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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2017.2413 Advisory (ICSA-17-264-03): Digium Asterisk GUI 22 September 2017 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Digium Asterisk GUI Publisher: ICS-CERT Operating System: Linux variants Impact/Access: Execute Arbitrary Code/Commands -- Existing Account Resolution: Alternate Program CVE Names: CVE-2017-14001 Original Bulletin: https://ics-cert.us-cert.gov/advisories/ICSA-17-264-03 - --------------------------BEGIN INCLUDED TEXT-------------------- Advisory (ICSA-17-264-03) Digium Asterisk GUI Original release date: September 21, 2017 Legal Notice All information products included in http://ics-cert.us-cert.gov are provided "as is" for informational purposes only. The Department of Homeland Security (DHS) does not provide any warranties of any kind regarding any information contained within. DHS does not endorse any commercial product or service, referenced in this product or otherwise. Further dissemination of this product is governed by the Traffic Light Protocol (TLP) marking in the header. For more information about TLP, see http://www.us-cert.gov/tlp/. CVSS v3 8.8 ATTENTION: Remotely exploitable/low skill level to exploit. Vendor: Digium Equipment: Asterisk GUI Vulnerability: Improper Neutralization of Special Elements used in an OS Command AFFECTED PRODUCTS The following versions of Asterisk GUI, a framework for configuring graphical user interfaces, are affected: Asterisk GUI 2.1.0 and prior IMPACT Successful exploitation of this vulnerability could cause an authenticated attacker to execute arbitrary code on the device. MITIGATION Asterisk GUI is no longer maintained and should not be used. Digium recommends affected users to migrate to Digiums SwitchVox product. NCCIC/ICS-CERT recommends that users take defensive measures to minimize the risk of exploitation of this vulnerability. Specifically, users should: Minimize network exposure for all control system devices and/or systems, and ensure that they are not accessible from the Internet. Locate control system networks and remote devices behind firewalls, and isolate them from the business network. When remote access is required, use secure methods, such as Virtual Private Networks (VPNs), recognizing that VPNs may have vulnerabilities and should be updated to the most current version available. Also recognize that VPN is only as secure as the connected devices. ICS-CERT reminds organizations to perform proper impact analysis and risk assessment prior to deploying defensive measures. ICS-CERT also provides a section for control systems security recommended practices on the ICS-CERT web page. Several recommended practices are available for reading and download, including Improving Industrial Control Systems Cybersecurity with Defense-in-Depth Strategies. Additional mitigation guidance and recommended practices are publicly available in the ICS-CERT Technical Information Paper, ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation Strategies, that is available for download from the ICS-CERT web site. Organizations observing any suspected malicious activity should follow their established internal procedures and report their findings to ICS-CERT for tracking and correlation against other incidents. No known public exploits specifically target this vulnerability. VULNERABILITY OVERVIEW IMPROPER NEUTRALIZATION OF SPECIAL ELEMENTS USED IN AN OS COMMAND ('OS COMMAND INJECTION') CWE-78 An OS command injection vulnerability has been identified that may allow the execution of arbitrary code on the system through the inclusion of OS commands in the URL request of the program. CVE-2017-14001 has been assigned to this vulnerability. A CVSS v3 base score of 8.8 has been assigned; the CVSS vector string is (AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H). RESEARCHER Davy Douhine of RandoriSec reported the vulnerability to ICS-CERT. BACKGROUND Critical Infrastructure Sector(s): Commercial Facilities, Communications, and Critical Manufacturing. Countries/Areas Deployed: Worldwide Company Headquarters Location: Alabama, United States Contact Information For any questions related to this report, please contact ICS-CERT at: Email: ics-cert@hq.dhs.gov (link sends e-mail) Toll Free: 1-877-776-7585 International Callers: (208) 526-0900 For industrial control systems security information and incident reporting: http://ics-cert.us-cert.gov ICS-CERT continuously strives to improve its products and services. You can help by choosing one of the links below to provide feedback about this product. - --------------------------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: http://www.auscert.org.au/render.html?cid=1980 =========================================================================== 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). On call after hours for member emergencies only. =========================================================================== -----BEGIN PGP SIGNATURE----- Comment: http://www.auscert.org.au/render.html?it=1967 iQIVAwUBWcRwr4x+lLeg9Ub1AQh+0BAAqBAs4CdoE13jDRzW2CX+bj1MRQXpZzYX ZN8FXYltLdI6E3gHDvYIhHDyFg0E3hkThQJNFpDtOfPm4dqRTVFWBC8S9dN9S9Wk 8yUadsjbk+DZH+iZv4ETSUff6mYFOopeiw6UxdVhH4g34bxvZi67K0PKpyqePo0i fbMIqBgklJmNgkhv06v+tucN2Z5BEynXj4BA360JtgdeB9Ml99RY4/ti6N9BgUqb wckNaukRHHd4osuiKzOq/DU7kt5Neg2R2GrQb2Bni0U30PIX5pktX5u3tNDQTYeA jZmpWx7Yl0hiQWyUuLma/H0i1mSXOhwKCD1EO/7PU6bMwRu9MaLNz4n/t/RZr7NP a8If/+yZYR4DNJFt9QG2UMJcm5x6CWifZglWtSRsd5G/KKQxdGAi12r+4ggq4Rh3 FzQzVTwkda3tazM2RnC4m49OojAQ9qXG+EI3mWDmXYClUacAvwP2NbFR316RD3lA v1EDr0cICZKOGwyXghO1eCzk86TEwLQepcYRyCw4p8o2OqbNhG/RlDP+KbHpG4kP OzluYJOPO9dPNC1zf4SdXkIP7HTsSXuQQ1eRuanMO7fvbMDPXF18YfbzKpjN2466 udnmdUgZuBbkyGoEFY6vNpXIDmCH25WvzFFue6TWAa5kquBlU0GtYdl4xbNbtMOP GINP8REcVxg= =B5iq -----END PGP SIGNATURE-----