Protect `readLine()` against DoS

pixeebot[bot] commented 5 months ago

This change hardens all BufferedReader#readLine() operations against memory exhaustion.

There is no way to call readLine() safely since it is, by its nature, a read that must be terminated by the stream provider. Furthermore, a stream of data provided by an untrusted source could lead to a denial of service attack, as attackers can provide an infinite stream of bytes until the process runs out of memory.

Fixing it is straightforward using an API which limits the amount of expected characters to some sane limit. This is what our changes look like:

+ import io.github.pixee.security.BoundedLineReader;
  ...
  BufferedReader reader = getReader();
- String line = reader.readLine(); // unlimited read, can lead to DoS
+ String line = BoundedLineReader.readLine(reader, 5_000_000); // limited to 5MB

Micro-Learning Topic: Denial of service (Detected by phrase)

Matched on "denial of service"

The Denial of Service (DoS) attack is focused on making a resource (site, application, server) unavailable for the purpose it was designed. There are many ways to make a service unavailable for legitimate users by manipulating network packets, programming, logical, or resources handling vulnerabilities, among others. Source: https://www.owasp.org/index.php/Denial_of_Service

Try a challenge in Secure Code Warrior

performance-testing-bot[bot] commented 5 months ago

Unable to locate .performanceTestingBot config file

git-greetings[bot] commented 5 months ago

Thanks @pixeebot[bot] for opening this PR!

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git-greetings[bot] commented 5 months ago

PR Details of @pixeebot[bot] in vespa-engine-vespa :	OPEN	CLOSED	TOTAL
2	8	10

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pixeebot[bot] commented 4 months ago

I'm confident in this change, but I'm not a maintainer of this project. Do you see any reason not to merge it?

If this change was not helpful, or you have suggestions for improvements, please let me know!

pixeebot[bot] commented 4 months ago

Unless you expect (and want to handle) reading lines greater than 5MB, this change should be safe. You could also change the second argument to a set more aggressive or conservative limit.

If there are other concerns about this change, I'd love to hear about them!

pixeebot[bot] commented 4 months ago

This change may not be a priority right now, so I'll close it. If there was something I could have done better, please let me know!

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2lambda123 / vespa-engine-vespa