Gunicorn fails to properly validate Transfer-Encoding headers, leading to HTTP Request Smuggling (HRS) vulnerabilities. By crafting requests with conflicting Transfer-Encoding headers, attackers can bypass security restrictions and access restricted endpoints. This issue is due to Gunicorn's handling of Transfer-Encoding headers, where it incorrectly processes requests with multiple, conflicting Transfer-Encoding headers, treating them as chunked regardless of the final encoding specified. This vulnerability allows for a range of attacks including cache poisoning, session manipulation, and data exposure.

The remote Redhat Enterprise Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2025:1335 advisory.

    Red Hat Update Infrastructure (RHUI) provides a highly scalable and redundant framework for managing     repositories and content. It also allows cloud providers to deliver content and updates to Red Hat     Enterprise Linux (RHEL) instances.

    Security Fixes:
    * Cryptography: NULL pointer dereference with pkcs12.serialize_key_and_certificates when called with a     non-matching certificate and private key and an hmac_hash override (CVE-2024-26130)

    * Gunicorn: HTTP Request Smuggling due to improper validation of Transfer-Encoding headers (CVE-2024-1135)

    * Aiohttp: aiohttp: XSS on index pages for static file handling (CVE-2024-27306)

    * Aiohttp: aiohttp: DoS when trying to parse malformed POST requests (CVE-2024-30251)

    * Sqlparse: sqlparse: parsing heavily nested list leads to denial of service (CVE-2024-4340)

    * Jinja2: jinja2: accepts keys containing non-attribute characters (CVE-2024-34064)

    * Django: Potential denial-of-service in django.utils.translation.get_supported_language_variant()     (CVE-2024-39614)

    * Django: Memory exhaustion in django.utils.numberformat.floatformat() (CVE-2024-41989)

    * Django: Potential SQL injection in QuerySet.values() and values_list() (CVE-2024-42005)

    * Django: Potential denial-of-service vulnerability in django.utils.html.urlize() (CVE-2024-41990)

    * Django: Potential denial-of-service vulnerability in django.utils.html.urlize() and AdminURLFieldWidget     (CVE-2024-41991)

    * Grpcio: client communicating with a HTTP/2 proxy can poison the HPACK table between the proxy and the     backend (CVE-2024-7246)

    * Requests: subsequent requests to the same host ignore cert verification (CVE-2024-35195)

    For detailed information on other changes in this release, see the Red Hat Update Infrastructure Release     Notes linked from 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 version of Oracle Business Intelligence Enterprise Edition (OAS) 7.0.0.0 installed on the remote host is affected by multiple vulnerabilities as referenced in the January 2025 CPU advisory, including the following:

  - Vulnerability in the Oracle Business Intelligence Enterprise Edition product of Oracle Analytics     (component: Analytics Server (SciPy)). Supported versions that are affected are 7.0.0.0.0 and 7.6.0.0.0.     Easily exploitable vulnerability allows unauthenticated attacker with network access via HTTP to     compromise Oracle Business Intelligence Enterprise Edition. Successful attacks of this vulnerability can     result in takeover of Oracle Business Intelligence Enterprise Edition. (CVE-2023-29824)

  - Vulnerability in the Oracle Business Intelligence Enterprise Edition product of Oracle Analytics     (component: Platform Security (OpenSSL)). Supported versions that are affected are 7.0.0.0.0, 7.6.0.0.0     and 12.2.1.4.0. Easily exploitable vulnerability allows unauthenticated attacker with network access via     TLS to compromise Oracle Business Intelligence Enterprise Edition. Successful attacks of this     vulnerability can result in unauthorized access to critical data or complete access to all Oracle Business     Intelligence Enterprise Edition accessible data and unauthorized ability to cause a hang or frequently     repeatable crash (complete DOS) of Oracle Business Intelligence Enterprise Edition. (CVE-2024-5535)

