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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2019.0531 Cisco Firepower Threat Defense Software SSL or TLS Denial of Service Vulnerability 21 February 2019 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Cisco Firepower Threat Defense Publisher: Cisco Systems Operating System: Cisco Impact/Access: Denial of Service -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2019-1691 Original Bulletin: https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190220-fpwr-ssltls-dos - --------------------------BEGIN INCLUDED TEXT-------------------- Cisco Firepower Threat Defense Software SSL or TLS Denial of Service Vulnerability Priority: Medium Advisory ID: cisco-sa-20190220-fpwr-ssltls-dos First Published: 2019 February 20 16:00 GMT Version 1.0: Final Workarounds: No workarounds available Cisco Bug IDs: CSCvj97647 CVE-2019-1691 CWE-20 CVSS Score: 5.8 AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L/E:X/RL:X/RC:X Summary o A vulnerability in the detection engine of Cisco Firepower Threat Defense Software could allow an unauthenticated, remote attacker to cause the unexpected restart of the SNORT detection engine, resulting in a denial of service (DoS) condition. The vulnerability is due to the incomplete error handling of the SSL or TLS packet header during the connection establishment. An attacker could exploit this vulnerability by sending a crafted SSL or TLS packet during the connection handshake. An exploit could allow the attacker to cause the SNORT detection engine to unexpectedly restart, resulting in a partial DoS condition while the detection engine restarts. 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-20190220-fpwr-ssltls-dos Affected Products o Vulnerable Products This vulnerability affects Cisco Firepower Threat Defense Software. For information about affected software releases, consult the Cisco bug ID(s) at the top of this advisory. Products Confirmed Not Vulnerable Only products listed in the Vulnerable Products section of this advisory are known to be affected by this vulnerability. Workarounds o There are no workarounds that address this vulnerability. Fixed Software o 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. Exploitation and Public Announcements o 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 o This vulnerability was found during internal security testing. 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 URL o https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory./ cisco-sa-20190220-fpwr-ssltls-dos Revision History o +----------+--------------------------+----------+--------+-------------------+ | Version | Description | Section | Status | Date | +----------+--------------------------+----------+--------+-------------------+ | 1.0 | Initial public release. | -- | Final | 2019-February-20 | +----------+--------------------------+----------+--------+-------------------+ - --------------------------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). On call after hours for member emergencies only. =========================================================================== -----BEGIN PGP SIGNATURE----- Comment: http://www.auscert.org.au/render.html?it=1967 iQIVAwUBXG3j9WaOgq3Tt24GAQjZvxAAyYzOevJVsvMCIK10vs1ZLp2de1hA9Yn0 VZN9sLAsWgnSTU6TGqUMxGLEw7GMxI0n3SQvr00Ha5LV6B91XSaWaA7hZRvxhDs7 GAq5zZmZ1sgVGpqqMGqO+SA7R61xpPpgrEMZhodZuOgutwsZbd836eMtv1grPWxg 5D2J67o+3371w1CgkWP1wNyn10RSlLwTEPNCoXMsXTNS22L8qVoGZhieuL1IWU4i 0odWd01Sdv/aerTozlFFTpRj4pqjKR8b88z6W57oLjpcKglvAKgV2X0yTK/wQo5t Sd5qxdwAAin7YnYr8UHSqCG+eOVV/2/GxHtAHgOUhl/TqNC0Ll5lEjvBPz9IvFcs cp/jqEEN+aEre+qPyByn13dbowWeQcfKku+MwjFqEwapnwJ7CO9iudgt/LWgS9oZ myTCeCYgx4tTKX8IXvJXxNI87HxzYOMAEMvoyEArcrd1xL9APcyJjbdSAuhPXe1i H8x48QMJJsoQPYFNVBDueGUsr3GS3hOuq8EJXigqJKw5B00Cm8j8e+d6OjViC7mc xh4DkhNIWfh9LEPt2OTqV1KvN594NhfAY7DVko3eazQA+vKPI0e/5Sz/j4DTedA5 ODB6g92VU5lzT5J+AW8Do4pZNlFSI/9tDkJN5aULMcbAeNMj+Nxx6UiMajNCcNGh kasRTl3pSRs= =bCo3 -----END PGP SIGNATURE-----