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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2019.3825 Security Bulletin: Multiple vulnerabilities in HTTP/2 implementation used by WebSphere Application Server Liberty 15 October 2019 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: IBM WebSphere Application Server Publisher: IBM Operating System: Linux variants AIX HP-UX Solaris IBM i z/OS Windows Impact/Access: Denial of Service -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2019-9518 CVE-2019-9517 CVE-2019-9515 CVE-2019-9514 CVE-2019-9513 CVE-2019-9512 Reference: ASB-2019.0238 ESB-2019.3782 ESB-2019.3772 ESB-2019.3748 Original Bulletin: https://www.ibm.com/support/pages/node/1072860 - --------------------------BEGIN INCLUDED TEXT-------------------- Security Bulletin: Multiple vulnerabilities in HTTP/2 implementation used by WebSphere Application Server Liberty Document Information Product : WebSphere Application Server Component : Liberty Software version : All Versions Operating system(s): AIX HP-UX IBM i Linux Solaris Windows z/OS Software Edition : Liberty Reference # : 1072860 Modified date : 14 October 2019 Summary There are multiple vulnerabilities in the HTTP/2 implementation that is used by WebSphere Application Server Liberty. This affects the servlet-4.0 and servlet-3.1 features. These vulnerabilities have been addressed. Vulnerability Details CVEID: CVE-2019-9518 DESCRIPTION: Multiple vendors are vulnerable to a denial of service, caused by a Empty Frame Flooding attack. By sending a stream of frames with an empty payload and without the end-of-stream flag, a remote attacker could consume excessive CPU resources. CVSS Base Score: 7.5 CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/ 164904 for the current score CVSS Environmental Score*: Undefined CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H) CVEID: CVE-2019-9517 DESCRIPTION: Multiple vendors are vulnerable to a denial of service, caused by an Internal Data Buffering attack. By opening the HTTP/2 window so the peer can send without constraint and sending a stream of requests for a large response object, a remote attacker could consume excessive CPU resources. CVSS Base Score: 7.5 CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/ 165183 for the current score CVSS Environmental Score*: Undefined CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H) CVEID: CVE-2019-9515 DESCRIPTION: Multiple vendors are vulnerable to a denial of service, caused by a Settings Flood attack. By sending a stream of SETTINGS frames to the peer, a remote attacker could consume excessive CPU resources. CVSS Base Score: 7.5 CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/ 165181 for the current score CVSS Environmental Score*: Undefined CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H) CVEID: CVE-2019-9514 DESCRIPTION: Multiple vendors are vulnerable to a denial of service, caused by a Reset Flood attack. By opening a number of streams and sending an invalid request over each stream, a remote attacker could consume excessive CPU resources. CVSS Base Score: 7.5 CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/ 164640 for the current score CVSS Environmental Score*: Undefined CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H) CVEID: CVE-2019-9513 DESCRIPTION: Multiple vendors are vulnerable to a denial of service, caused by a Resource Loop attack. By creating multiple request streams and continually shuffling the priority of the streams, a remote attacker could consume excessive CPU resources. CVSS Base Score: 7.5 CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/ 164639 for the current score CVSS Environmental Score*: Undefined CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H) CVEID: CVE-2019-9512 DESCRIPTION: Multiple vendors are vulnerable to a denial of service, caused by a Ping Flood attack. By sending continual pings to an HTTP/2 peer, a remote attacker could consume excessive CPU resources. CVSS Base Score: 7.5 CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/ 164903 for the current score CVSS Environmental Score*: Undefined CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H) Affected Products and Versions These vulnerabilities affect the following versions and releases of IBM WebSphere Application Server: o Liberty 18.0.0.2 - 19.0.0.9 Remediation/Fixes The recommended solution is to apply the interim fix, Fix Pack or PTF containing the APAR for each named product as soon as practical. For WebSphere Application Server Liberty using servlet-4.0 or servlet-3.1 feature: Upgrade to minimal fix pack levels as required by interim fix and then apply Interim Fix PH16611 - --OR-- Apply Fix Pack 19.0.0.10 or later (targeted availability 4Q2019). Additional interim fixes may be available and linked off the interim fix download page. Change History 14 October 2019:original document published *The CVSS Environment Score is customer environment specific and will ultimately impact the Overall CVSS Score. Customers can evaluate the impact of this vulnerability in their environments by accessing the links in the Reference section of this Security Bulletin. Disclaimer According to the Forum of Incident Response and Security Teams (FIRST), the Common Vulnerability Scoring System (CVSS) is an "industry open standard designed to convey vulnerability severity and help to determine urgency and priority of response." IBM PROVIDES THE CVSS SCORES ""AS IS"" WITHOUT WARRANTY OF ANY KIND, INCLUDING THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. CUSTOMERS ARE RESPONSIBLE FOR ASSESSING THE IMPACT OF ANY ACTUAL OR POTENTIAL SECURITY VULNERABILITY. - --------------------------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. 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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 iQIVAwUBXaUgs2aOgq3Tt24GAQhIRw/+IrHI9csHK/CqweFEb8nVXRjWfLGsH+Er HED+PuAu7oasifAD/bZfNeIabKmUQjp6GkKwyO+z6U47vaQSNN7mUnFQtyC1QBVS 8l1vVNmlfd2ueCw0Ih3F0I90Nbgq+yqWeZ7wbN2IE/z7+7hYCGA59zJB6CvfS/zV oOHl+hT5/5RhuVtTTQhIFVxEUUyDCvllgh+umrEK1y0j/O46zw5ipjLlJ49QKKIG cr9w82DKmt3Dn+JQiF2K0ZN1NVODuEUhkNW/gLTGIPb+77TEdhSVy9PE+JRqjGa+ ySia8ALwgpXbmPAKJo8odFmIqahHK5M3crEuCjeafHVy7IF51GEnXe8QOrwLjWi1 +oJTHXXT2J21bcwRw6KMPYAessvhxNvz/Rjd6X4jCrLfMSK0Q3ufclJf1U2/KRq3 yUrObWuF3jkqqrZca+LZKu3b3zHjbq9CpxvPwFcMBAR3AJbJzCQif84YjV/vAIuF tZ9W56rgO9rVo7F8PdpgBEYTCKWW9mViER/2qSrKVwIIyhZh6UVaicWK0Q7rb+wy E6MPvjX84hPOPL7ymdATkVF3/jxfh6ABtI9iewohd3tKjBDJXHu89M0hb5/z3v4Y koxou01A6Kezb8jREwiNNa9qUffYB7k/LWnnP6qJQhD3lEfF9zHzKldPayWszrKl 5IrE5iVlzpg= =WRgg -----END PGP SIGNATURE-----