cve-2020-5236
Vulnerability from cvelistv5
Published
2020-02-04 03:05
Modified
2024-08-04 08:22
Severity ?
5.7 (Medium) - CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H
Summary
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
security-advisories@github.comhttps://github.com/Pylons/waitress/commit/6e46f9e3f014d64dd7d1e258eaf626e39870ee1fPatch, Third Party Advisory
security-advisories@github.comhttps://github.com/Pylons/waitress/security/advisories/GHSA-73m2-3pwg-5fgcThird Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://github.com/Pylons/waitress/commit/6e46f9e3f014d64dd7d1e258eaf626e39870ee1fPatch, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://github.com/Pylons/waitress/security/advisories/GHSA-73m2-3pwg-5fgcThird Party Advisory
Impacted products
Vendor Product Version
Show details on NVD website

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