Techniques Try to use UTF-8 encoding of content in Scripts in order to bypass validation routines.
Utf 8 Decode Tool Code Potentially HarmfulThis attack leverages the possibility to encode potentially harmful input in UTF-8 and submit it to applications not expecting or effective at validating this encoding standard making input filtering difficult.UTF-8 (8-bit UCSUnicode Transformation Format) is a variable-length character encoding for Unicode.However, early version of the UTF-8 specification got some entries wrong (in some cases it permitted overlong characters).UTF-8 encoders are supposed to use the shortest possible encoding, but naive decoders may accept encodings that are longer than necessary. According to the RFC 3629, a particularly subtle form of this attack can be carried out against a parser which performs security-critical validity checks against the UTF-8 encoded form of its input, but interprets certain illegal octet sequences as characters. Likelihood Of Attack High Typical Severity High Relationships This table shows the other attack patterns and high level categories that are related to this attack pattern. These relationships are defined as ChildOf and ParentOf, and give insight to similar items that may exist at higher and lower levels of abstraction. In addition, relationships such as CanFollow, PeerOf, and CanAlsoBe are defined to show similar attack patterns that the user may want to explore. Nature Type ID Name ChildOf Standard Attack Pattern - A standard level attack pattern in CAPEC is focused on a specific methodology or technique used in an attack. It is often seen as a singular piece of a fully executed attack. A standard level attack pattern is a specific type of a more abstract meta level attack pattern. Leverage Alternate Encoding PeerOf Detailed Attack Pattern - A detailed level attack pattern in CAPEC provides a low level of detail, typically leveraging a specific technique and targeting a specific technology, and expresses a complete execution flow. Detailed attack patterns are more specific than meta attack patterns and standard attack patterns and often require a specific protection mechanism to mitigate actual attacks. A detailed level attack pattern often will leverage a number of different standard level attack patterns chained together to accomplish a goal. Using Slashes and URL Encoding Combined to Bypass Validation Logic PeerOf Detailed Attack Pattern - A detailed level attack pattern in CAPEC provides a low level of detail, typically leveraging a specific technique and targeting a specific technology, and expresses a complete execution flow. Using Unicode Encoding to Bypass Validation Logic This table shows the views that this attack pattern belongs to and top level categories within that view. View Name Top Level Categories Domains of Attack Software Mechanisms of Attack Manipulate Data Structures Execution Flow Explore Survey the application for user-controllable inputs: Using a browser or an automated tool, an attacker follows all public links and actions on a web site. They record all the links, the forms, the resources accessed and all other potential entry-points for the web application. Techniques Use a spidering tool to follow and record all links and analyze the web pages to find entry points. Make special note of any links that include parameters in the URL. Utf 8 Decode Tool Manual Traversal OfUse a proxy tool to record all user input entry points visited during a manual traversal of the web application. Use a browser to manually explore the website and analyze how it is constructed. Many browsers plugins are available to facilitate the analysis or automate the discovery.
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