CVE-2020-5236 Detail
Current Description
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.
Source:
MITRE
View Analysis Description
Analysis Description
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.
Source:
MITRE
Severity
CVSS 3.x Severity and Metrics:
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H
CVSS 2.0 Severity and Metrics:
Vector: (AV:N/AC:L/Au:S/C:N/I:N/A:C)
References to Advisories, Solutions, and Tools
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Weakness Enumeration
| CWE-ID |
CWE Name |
Source |
| CWE-400 |
Uncontrolled Resource Consumption |
NIST
GitHub, Inc.
|
Change History
2 change records found
- show changes
Initial Analysis -
2/6/2020 1:46:27 PM
| Action |
Type |
Old Value |
New Value |
| Added |
CPE Configuration |
|
OR
*cpe:2.3:a:agendaless:waitress:1.4.2:*:*:*:*:*:*:* |
| Added |
CVSS V2 |
|
NIST (AV:N/AC:L/Au:S/C:N/I:N/A:C) |
| Added |
CVSS V3.1 |
|
NIST AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
| Added |
CWE |
|
NIST CWE-400 |
| Changed |
Reference Type |
https://github.com/Pylons/waitress/commit/6e46f9e3f014d64dd7d1e258eaf626e39870ee1f No Types Assigned |
https://github.com/Pylons/waitress/commit/6e46f9e3f014d64dd7d1e258eaf626e39870ee1f Patch, Third Party Advisory |
| Changed |
Reference Type |
https://github.com/Pylons/waitress/security/advisories/GHSA-73m2-3pwg-5fgc No Types Assigned |
https://github.com/Pylons/waitress/security/advisories/GHSA-73m2-3pwg-5fgc Third Party Advisory |
CVE Modified by MITRE -
2/3/2020 11:15:10 PM
| Action |
Type |
Old Value |
New Value |
| Changed |
Description |
Record truncated, showing 500 of 783 characters.
View Entire Change Record
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 expressi |
Record truncated, showing 500 of 779 characters.
View Entire Change Record
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 |
Quick Info
CVE Dictionary Entry:
CVE-2020-5236
NVD Published Date:
02/03/2020
NVD Last Modified:
02/06/2020
|