Waitress up to 1.3.1 HTTP Message Split request smuggling

CVSS Meta Temp Score
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CTI Interest Score
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6.2$0-$5k0.00

A vulnerability, which was classified as critical, was found in Waitress up to 1.3.1. Affected is some unknown functionality. The manipulation as part of a HTTP Message leads to a request smuggling vulnerability (Split). CWE is classifying the issue as CWE-444. The product acts as an intermediary HTTP agent (such as a proxy or firewall) in the data flow between two entities such as a client and server, but it does not interpret malformed HTTP requests or responses in ways that are consistent with how the messages will be processed by those entities that are at the ultimate destination. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

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.

The weakness was released 12/20/2019 (GitHub Repository). The advisory is shared for download at github.com. This vulnerability is traded as CVE-2019-16785 since 09/24/2019. The exploitability is told to be difficult. It is possible to launch the attack remotely. A authentication is required for exploitation. There are neither technical details nor an exploit publicly available.

Upgrading to version 1.4.0 eliminates this vulnerability.

Entry connected to this vulnerability is available at 147577.

Productinfo

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Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB CVSS-B Score: 🔍
VulDB CVSS-BT Score: 🔍
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.5
VulDB Meta Temp Score: 6.2

VulDB Base Score: 6.0
VulDB Temp Score: 5.3
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.1
NVD Vector: 🔍

CVSSv2info

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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Name: Split
Class: Request smuggling / Split
CWE: CWE-444
ATT&CK: Unknown

Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Threat Intelligenceinfo

Interest: 🔍
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Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: Waitress 1.4.0
Patch: github.com

Timelineinfo

09/24/2019 🔍
12/20/2019 +87 days 🔍
12/21/2019 +1 days 🔍
03/16/2024 +1547 days 🔍

Sourcesinfo

Advisory: RHSA-2020:0720
Status: Not defined

CVE: CVE-2019-16785 (🔍)
See also: 🔍

Entryinfo

Created: 12/21/2019 17:55
Updated: 03/16/2024 09:50
Changes: 12/21/2019 17:55 (41), 12/21/2019 18:00 (11), 03/16/2024 09:50 (4)
Complete: 🔍

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