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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2017.2643 Cisco NX-OS Software Python Parser Escape Vulnerability 19 October 2017 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Cisco NX-OS Operating System: Cisco Impact/Access: Execute Arbitrary Code/Commands -- Existing Account Resolution: Patch/Upgrade CVE Names: CVE-2017-12301 Original Bulletin: https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20171018-ppe - --------------------------BEGIN INCLUDED TEXT-------------------- Medium Advisory ID: cisco-sa-20171018-ppe First Published: 2017 October 18 16:00 GMT Version 1.0: Final Workarounds: No workarounds available Cisco Bug IDs: CSCvb86832 CSCvd86474 CSCvd86479 CSCvd86484 CSCvd86490 CSCve97102 CSCvf12757 CSCvf12804 CSCvf12815 CSCvf15198 CVE-2017-12301 CWE-20 CVSS Score: CVSS:3.0/AV:L/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:L/E:X/RL:X/RC:X CVE-2017-12301 CWE-20 Summary A vulnerability in the Python scripting subsystem of Cisco NX-OS Software could allow an authenticated, local attacker to escape the Python parser and gain unauthorized access to the underlying operating system of the device. The vulnerability exists due to insufficient sanitization of user- supplied parameters that are passed to certain Python functions within the scripting sandbox of the affected device. An attacker could exploit this vulnerability to escape the scripting sandbox and execute arbitrary commands on the underlying operating system with the privileges of the authenticated user. To exploit this vulnerability, an attacker must have local access and be authenticated to the targeted device with administrative or Python execution privileges. These requirements could limit the possibility of a successful exploit. There are no workarounds that address this vulnerability. This advisory is available at the following link: https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/ cisco-sa-20171018-ppe Affected Products Vulnerable Products This vulnerability affects the following Cisco products if they are running Cisco NX-OS Software: Multilayer Director Switches Nexus 2000 Series Fabric Extenders Nexus 3000 Series Switches Nexus 3500 Platform Switches Nexus 5000 Series Switches Nexus 5500 Platform Switches Nexus 5600 Platform Switches Nexus 6000 Series Switches Nexus 7000 Series Switches Nexus 7700 Series Switches Nexus 9000 Series Switches - Standalone, NX-OS mode Nexus 9500 R-Series Line Cards and Fabric Modules For information about affected software releases, consult the Cisco bug ID(s) at the top of this advisory. Products Confirmed Not Vulnerable No other Cisco products are currently known to be affected by this vulnerability. Cisco has confirmed that this vulnerability does not affect the following Cisco products: Firepower 2100 Series Firepower 4100 Series Next-Generation Firewall Firepower 9300 Security Appliance Nexus 1000V Series Switches Nexus 9000 Series Fabric Switches - ACI mode Unified Computing System Manager No other Cisco products are currently known to be affected by this vulnerability. Workarounds There are no workarounds that address this vulnerability. However, an administrator can reduce exposure to this vulnerability by ensuring that only highly trusted users are allowed access to the Python sandbox. Fixed Software For information about fixed software releases, consult the Cisco bug ID(s) at the top of this advisory. When considering software upgrades, customers are advised to regularly consult the advisories for Cisco products, which are available from the Cisco Security Advisories and Alerts page, to determine exposure and a complete upgrade solution. In all cases, customers should ensure that the devices to be upgraded contain sufficient memory and confirm that current hardware and software configurations will continue to be