Описание
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.
A flaw was found in the regex used to process HTTP Headers in python-waitress and is vulnerable to catastrophic backtracking. This flaw allows an attacker with the ability to send HTTP requests to a vulnerable server to cause a denial of service attack.
Отчет
- OpenShift Container Platform 4 uses an earlier version of python-waitress which is not affected by this vulnerability.
- Red Hat Quay uses an earlier version of python-waitress which is not affected by this vulnerability.
- Red Hat OpenStack Platform 15 and 16 ship but do not use the flawed version of python-waitress. The impact for these products is therefore rated as having a security impact of Low. (Earlier versions of RHOSP do not ship the flawed code.)
- This issue did not affect Red Hat Ceph Storage 3 and 4 as the vulnerable code is not present in the shipped version of python-waitress.
Затронутые пакеты
| Платформа | Пакет | Состояние | Рекомендация | Релиз |
|---|---|---|---|---|
| Red Hat Ceph Storage 3 | python-waitress | Not affected | ||
| Red Hat Ceph Storage 4 | python-waitress | Not affected | ||
| Red Hat OpenShift Container Platform 4 | python-waitress | Not affected | ||
| Red Hat OpenStack Platform 13 (Queens) | python-waitress | Not affected | ||
| Red Hat OpenStack Platform 15 (Stein) | python-waitress | Out of support scope | ||
| Red Hat OpenStack Platform 16 (Train) | python-waitress | Fix deferred | ||
| Red Hat Quay 3 | python-waitress | Not affected |
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Дополнительная информация
Статус:
EPSS
6.5 Medium
CVSS3
Связанные уязвимости
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.
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.
Waitress version 1.4.2 allows a DOS attack When waitress receives a he ...
Catastrophic backtracking in regex allows Denial of Service in Waitress
EPSS
6.5 Medium
CVSS3