  - Vulnerability in the Oracle Business Intelligence Enterprise Edition product of Oracle Analytics     (component: Analytics Server, Pipeline Test Failures, Installation (Spring Framework)). Supported versions     that are affected are 7.0.0.0.0, 7.6.0.0.0 and 12.2.1.4.0. Easily exploitable vulnerability allows     unauthenticated attacker with network access via HTTP to compromise Oracle Business Intelligence     Enterprise Edition. Successful attacks of this vulnerability can result in unauthorized ability to cause     a partial denial of service (partial DOS) of Oracle Business Intelligence Enterprise Edition.     (CVE-2024-38809)

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

The remote Debian 11 host has packages installed that are affected by a vulnerability as referenced in the dla-3996 advisory.

    - -------------------------------------------------------------------------     Debian LTS Advisory DLA-3996-1                debian-lts@lists.debian.org     https://www.debian.org/lts/security/                          Adrian Bunk     December 20, 2024                             https://wiki.debian.org/LTS
    - -------------------------------------------------------------------------

    Package        : gunicorn     Version        : 20.1.0-1+deb11u1     CVE ID         : CVE-2024-1135     Debian Bug     : 1069126

    HTTP Request Smuggling has been fixed in the Python WSGI HTTP Server Gunicorn.

    For Debian 11 bullseye, this problem has been fixed in version     20.1.0-1+deb11u1.

    We recommend that you upgrade your gunicorn packages.

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

    Further information about Debian LTS security advisories, how to apply     these updates to your system and frequently asked questions can be     found at: https://wiki.debian.org/LTS

Tenable has extracted the preceding description block directly from the Debian 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 remote Redhat Enterprise Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2024:7987 advisory.

    Red Hat Satellite is a system management solution that allows organizations     to configure and maintain their systems without the necessity to provide     public Internet access to their servers or other client systems. It     performs provisioning and configuration management of predefined standard     operating environments.
    Security Fix(es):

    * python-gunicorn: HTTP Request Smuggling due to improper validation of Transfer-Encoding headers     (CVE-2024-1135)
    * golang: net/netip: Unexpected behavior from Is methods for IPv4-mapped IPv6 addresses (CVE-2024-24790)
    * python-cryptography: NULL pointer dereference with pkcs12.serialize_key_and_certificates when called     with a non-matching certificate and private key and an hmac_hash override (CVE-2024-26130)
    * python-django: Potential denial-of-service vulnerability in django.utils.html.urlize() and     AdminURLFieldWidget (CVE-2024-41991)

    Users of Red Hat Satellite are advised to upgrade to these updated     packages, which fix these bugs.

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 / SLES_SAP15 / openSUSE 15 host has packages installed that are affected by a vulnerability as referenced in the SUSE-SU-2024:2881-1 advisory.

    - CVE-2024-1135: Fixed HTTP Request Smuggling due to improperly validate Transfer-Encoding headers     (bsc#1222950)

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.

The remote Debian 10 host has packages installed that are affected by a vulnerability as referenced in the dla-3851 advisory.

    -------------------------------------------------------------------------     Debian LTS Advisory DLA-3851-1                debian-lts@lists.debian.org     https://www.debian.org/lts/security/                      Markus Koschany     June 30, 2024                                 https://wiki.debian.org/LTS
    -------------------------------------------------------------------------

    Package        : gunicorn     Version        : 19.9.0-1+deb10u1     CVE ID         : CVE-2024-1135     Debian Bug     : 1069126

    Gunicorn, an event-based HTTP/WSGI server, fails to properly validate Transfer-     Encoding headers, leading to HTTP Request Smuggling (HRS) vulnerabilities. By     crafting requests with conflicting Transfer-Encoding headers, attackers can     bypass security restrictions and access restricted endpoints. This issue is due     to Gunicorns handling of Transfer-Encoding headers, where it incorrectly     processes requests with multiple, conflicting Transfer-Encoding headers,     treating them as chunked regardless of the final encoding specified. This     vulnerability allows for a range of attacks including cache poisoning, session     manipulation, and data exposure.

