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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2021.2210.2 Python Flask vulnerability CVE-2018-1000656 14 September 2021 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: BIG-IQ F5OS Publisher: F5 Networks Operating System: Network Appliance Impact/Access: Denial of Service -- Remote/Unauthenticated Resolution: Mitigation CVE Names: CVE-2018-1000656 Reference: ESB-2020.1908 ESB-2020.0955 ESB-2019.3184 Original Bulletin: https://support.f5.com/csp/article/K63597327 Revision History: September 14 2021: Vendor updated versions known to be vulnerable June 23 2021: Initial Release - --------------------------BEGIN INCLUDED TEXT-------------------- K63597327: Python Flask vulnerability CVE-2018-1000656 Original Publication Date: 23 Jun, 2021 Latest Publication Date: 13 Sep, 2021 Security Advisory Description The Pallets Project flask version Before 0.12.3 contains a CWE-20: Improper Input Validation vulnerability in flask that can result in Large amount of memory usage possibly leading to denial of service. This attack appear to be exploitable via Attacker provides JSON data in incorrect encoding. This vulnerability appears to have been fixed in 0.12.3. NOTE: this may overlap CVE-2019-1010083. (CVE-2018-1000656) Impact An attacker may use crafted JSON data to cause a denial-of-service (DoS) attack. BIG-IQ Centralized Management Only the control plane for the BIG-IQ Configuration utility uses the Python Flask module. F5OS Only the web server for the front panel LCD touchscreen uses Flask. They system uses the LCD web server only when you access the front panel touchscreen. No other component interacts with Flask. Security Advisory Status F5 Product Development has assigned ID 1025037 (BIG-IQ) and ID 1025305 (F5OS) to this vulnerability. To determine if your product and version have been evaluated for this vulnerability, refer to the Applies to (see versions) box. To determine if your release is known to be vulnerable, the components or features that are affected by the vulnerability, and for information about releases, point releases, or hotfixes that address the vulnerability, refer to the following table. For more information about security advisory versioning, refer to K51812227: Understanding security advisory versioning. Note: After a fix is introduced for a given minor branch, that fix applies to all subsequent maintenance and point releases for that branch, and no additional fixes for that branch will be listed in the table. For example, when a fix is introduced in 14.1.2.3, the fix also applies to 14.1.2.4, and all later 14.1.x releases (14.1.3.x., 14.1.4.x). For more information, refer to K51812227: Understanding security advisory versioning. Additionally, software versions preceding those listed in the following table have reached the End of Technical Support (EoTS) phase of their lifecycle and are no longer evaluated for security issues. For more information, refer to the Security hotfixes section of K4602: Overview of the F5 security vulnerability response policy. +------------+------+--------------+----------+----------+------+-------------+ | | |Versions known|Fixes | |CVSSv3|Vulnerable | |Product |Branch|to be |introduced|Severity |score^|component or | | | |vulnerable^1 |in | |2 |feature | +------------+------+--------------+----------+----------+------+-------------+ | |16.x |None |Not | | | | | | | |applicable| | | | | +------+--------------+----------+ | | | | |15.x |None |Not | | | | | | | |applicable| | | | | +------+--------------+----------+ | | | | |14.x |None |Not | | | | |BIG-IP (all | | |applicable|Not | | | |modules) +------+--------------+----------+vulnerable|None |None | | |13.x |None |Not | | | | | | | |applicable| | | | | +------+--------------+----------+ | | | | |12.x |None |Not | | | | | | | |applicable| | | | | +------+--------------+----------+ | | | | |11.x |None |Not | | | | | | | |applicable| | | | +------------+------+--------------+----------+----------+------+-------------+ | |8.x |8.0.0 |None | | | | |BIG-IQ +------+--------------+----------+ | |Configuration| |Centralized |7.x |7.0.0 - 7.1.0 |None |High |7.5 |utility | |Management +------+--------------+----------+ | | | | |6.x |6.0.1 - 6.1.0 |None | | | | +------------+------+--------------+----------+----------+------+-------------+ |F5OS |1.x |1.1.0 - 1.1.4 |None |High |7.5 |LCD web | | | | | | | |server | +------------+------+--------------+----------+----------+------+-------------+ |Traffix SDC |5.x |None |Not |Not |None |None | | | | |applicable|vulnerable| | | +------------+------+--------------+----------+----------+------+-------------+ ^1F5 evaluates only software versions that have not yet reached the End of Technical Support (EoTS) phase of their lifecycle. ^2The CVSSv3 score link takes you to a resource outside of AskF5, and it is possible that the document may be removed without our knowledge. Recommended Actions If you are running a version listed in the Versions known to be vulnerable column, you can eliminate this vulnerability by installing a version listed in the Fixes introduced in column. If the Fixes introduced in column does not list a version for your branch, then no update candidate currently exists for that branch and F5 recommends upgrading to a version with the fix (refer to the table). If the Fixes introduced in column lists a version prior to the one you are running, in the same branch, then your version should have the fix. Mitigation BIG-IQ Centralized Management To mitigate this vulnerability for the BIG-IQ system, permit management access only over a secure network, limit access to only trusted users, and limit network access only to designated source IP addresses. For more information about securing access to BIG-IQ systems, refer to K31401771: Restricting access to the BIG-IQ or F5 iWorkflow user interface by source IP address and K39403510: Managing the port lockdown configuration on the BIG-IQ system. F5OS To mitigate this vulnerability for F5OS, restrict physical access to the front panel LCD touchscreen to only trusted users. Supplemental Information o K41942608: Overview of security advisory articles o K4602: Overview of the F5 security vulnerability response policy o K4918: Overview of the F5 critical issue hotfix policy o K8986: F5 software lifecycle policy o K9502: BIG-IP hotfix and point release matrix o K13123: Managing BIG-IP product hotfixes (11.x - 16.x) o K15106: Managing BIG-IQ product hotfixes o K15113: BIG-IQ hotfix and point release matrix o K167: Downloading software and firmware from F5 o K9970: Subscribing to email notifications regarding F5 products o K9957: Creating a custom RSS feed to view new and updated documents - --------------------------END INCLUDED TEXT-------------------- You have received this e-mail bulletin as a result of your organisation's registration with AusCERT. The mailing list you are subscribed to is maintained within your organisation, so if you do not wish to continue receiving these bulletins you should contact your local IT manager. If you do not know who that is, please send an email to auscert@auscert.org.au and we will forward your request to the appropriate person. NOTE: Third Party Rights This security bulletin is provided as a service to AusCERT's members. As AusCERT did not write the document quoted above, AusCERT has had no control over its content. The decision to follow or act on information or advice contained in this security bulletin is the responsibility of each user or organisation, and should be considered in accordance with your organisation's site policies and procedures. AusCERT takes no responsibility for consequences which may arise from following or acting on information or advice contained in this security bulletin. NOTE: This is only the original release of the security bulletin. It may not be updated when updates to the original are made. If downloading at a later date, it is recommended that the bulletin is retrieved directly from the author's website to ensure that the information is still current. Contact information for the authors of the original document is included in the Security Bulletin above. If you have any questions or need further information, please contact them directly. Previous advisories and external security bulletins can be retrieved from: https://www.auscert.org.au/bulletins/ =========================================================================== Australian Computer Emergency Response Team The University of Queensland Brisbane Qld 4072 Internet Email: auscert@auscert.org.au Facsimile: (07) 3365 7031 Telephone: (07) 3365 4417 (International: +61 7 3365 4417) AusCERT personnel answer during Queensland business hours which are GMT+10:00 (AEST). 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