REF-429] and PHP.