Regular Expression Denial of Service in Addressable templates
High severity
GitHub Reviewed
Published
Jul 3, 2021
in
sporkmonger/addressable
•
Updated May 4, 2023
Description
Published by the National Vulnerability Database
Jul 6, 2021
Reviewed
Jul 6, 2021
Published to the GitHub Advisory Database
Jul 12, 2021
Last updated
May 4, 2023
Impact
Within the URI template implementation in Addressable, a maliciously crafted template may result in uncontrolled resource consumption, leading to denial of service when matched against a URI. In typical usage, templates would not normally be read from untrusted user input, but nonetheless, no previous security advisory for Addressable has cautioned against doing this. Users of the parsing capabilities in Addressable but not the URI template capabilities are unaffected.
Patches
The vulnerability was introduced in version 2.3.0 (previously yanked) and has been present in all subsequent versions up to, and including, 2.7.0. It is fixed in version 2.8.0.
Workarounds
The vulnerability can be avoided by only creating Template objects from trusted sources that have been validated not to produce catastrophic backtracking.
References
For more information
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References