supported properly by the new release. If the information is not clear, customers are advised to contact the Cisco Technical Assistance Center (TAC) or their contracted maintenance providers. The following table lists the affected products and the associated Cisco bug ID(s): +------------------------------------+-------------------------------------+ | Affected Products | Cisco bug ID | +------------------------------------+-------------------------------------+ | Nexus 3000 Series Switches | CSCve97102 | +------------------------------------+-------------------------------------+ | Nexus 3500 Platform Switches | CSCvf12757, CSCvf12804 | +------------------------------------+-------------------------------------+ | Nexus 2000 Series Fabric Extenders | | | Nexus 5000 Series Switches | | | Nexus 5500 Platform Switches | CSCvf12815, CSCvf15198 | | Nexus 5600 Platform Switches | | | Nexus 6000 Series Switches | | +------------------------------------+-------------------------------------+ | Nexus 7000 Series Switches | CSCvb86832, CSCvd86474, CSCvd86484, | | Nexus 7700 Series Switches | CSCvd86479, CSCvd86490 | | Multilayer Director Switches | | +------------------------------------+-------------------------------------+ | Cisco Nexus 9000 Series Switches - | CSCve97102 | | Standalone, NX-OS mode | | +------------------------------------+-------------------------------------+ | Cisco Nexus 9500 R-Series Line | CSCve97102 | | Cards and Fabric Modules | | +------------------------------------+-------------------------------------+ Exploitation and Public Announcements The Cisco Product Security Incident Response Team (PSIRT) is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory. Source Cisco would like to thank network engineer Cody Winkler for finding and reporting this vulnerability. Revision History +----------+---------------------------+----------+--------+------------------+ | Version | Description | Section | Status | Date | +----------+---------------------------+----------+--------+------------------+ | 1.0 | Initial public release. | -- | Final | 2017-October-18 | +----------+---------------------------+----------+--------+------------------+ Legal Disclaimer THIS DOCUMENT IS PROVIDED ON AN "AS IS" BASIS AND DOES NOT IMPLY ANY KIND OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. YOUR USE OF THE INFORMATION ON THE DOCUMENT OR MATERIALS LINKED FROM THE DOCUMENT IS AT YOUR OWN RISK. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE THIS DOCUMENT AT ANY TIME. A standalone copy or paraphrase of the text of this document that omits the distribution URL is an uncontrolled copy and may lack important information or contain factual errors. The information in this document is intended for end users of Cisco products. - --------------------------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. 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On call after hours for member emergencies only. =========================================================================== -----BEGIN PGP SIGNATURE----- Comment: http://www.auscert.org.au/render.html?it=1967 iQIVAwUBWegec4x+lLeg9Ub1AQgTGA//eJoSMfBTXKzdSpQFjOgpkxAGSUHqTmnK pFd8BdilNS4ktFskPyxRKAHplHeasKAdnsdSDNzZXUDmLNEsnE3UECCQD9/xyRfN ab1CWIZG/XZToPFwMpqnCMUO588LOO8bLOYde4gnSUM6ScKVDBP8mkhidtMU9KU6 bYDW+brxLQqueXwNSaH3puH/yD2boOXeI6YNjfM7jFi8TjUKSw1XDpG85eKEmjLd FEw+n9I0I0Kn7+wiJPGLj8EEMd4m1jc0an/7QyU+nuu4/n6bMCsD0RC7cWHs0wWh 7+sbluVBuVXGC1UCELHs1u59BjZmaVmOPBiaRvBSWadBTgScK8otABnLwAcLmHHi j30HyevHLmry1fFMPsEY0e6gZqzEOMR+cZqYal9K9gUTjUTaR+6y3tACOrfoA4mL djIX7rBSKBwEH7kCdt0Uyc7T1hM3J3xdMSNPhoOUnFKsX6itl0EOsyWlWuALUtGm 50uOfzpqDr7Z6x39Dde7Y4WDUxFlac98ao7flsuglPPaX4eEEQVCegUpr+3MGhRS IvbHHQLuHy6SIgUMANsvxB6qBlsJ0Buunw5fPFttyKB1u4XSz1LWsDk2rKUUT7tJ i6YI5pf3PWqGHY+DNpkwmYcM2F/M4m9OzKSyAujObXYzhTAZbBt/8xdZu+crZAfo xPPuTg6UQvM= =xiDG -----END PGP SIGNATURE-----