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Description
The software uses or specifies an encoding when generating output to a downstream component, but the specified encoding is not the same as the encoding that is expected by the downstream component.
Modes of Introduction:
Likelihood of Exploit:
Related Weaknesses
CWE-116
CWE-116
Consequences
Integrity, Confidentiality, Availability: Modify Application Data, Execute Unauthorized Code or Commands
An attacker could modify the structure of the message or data being sent to the downstream component, possibly injecting commands.
Potential Mitigations
Phase: Implementation
Effectiveness:
Description:
Use context-aware encoding. That is, understand which encoding is being used by the downstream component, and ensure that this encoding is used. If an encoding can be specified, do so, instead of assuming that the default encoding is the same as the default being assumed by the downstream component.
Phase: Architecture and Design
Effectiveness:
Description:
Where possible, use communications protocols or data formats that provide strict boundaries between control and data. If this is not feasible, ensure that the protocols or formats allow the communicating components to explicitly state which encoding/decoding method is being used. Some template frameworks provide built-in support.
Phase: Architecture and Design
Effectiveness:
Description:
CVE References
- CVE-2009-2814
- Server does not properly handle requests that do not contain UTF-8 data; browser assumes UTF-8, allowing XSS.
