17 May 2017
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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2017.1249 Cisco Snort++ Protocol Decoder Denial of Service Vulnerabilities 17 May 2017 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Cisco Snort++ Protocol Decoder Publisher: Cisco Systems Operating System: Cisco Impact/Access: Denial of Service -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2017-6658 CVE-2017-6657 Original Bulletin: https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170515-snort - --------------------------BEGIN INCLUDED TEXT-------------------- Cisco Security Advisory Cisco Snort++ Protocol Decoder Denial of Service Vulnerabilities Medium Advisory ID: cisco-sa-20170515-snort First Published: 2017 May 15 16:00 GMT Version 1.0: Final Workarounds: No workarounds available CVE-2017-6657 CVE-2017-6658 CWE-399 CVSS Score: Base 8.6, Temporal 8.6 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H/E:X/RL:X/RC:X Summary Two vulnerabilities in the protocol decoders of Snort++ (Snort 3) could allow an unauthenticated, remote attacker to create a Denial of Service (DoS) condition. The vulnerabilities are due to lack of validation in the protocol decoders. An attacker could exploit these vulnerabilities by crafting a malicious packet and sending it through the targeted device. A successful exploit could allow the attacker to cause a DoS condition if the Snort process restarts and traffic inspection is bypassed or traffic is dropped. There are no workarounds that address these vulnerabilities. This advisory is available at the following link: https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170515-snort Affected Products Vulnerable Products These vulnerabilities affect Snort++ (Snort 3, currently in alpha testing stage). Products Confirmed Not Vulnerable Current Snort stable releases are not affected by these vulnerabilities. Workarounds There are no workarounds that address these vulnerabilities. Fixed Software Fixes are available in the GitHub code repository tagged as BUILD_233. Exploitation and Public Announcements Cisco TALOS released a blog post on May 12, 2017 titled Snort++ Vulnerabilities Found. The Cisco Product Security Incident Response Team (PSIRT) is not aware of any public malicious use of the vulnerabilities described in this advisory. Source Cisco would like to thank Bhargava Shastry for reporting these vulnerabilities. Cisco Security Vulnerability Policy 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. URL https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170515-snort Revision History Version Description Section Status Date 1.0 Initial public release. - Final 2017-May-15 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. Cisco Security Vulnerability Policy 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. - --------------------------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 email@example.com 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. 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