CVE-2019-17569

2020-02-2400:00:00

ubuntu.com

apache tomcat

http request smuggling

cve-2019-17569

refactoring

regression

transfer-encoding

reverse proxy

unix

CVSS2

5.8

Attack Vector

NETWORK

Attack Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

PARTIAL

Availability Impact

NONE

AV:N/AC:M/Au:N/C:P/I:P/A:N

CVSS3

4.8

Attack Vector

NETWORK

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

LOW

Integrity Impact

LOW

Availability Impact

NONE

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

EPSS

0.003

Percentile

71.6%

JSON

The refactoring present in Apache Tomcat 9.0.28 to 9.0.30, 8.5.48 to 8.5.50
and 7.0.98 to 7.0.99 introduced a regression. The result of the regression
was that invalid Transfer-Encoding headers were incorrectly processed
leading to a possibility of HTTP Request Smuggling if Tomcat was located
behind a reverse proxy that incorrectly handled the invalid
Transfer-Encoding header in a particular manner. Such a reverse proxy is
considered unlikely.