03 February 2023
Protect yourself against future threats.
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2023.0169.3 Cisco Network Services Orchestrator Path Traversal Vulnerability 3 February 2023 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Cisco Network Services Orchestrator (NSO) Publisher: Cisco Systems Operating System: Cisco Resolution: Patch/Upgrade CVE Names: CVE-2023-20040 Original Bulletin: https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-nso-path-trvsl-zjBeMkZg Comment: CVSS (Max): 5.5 CVE-2023-20040 (CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:H) CVSS Source: Cisco Systems Calculator: https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:H Revision History: February 3 2023: Formatting issue February 3 2023: Vendor confirmed products that are not vulnerable January 12 2023: Initial Release - --------------------------BEGIN INCLUDED TEXT-------------------- Cisco Network Services Orchestrator Path Traversal Vulnerability Priority: Medium Advisory ID: cisco-sa-nso-path-trvsl-zjBeMkZg First Published: 2023 January 11 16:00 GMT Last Updated: 2023 February 2 20:22 GMT Version 1.1: Final Workarounds: No workarounds available Cisco Bug IDs: CSCwb11065 CVE Names: CVE-2023-20040 Summary o A vulnerability in the RESTCONF service of Cisco Network Services Orchestrator (NSO) could allow an authenticated, remote attacker to cause a denial of service (DoS) on an affected system that is running as the root user. To exploit this vulnerability, the attacker must be a member of the admin group. This vulnerability exists because user-supplied input is not properly validated when RESTCONF is used to upload packages to an affected device. An attacker could exploit this vulnerability by uploading a specially crafted package file. A successful exploit could allow the attacker to write crafted files to arbitrary locations on the filesystem or delete arbitrary files from the filesystem of an affected device, resulting in a DoS condition. Note: By default, during install, Cisco NSO will be set up to run as the root user unless the --run-as-user option is used. Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability. This advisory is available at the following link: https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-nso-path-trvsl-zjBeMkZg Affected Products o Vulnerable Products At the time of publication, this vulnerability affected Cisco NSO. For information about which Cisco software releases were vulnerable at the time of publication, see the Fixed Software section of this advisory. See the Details section in the bug ID(s) at the top of this advisory for the most complete and current information. Products Confirmed Not Vulnerable Only products listed in the Vulnerable Products section of this advisory are known to be affected by this vulnerability. Cisco has confirmed that this vulnerability does not affect Cisco NSO installations that are not running RESTCONF. Workarounds o There are no workarounds that address this vulnerability. Fixed Software o When considering software upgrades , customers are advised to regularly consult the advisories for Cisco products, which are available from the Cisco Security Advisories 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. Fixed Releases At the time of publication, the release information in the following table was accurate. See the Details section in the bug ID(s) at the top of this advisory for the most complete and current information. The left column lists Cisco software releases, and the right column indicates whether a release was affected by the vulnerability that is described in this advisory and which release included the fix for this vulnerability. Cisco NSO Release First Fixed Release 3.3 through 5.3 Migrate to a fixed release. 5.4 5.4.7 5.5 5.5.6 5.6 5.6.7 5.7 5.7.4 5.8 5.8.1 6.0 Not vulnerable. The Cisco Product Security Incident Response Team (PSIRT) validates only the affected and fixed release information that is documented in this advisory. Exploitation and Public Announcements o The Cisco PSIRT is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory. Source o This vulnerability was found during internal security testing by Arthur Vidineyev of the Cisco Advanced Security Initiatives Group (ASIG). Cisco Security Vulnerability Policy o To learn about Cisco security vulnerability disclosure policies and publications, see the Security Vulnerability Policy . This document also contains instructions for obtaining fixed software and receiving security vulnerability information from Cisco. Subscribe to Cisco Security Notifications o Subscribe Related to This Advisory o URL o https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-nso-path-trvsl-zjBeMkZg Revision History o +---------+---------------+------------------------+--------+-------------+ | Version | Description | Section | Status | Date | +---------+---------------+------------------------+--------+-------------+ | | Changed | Summary and Products | | | | 1.1 | NETCONF to | Confirmed Not | Final | 2023-FEB-02 | | | RESTCONF. | Vulnerable | | | +---------+---------------+------------------------+--------+-------------+ | | Initial | | | | | 1.0 | public | - | Final | 2023-JAN-11 | | | release. | | | | +---------+---------------+------------------------+--------+-------------+ Legal Disclaimer o 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. 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On call after hours for member emergencies only. =========================================================================== -----BEGIN PGP SIGNATURE----- Comment: https://auscert.org.au/gpg-key/ iQIVAwUBY9x66ckNZI30y1K9AQiIdg//cRtphxvi4+0I4LEkvQRW0u4n8KfwAxd8 4LD//2ZIbMhO3YrifZKZ0+afycSOjVks38c9dXK5A69Ir0GG0VBThIS2F9LbfpQC 38ksYtxzEHpj7AXmsliIUEG4BYWMWRM8mo0w/YFPIakJpf6c98YS6oLpS6fyt33E 6BwbKpEJDsjoMJyDcKv2F9JqJWquXLPBx4FDdi/ZYhYNUAIqo6KQ46Gx6BaRo4sf 2QBmy0MMM8DHZIr77bqvKezb5hdBZ6Q5aOgV1Df0RN5e6idM+Qf5JaMZYdXS11hX M11wGkR8V9KfuIoyxky2xx3DO7Lq/ugMPSjhmFL8r3DVfIm1KMvmQGI/y8BaFk6x qG3Y4Ten4Z9rMIIic+JnWqjV3bAWFjMnjNmpBlxTo0GmJlXqZSvTxgjFbFcUeFeZ H0MRsiutGupzHOtjoAAqov/b2D2wIlnZzCh9Jv23rRmihcgKNGQdQhUCSpSzI1n+ 4fq8LHgfk9X/L6rt9eVDNTXnvn4fNn7ydk9RsNF3j6xndzLA7v9NwY8Kmee8g4yW AGBv9EHDn3YXFrwne4OZbBNbEpoPXsU0ngAqZz5+pXoRTivDd/1rw6c3RLL9Ym+V a3tzsoFQNrWBxgyMNK4HR798/U/jEQgt+sTSeiL/4NFSVnBXhrYHrJaudfKd83k9 L1b1WciR45M= =CnNJ -----END PGP SIGNATURE-----