CVE-2019-16785 Vulnerability Details

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CVE-2019-16785 Metadata Quick Info

CVE Published: 20/12/2019 | CVE Updated: 05/08/2024 | CVE Year: 2019
Source: GitHub_M | Vendor: Pylons | Product: Waitress
Status : PUBLISHED

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CVE-2019-16785 Description

Waitress through version 1.3.1 implemented a "MAY" part of the RFC7230 which states: "Although the line terminator for the start-line and header fields is the sequence CRLF, a recipient MAY recognize a single LF as a line terminator and ignore any preceding CR." Unfortunately if a front-end server does not parse header fields with an LF the same way as it does those with a CRLF it can lead to the front-end and the back-end server parsing the same HTTP message in two different ways. This can lead to a potential for HTTP request smuggling/splitting whereby Waitress may see two requests while the front-end server only sees a single HTTP message. This issue is fixed in Waitress 1.4.0.

Metrics

CVSS Version: 3.1 | Base Score: 7.1 HIGH
Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:L/A:N

l➤ Exploitability Metrics:
    Attack Vector (AV)* NETWORK
    Attack Complexity (AC)* HIGH
    Privileges Required (PR)* LOW
    User Interaction (UI)* NONE
    Scope (S)* CHANGED

l➤ Impact Metrics:
    Confidentiality Impact (C)* HIGH
    Integrity Impact (I)* LOW
    Availability Impact (A)* NONE

Weakness Enumeration (CWE)

CWE-ID: CWE-444
CWE Name: CWE-444 Inconsistent Interpretation of HTTP Requests ( HTTP Request Smuggling )
Source: Pylons

Common Attack Pattern Enumeration and Classification (CAPEC)

CAPEC-ID:
CAPEC Description:


Source: NVD (National Vulnerability Database).