    For Debian 10 buster, this problem has been fixed in version     19.9.0-1+deb10u1.

    We recommend that you upgrade your gunicorn packages.

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

    Further information about Debian LTS security advisories, how to apply     these updates to your system and frequently asked questions can be     found at: https://wiki.debian.org/LTS     Attachment:
    signature.asc     Description: This is a digitally signed message part

Tenable has extracted the preceding description block directly from the Debian 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 remote Redhat Enterprise Linux 8 host has a package installed that is affected by a vulnerability as referenced in the RHSA-2024:4054 advisory.

    Gunicorn (Green Unicorn) is a Python WSGI HTTP server for UNIX.

    Security Fix(es):

    * HTTP Request Smuggling due to improper validation of Transfer-Encoding     headers (CVE-2024-1135)

    For more details about the security issue(s), including the impact, a CVSS     score, acknowledgments, and other related information, refer to the CVE     page listed 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 this issue but has instead relied only on the application's self-reported version number.

The remote Redhat Enterprise Linux 8 / 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2024:3781 advisory.

    Red Hat Ansible Automation Platform provides an enterprise framework for building, deploying and managing     IT automation at scale. IT Managers can provide top-down guidelines on how automation is applied to     individual teams, while automation developers retain the freedom to write tasks that leverage existing     knowledge without the overhead. Ansible Automation Platform makes it possible for users across an     organization to share, vet, and manage automation content by means of a simple, powerful, and agentless     language.

    Security Fix(es):

    * automation-controller: aiohttp: DoS when trying to parse malformed POST requests (CVE-2024-30251)
    * automation-controller: Django: Potential regular expression denial-of-service in     django.utils.text.Truncator.words() (CVE-2024-27351)
    * automation-controller: pip: Mercurial configuration injectable in repo revision when installing via pip     (CVE-2023-5752)
    * automation-controller: pydantic: regular expression denial of service via crafted email string     (CVE-2024-3772)
    * automation-hub, python3/python39-galaxy-ng: follow-redirects: Possible credential leak (CVE-2024-28849)
    * python3/python39-aiohttp: DoS when trying to parse malformed POST requests (CVE-2024-30251)
    * python3/python39-aiohttp: XSS on index pages for static file handling (CVE-2024-27306)
    * python3/python39-black: ReDoS via the lines_with_leading_tabs_expanded() function in strings.py file     (CVE-2024-21503)
    * python3/python39-cryptography: NULL pointer dereference with pkcs12.serialize_key_and_certificates when     called with a non-matching certificate and private key and an hmac_hash override (CVE-2024-26130)
    * python3/python39-cryptography: NULL-dereference when loading PKCS7 certificates (CVE-2023-49083)
    * python3/python39-cryptography: NULL-dereference when loading PKCS7 certificates (CVE-2023-49083)
    * python3/python39-gunicorn: HTTP Request Smuggling due to improper validation of Transfer-Encoding     headers (CVE-2024-1135)
    * python3/python39-idna: potential DoS via resource consumption via specially crafted inputs to     idna.encode() (CVE-2024-3651)
    * python3/python39-jinja2: accepts keys containing non-attribute characters (CVE-2024-34064)
    * python3/python39-pillow: buffer overflow in _imagingcms.c (CVE-2024-28219)
    * python3/python39-pillow: Arbitrary Code Execution via the environment parameter (CVE-2023-50447)
    * python3/python39-pydantic: regular expression denial of service via crafted email string (CVE-2024-3772)
    * python3/python39-requests: subsequent requests to the same host ignore cert verification     (CVE-2024-35195)
    * python3/python39-social-auth-app-django: Improper Handling of Case Sensitivity in social-auth-app-django     (CVE-2024-32879)
    * python3/python39-sqlparse: parsing heavily nested list leads to denial of service (CVE-2024-4340)
    * receptor: golang: crypto/x509: Verify panics on certificates with an unknown public key algorithm     (CVE-2024-24783)
    * receptor: golang: net/http, x/net/http2: unlimited number of CONTINUATION frames causes DoS     (CVE-2023-45288)
    * receptor: golang: net/http: memory exhaustion in Request.ParseMultipartForm (CVE-2023-45290)

    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.

