There are packages installed that are affected by a vulnerability referenced in the following CVE:

  - websocket-extensions ruby module prior to 0.1.5 allows Denial of Service (DoS) via Regex Backtracking. The
    extension parser may take quadratic time when parsing a header containing an unclosed string parameter
    value whose content is a repeating two-byte sequence of a backslash and some other character. This could
    be abused by an attacker to conduct Regex Denial Of Service (ReDoS) on a single-threaded server by
    providing a malicious payload with the Sec-WebSocket-Extensions header. (CVE-2020-7663)

The remote Ubuntu 16.04 LTS / 18.04 LTS / 20.04 LTS host has a package installed that is affected by a vulnerability as referenced in the USN-4502-1 advisory.

    It was discovered that websocket-extensions does not properly parse

    special headers. A remote attacker could use this issue to cause regex

    backtracking, resulting in a denial of service. (CVE-2020-7663)

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the UTSA-2026-016659 advisory.

    websocket-extensions ruby module prior to 0.1.5 allows Denial of Service (DoS) via Regex Backtracking. The     extension parser may take quadratic time when parsing a header containing an unclosed string parameter     value whose content is a repeating two-byte sequence of a backslash and some other character. This could     be abused by an attacker to conduct Regex Denial Of Service (ReDoS) on a single-threaded server by     providing a malicious payload with the Sec-WebSocket-Extensions header.

Tenable has extracted the preceding description block directly from the Unity Linux security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Changelog :

Remove a ReDoS vulnerability in the header parser (CVE-2020-7663)

It was discovered that there was a denial of service vulnerability in ruby-websocket-extensions, a library for managing long-lived HTTP 'WebSocket' connections.

The parser took quadratic time when parsing a header containing an unclosed string parameter value whose content is a repeating two-byte sequence. This could be abused by an attacker to conduct a Regex Denial Of Service (ReDoS) on a single-threaded server by providing a malicious payload in the Sec-WebSocket-Extensions HTTP header.

For Debian 9 'Stretch', this problem has been fixed in version 0.1.2-1+deb9u1.

We recommend that you upgrade your ruby-websocket-extensions packages.

For the detailed security status of ruby-websocket-extensions please refer to its security tracker page at:
https://security-tracker.debian.org/tracker/ruby-websocket-extensions

NOTE: Tenable Network Security has extracted the preceding description block directly from the DLA security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

The remote Redhat Enterprise Linux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2020:4366 advisory.

    Red Hat Satellite is a systems management tool for Linux-based     infrastructure. It allows for provisioning, remote management, and     monitoring of multiple Linux deployments with a single centralized tool.

    Security Fix(es):

    * mysql-connector-java: Connector/J unspecified vulnerability (CPU October 2018) (CVE-2018-3258)
    * netty: HTTP Request Smuggling due to Transfer-Encoding whitespace mishandling (CVE-2020-7238)
    * rubygem-websocket-extensions: ReDoS vulnerability in Sec-WebSocket-Extensions parser (CVE-2020-7663)
    * puppet: puppet server and puppetDB may leak sensitive information via metrics API (CVE-2020-7943)
    * jackson-databind: multiple serialization gadgets (CVE-2020-8840 CVE-2020-9546 CVE-2020-9547     CVE-2020-9548 CVE-2020-10968 CVE-2020-10969 CVE-2020-11619 CVE-2020-14061 CVE-2020-14062 CVE-2020-14195)
    * foreman: unauthorized cache read on RPM-based installations through local user (CVE-2020-14334)
    * Satellite: Local user impersonation by Single sign-on (SSO) user leads to account takeover     (CVE-2020-14380)
    * Django: Incorrect HTTP detection with reverse-proxy connecting via HTTPS (CVE-2019-12781)
    * rubygem-rack: hijack sessions by using timing attacks targeting the session id (CVE-2019-16782)
    * rubygem-secure_headers: limited header injection when using dynamic overrides with user input     (CVE-2020-5216)
    * rubygem-secure_headers: directive injection when using dynamic overrides with user input (CVE-2020-5217)
    * rubygem-actionview: views that use the `j` or `escape_javascript` methods are susceptible to XSS attacks     (CVE-2020-5267)
    * puppet: Arbitrary catalog retrieval (CVE-2020-7942)
    * rubygem-rack: directory traversal in Rack::Directory (CVE-2020-8161)
    * rubygem-rack: percent-encoded cookies can be used to overwrite existing prefixed cookie names     (CVE-2020-8184)
    * hibernate-validator: Improper input validation in the interpolation of constraint error messages     (CVE-2020-10693)
    * puppet-agent: Puppet Agent does not properly verify SSL connection when downloading a CRL     (CVE-2018-11751)

