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Miggo AIRoot Cause AnalysisThe vulnerability is a Denial of Service in the brace-expansion library. The max option, which is meant to limit the number of expanded items, was being checked too late in the process. The analysis of the patch c0b095bdc52bc4c36dc88deddbadabc49f8371e5 clearly shows that the expand_ function in src/index.ts contained the flawed logic. The for loop responsible for generating the sequence from a numeric or alphabetic range did not incorporate the max limit in its termination condition. This caused the application to generate all possible items from the range, even if the user only requested a small number, leading to excessive memory and CPU usage. The fix involves adding a check N.length < max to the loop condition, which ensures that the expansion stops as soon as the desired number of items is reached. Therefore, expand_ is the vulnerable function that would appear in a runtime profile during the exploitation of this vulnerability.
expand_src/index.ts
| Package Name | Ecosystem | Vulnerable Versions | First Patched Version |
|---|---|---|---|
| brace-expansion | npm | >= 5.0.0, < 5.0.6 | 5.0.6 |