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[email protected]CVE-2020-5236

HistoryFeb 04, 2020 - 3:15 a.m.

CVE-2020-5236

2020-02-0403:15:10

CWE-400

[email protected]

web.nvd.nist.gov

waitress

cve-2020-5236

dos attack

security vulnerability

regular expression

rfc7230

nvd

invalid header

6.8 Medium

CVSS2

Attack Vector

NETWORK

Attack Complexity

LOW

Authentication

SINGLE

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

COMPLETE

AV:N/AC:L/Au:S/C:N/I:N/A:C

6.5 Medium

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

HIGH

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

6.2 Medium

AI Score

Confidence

High

0.001 Low

EPSS

Percentile

33.0%

JSON

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.

Affected configurations

Vulners

NVD

Node

pylonswaitressMatch1.4.2

CPENameOperatorVersion
agendaless:waitressagendaless waitresseq1.4.2

CPE	Name	Operator	Version
agendaless:waitress	agendaless waitress	eq	1.4.2

CNA Affected

[
  {
    "product": "Waitress",
    "vendor": "Pylons",
    "versions": [
      {
        "status": "affected",
        "version": "= 1.4.2"
      }
    ]
  }
]