    For more details about the security issue(s), including the impact, a CVSS     score, acknowledgments, and other related information, refer to the CVE     page(s) listed in the References section.

    Additional Changes:

    * Provides the Satellite Ansible Modules that allow for full automation of your Satellite configuration     and deployment.

    * Adds ability to install Satellite and Capsules and manage hosts in a IPv6 network environment

    * Ansible based Capsule Upgrade automation: Ability to centrally upgrade all of your Capsule servers with     a single job execution.

    * Platform upgrades to Postgres 12, Ansible 2.9, Ruby on Rails and latest version of Puppet

    * Support for HTTP UEFI provisioning

    * Support for CAC card authentication with Keycloak integration

    * Add ability to upgrade Red Hat Enterprise Linux 7 hosts to version 8 using the LEAPP based tooling.

    * Support for Red Hat Enterprise Linux Traces integration

    * satellite-maintain & foreman-maintain are now self updating

    * Notifications in the UI to warn users when subscriptions are expiring.

    The items above are not a complete list of changes. This update also fixes     several bugs and adds various enhancements. Documentation for these changes     is available from the Release Notes document linked to in the References     section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote SUSE Linux SLES15 / openSUSE 15 host has packages installed that are affected by a vulnerability as referenced in the SUSE-SU-2023:0127-1 advisory.

    - CVE-2020-7663: Fixed an excessive resource consumption when parsing       crafted message headers sent by an attacker (bsc#1172445).

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

ID	Name	Product	Family	Published	Updated	Severity
414944	SCA: security update for websocket-extensions (GHSA-g6wq-qcwm-j5g2)	Tenable Cloud Security	SCA Checks	1/23/2025	7/2/2026	high
414944	SCA: security update for websocket-extensions (GHSA-g6wq-qcwm-j5g2)	Tenable Self-Hosted Container Security	SCA Checks	1/23/2025	7/2/2026	high
140647	Ubuntu 16.04 LTS / 18.04 LTS / 20.04 LTS : websocket-extensions vulnerability (USN-4502-1)	Nessus	Ubuntu Local Security Checks	9/17/2020	8/27/2024	high
316228	Unity Linux 20.1060e / 20.1070e Security Update: rubygem-websocket-extensions (UTSA-2026-016659)	Nessus	Unity Linux Local Security Checks	5/22/2026	5/22/2026	high
137127	FreeBSD : websocket-extensions -- ReDoS vulnerability (ca8327f7-a5a5-11ea-a860-08002728f74c)	Nessus	FreeBSD Local Security Checks	6/4/2020	3/7/2024	high
139703	Debian DLA-2334-1 : ruby-websocket-extensions security update	Nessus	Debian Local Security Checks	8/20/2020	2/23/2024	high
142452	RHEL 7 : Satellite 6.8 (Important) (RHSA-2020:4366)	Nessus	Red Hat Local Security Checks	11/4/2020	11/7/2024	critical
170607	SUSE SLES15: ruby2.5-rubygem-websocket-extensions / etc (SUSE-SU-2023:0127-1)	Nessus	SuSE Local Security Checks	1/25/2023	6/26/2026	high

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