Waitress version 1.4.2 allows a DOS attack When waitress receives a header that contains invalid characters. When a header like "Bad-header: xxxxxxxxxxxxxxx\x10" is received, it will cause the regular expression engine to catastrophically backtrack causing the process to use 100% CPU time and blocking any other interactions. This allows an attacker to send a single request with an invalid header and take the service offline. This issue was introduced in version 1.4.2 when the regular expression was updated to attempt to match the behaviour required by errata associated with RFC7230. The regular expression that is used to validate incoming headers has been updated in version 1.4.3, it is recommended that people upgrade to the new version of Waitress as soon as possible.
References
Link | Resource |
---|---|
https://github.com/Pylons/waitress/commit/6e46f9e3f014d64dd7d1e258eaf626e39870ee1f | Patch Third Party Advisory |
https://github.com/Pylons/waitress/security/advisories/GHSA-73m2-3pwg-5fgc | Third Party Advisory |
History
No history.
MITRE Information
Status: PUBLISHED
Assigner: GitHub_M
Published: 2020-02-04T03:05:14
Updated: 2020-02-04T03:05:14
Reserved: 2020-01-02T00:00:00
Link: CVE-2020-5236
JSON object: View
NVD Information
Status : Analyzed
Published: 2020-02-04T03:15:10.750
Modified: 2020-02-06T18:46:27.267
Link: CVE-2020-5236
JSON object: View
Redhat Information
No data.
CWE