Strikethrough: fix exponential backtracking #95
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A long sequence of backslashes inside a strikethrough could confuse the strikethrough regex into exponential backtracking, causing a potential ReDoS vulnerability. This commit updates the strikethrough regex to only accept a backslash if it is preceding an escaped character, as other rules handle backslashes. Updates to version 0.7.3 to publish this fix. Thanks to @pwntester and the [GitHub Security Lab team](https://securitylab.github.com/) for finding this vulnerability! Test plan: 1. `make test` * verify the new strikethrough backtracking test passes * verify all the prior tests pass
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Sorry I missed your name when I first read the report, but thanks for testing and finding this @erik-krogh ! |
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A long sequence of backslashes inside a strikethrough could confuse the
strikethrough regex into exponential backtracking, causing a potential
ReDoS vulnerability.
This commit updates the strikethrough regex to only accept a backslash
if it is preceding an escaped character, as other rules handle
backslashes.
Updates to version 0.7.3 to publish this fix.
Thanks to @erik-krogh , @pwntester and the rest of the
GitHub Security Lab team
for finding this vulnerability!
Test plan:
make test