CVE-2021-32740
Regular Expression Denial of Service in Addressable templates
Impact
### 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 - https://owasp.org/www-community/attacks/Regular_expression_Denial_of_Service_-_ReDoS - https://cwe.mitre.org/data/definitions/1333.html - https://www.regular-expressions.info/catastrophic.html ### For more information If you have any questions or comments about this advisory: * [Open an issue](https://github.com/sporkmonger/addressable/issues)
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| rubygems | addressable | >= 2.3.0, <= 2.7.0 | 2.8.0 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Addressable Project | Addressable | from 2.3.0 before 2.8.0 |
| Fedoraproject | Fedora | Versions 33, 34 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/sporkmonger/addressable/commit/0d8a3127e35886ce9284810a7f2438bff6b43cbc
- https://github.com/sporkmonger/addressable/security/advisories/GHSA-jxhc-q857-3j6g
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SDFQM2NHNAZ3NNUQZEJTYECYZYXV4UDS/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WYPVOOQU7UB277UUERJMCNQLRCXRCIQ5/
- https://github.com/advisories/GHSA-jxhc-q857-3j6g
- https://github.com/sporkmonger/addressable/commit/89c76130ce255c601f642a018cb5fb5a80e679a7
- https://nvd.nist.gov/vuln/detail/CVE-2021-32740
- https://github.com/sporkmonger/addressable/commit/92685096b1f7235ed8986c03ce30a24972eed848#diff-fb36d3dc67e6565ffde17e666a98697f48e76dac38fabf1bb9e97cdf3b583d76
- https://github.com/rubysec/ruby-advisory-db/blob/master/gems/addressable/CVE-2021-32740.yml
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/SDFQM2NHNAZ3NNUQZEJTYECYZYXV4UDS
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/WYPVOOQU7UB277UUERJMCNQLRCXRCIQ5