Limit readline()

[pixeebot[bot]]

This codemod hardens all readline() calls from file objects returned from an open() call, StringIO and BytesIO against denial of service attacks. A stream influenced by an attacker could keep providing bytes until the system runs out of memory, causing a crash.

Fixing it is straightforward by providing adding a size argument to any readline() calls. The changes from this codemod look like this:

  file = open('some_file.txt')
- file.readline()
+ file.readline(5_000_000)

More reading

* [https://cwe.mitre.org/data/definitions/400.html](https://cwe.mitre.org/data/definitions/400.html)

I have additional improvements ready for this repo! If you want to see them, leave the comment:

@pixeebot next

... and I will open a new PR right away!

Powered by: pixeebot (codemod ID: pixee:python/limit-readline)

[cr-gpt[bot]]

Seems you are using me but didn't get OPENAI_API_KEY seted in Variables/Secrets for this repo. you could follow readme for more information

[code-companion-ai[bot]]

Processing PR updates...

[git-greetings[bot]]

Thanks @pixeebot[bot] for opening this PR!

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[secure-code-warrior-for-github[bot]]

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

[codesyncapp[bot]]

Check out the playback for this Pull Request here.

[performance-testing-bot[bot]]

Unable to locate .performanceTestingBot config file

[git-greetings[bot]]

PR Details of @pixeebot[bot] in zalando-patroni :	OPEN	CLOSED	TOTAL
1	2	3

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[pixeebot[bot]]

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]]

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!

You can also customize me to make sure I'm working with you in the way you want.