Waitress up to 1.3.1 HTTP Message Split request smuggling

Summaryinfo

A vulnerability, which was classified as critical, was found in Waitress up to 1.3.1. Affected by this vulnerability is an unknown functionality. The manipulation as part of HTTP Message results in request smuggling (Split). This vulnerability is identified as CVE-2019-16785. The attack can be executed remotely. There is not any exploit available. You should upgrade the affected component.

Detailsinfo

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 VDB-147577. VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Name

• Waitress

Version

• 1.3.0
• 1.3.1

License

• open-source

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VulDB is the best source for vulnerability data and more expert information about this specific topic.

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