Dependabot Alert: Werkzeug DoS: High resource usage when parsing multipart/form-data containing a large part with CR/LF character at the beginning

[JennaySDavis]

Severity - Moderate

Werkzeug multipart data parser needs to find a boundary that may be between consecutive chunks. That's why parsing is based on looking for newline characters. Unfortunately, code looking for partial boundary in the buffer is written inefficiently, so if we upload a file that starts with CR or LF and then is followed by megabytes of data without these characters: all of these bytes are appended chunk by chunk into internal bytearray and lookup for boundary is performed on growing buffer.

This allows an attacker to cause a denial of service by sending crafted multipart data to an endpoint that will parse it. The amount of CPU time required can block worker processes from handling legitimate requests. The amount of RAM required can trigger an out of memory kill of the process. If many concurrent requests are sent continuously, this can exhaust or kill all available workers.

[JennaySDavis]

#160 Acceptance Criteria

Pass/Fail	Description
I Pass	Hyperlinks are operational
Pass	Downloading PDF
Pass	Results returned from a search
Pass	Various screen sizes display the application properly

Comments/Additional Notes
This testing was a smoke testing of the 889 tool.

ADA Compliance (Automated scan via Chrome Lighthouse)

Criteria	Score
Performance	96
Accessibility	100
Best Practices	93

Passed 01/29/2024 - JSD

[LoraBradford]

@JennaySDavis does the bug on story #185 affect this one also?

[JennaySDavis]

@LoraBradford the minor issue with aria labels will apply to the entire 889 Tool. See https://github.com/orgs/GSA/projects/116/views/3?pane=issue&itemId=51527311

[LoraBradford]

@JennaySDavis thank you for the clarification! Moving this to done!