    Updates and fixes for automation controller:
    * Fixed Redis connection leak on version 4.5.6 (AAP-24286)
    * automation-controller has been updated to 4.5.7

    Updates and fixes for automation hub:
    * Fixed repository sync issues (AAH-3111, AAH-3218)
    * automation-hub/python3-galaxy-ng/python39-galaxy-ng have been updated to 4.9.2

    Additional changes:
    * ansible-core has been updated to 2.15.11
    * automation-eda-controller has been updated to 1.0.7
    * installer and setup have been updated to 2.4-7
    * receptor has been updated to 1.4.8

    For more details about the updates and fixes included in this release, refer to the Release Notes.

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 Redhat Enterprise Linux 9 host has a package installed that is affected by a vulnerability as referenced in the RHSA-2024:2727 advisory.

    Gunicorn (Green Unicorn) is a Python WSGI HTTP server for UNIX

    Security Fix(es):

    * HTTP Request Smuggling due to improper validation of Transfer-Encoding     headers (CVE-2024-1135)

    For more details about the security issue(s), including the impact, a CVSS     score, acknowledgments, and other related information, refer to the CVE     page listed 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 this issue but has instead relied only on the application's self-reported version number.

The remote SUSE Linux SLED15 / SLED_SAP15 / SLES15 / SLES_SAP15 / openSUSE 15 host has a package installed that is affected by a vulnerability as referenced in the SUSE-SU-2024:1440-1 advisory.

  - Gunicorn fails to properly validate Transfer-Encoding headers, leading to HTTP Request Smuggling (HRS)     vulnerabilities. By crafting requests with conflicting Transfer-Encoding headers, attackers can bypass     security restrictions and access restricted endpoints. This issue is due to Gunicorn's handling of     Transfer-Encoding headers, where it incorrectly processes requests with multiple, conflicting Transfer-     Encoding headers, treating them as chunked regardless of the final encoding specified. This vulnerability     allows for a range of attacks including cache poisoning, session manipulation, and data exposure.
    (CVE-2024-1135)

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	Severity
216436	RHEL 8 : RHUI 4.11 (RHSA-2025:1335)	Nessus	Red Hat Local Security Checks	high
214600	Oracle Business Intelligence Enterprise Edition (OAS 7.0) (January 2025 CPU)	Nessus	Misc.	critical
213273	Debian dla-3996 : gunicorn - security update	Nessus	Debian Local Security Checks	high
208713	RHEL 8 : Satellite 6.15.4 Security Update (Moderate) (RHSA-2024:7987)	Nessus	Red Hat Local Security Checks	critical
205395	SUSE SLES15 / openSUSE 15 Security Update : python-gunicorn (SUSE-SU-2024:2881-1)	Nessus	SuSE Local Security Checks	high
201172	Debian dla-3851 : gunicorn - security update	Nessus	Debian Local Security Checks	high
200873	RHEL 8 : Red Hat OpenStack Platform 16.2 (python-gunicorn) (RHSA-2024:4054)	Nessus	Red Hat Local Security Checks	high
200272	RHEL 8 / 9 : Red Hat Ansible Automation Platform 2.4 Product Security and Bug Fix Update (Moderate) (RHSA-2024:3781)	Nessus	Red Hat Local Security Checks	critical
197635	RHEL 9 : Red Hat OpenStack Platform 17.1 (python-gunicorn) (RHSA-2024:2727)	Nessus	Red Hat Local Security Checks	high
194461	SUSE SLED15 / SLES15 / openSUSE 15 Security Update : python-gunicorn (SUSE-SU-2024:1440-1)	Nessus	SuSE Local Security Checks	high

Detections

Analytics

CVE-2024-1135

medium

Tenable Plugins

high

critical

high

critical

high

high

high

critical

high

high