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pylons/waitress · Security

HTTP Request Smuggling in Waitress: Invalid whitespace characters in headers (Follow-up)

GHSA ID
GHSA-968f-66r5-5v74
CVE ID
CVE-2019-16789
Severity
medium
Published
Updated
CVSS
7.1 · CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:H/A:N
CVSS v3
7.1 · CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:H/A:N
CVSS v4
5.1 · CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:N/SC:L/SI:H/SA:N

Description

Impact

The patches introduced to fix https://github.com/Pylons/waitress/security/advisories/GHSA-m5ff-3wj3-8ph4 were not complete and still would allow an attacker to smuggle requests/split a HTTP request with invalid data.

This updates the existing CVE with ID: CVE-2019-16789

Patches

Waitress version 1.4.2 has been updated to now validate HTTP headers better to avoid the issue, completely fixing all known issues with whitespace.

Workarounds

There are no work-arounds, upgrading to Waitress 1.4.2 is highly recommended.

References

See https://github.com/Pylons/waitress/security/advisories/GHSA-m5ff-3wj3-8ph4 for more information on the security issue.

For more information

If you have any questions or comments about this advisory:

CWEs

  • CWE-444 · Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')

References

Open GitHub