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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2014.0783 Security Bulletin: IBM HTTP Server CPU utilization (CVE-2014-0963) 21 May 2014 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: IBM HTTP Server Publisher: IBM Operating System: AIX HP-UX IBM i Linux variants Solaris Windows z/OS Impact/Access: Denial of Service -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2014-0963 CVE-2014-0098 Reference: ESB-2014.0782 ESB-2014.0764 ESB-2014.0714 ESB-2014.0702 ESB-2014.0679 ESB-2014.0438 ESB-2014.0396 Original Bulletin: http://www-01.ibm.com/support/docview.wss?uid=swg21672843 Comment: This bulletin contains two (2) IBM security advisories. - --------------------------BEGIN INCLUDED TEXT-------------------- Security Bulletin: IBM HTTP Server CPU utilization (CVE-2014-0963) Security Bulletin Document information More support for: WebSphere Application Server IBM HTTP Server Software version: 6.0.2, 6.1, 7.0, 8.0, 8.5, 8.5.5 Operating system(s): AIX, HP-UX, IBM i, Linux, Solaris, Windows, z/OS Software edition: Base, Developer, Enterprise, Network Deployment Reference #: 1672843 Modified date: 2014-05-15 Summary IBM HTTP Server is affected by a problem related to the SSL implementation which, under very specific conditions, can cause CPU utilization to rapidly increase. Vulnerability Details CVE ID: CVE-2014-0963 DESCRIPTION: IBM HTTP Server is affected by a problem with the handling of certain SSL messages. The TLS implementation can, under very specific conditions, cause CPU utilization to rapidly increase. The situation occurs only in a certain error case that causes a single thread to begin looping. If this happens multiple times, more threads will begin to loop and an increase in CPU utilization will be seen. This increase could ultimately result in CPU exhaustion and unresponsiveness of the IBM HTTP Server and other software running on the affected system. This issue can affect the availability of the system, but does not impact system confidentiality or integrity. This vulnerability can be remotely exploited, authentication is not required and the exploit is moderately complex. To determine if your systems are being affected by this issue, you can monitor the CPU utilization for IBM HTTP Server instances, or monitor the mod_mpmstats output written to the ErrorLog. CVSS Base Score: 7.1 CVSS Temporal Score: See http://xforce.iss.net/xforce/xfdb/92844 for the current score CVSS Environmental Score*: Undefined CVSS Vector: (AV:N/AC:M/Au:N/C:N/I:N/A:C) Affected Products and Versions This problem affects the IBM HTTP Server component in all editions of WebSphere Application Server and bundling products: Version 8.5.5 Version 8.5 Version 7.0 Version 6.1 Version 6.0 Remediation/Fixes The recommended solutions is to apply the interim fix, Fix Pack or PTF containing APAR PI17025 for each named product as soon as practical For affected IBM HTTP Server for WebSphere Application Server: For V8.5.0.0 through 8.5.5.2 Full Profile: Apply Interim Fix PI17025 - --OR-- Apply Fix Pack 8.5.5.3 or later (targeted to be available 18 August 2014). For V8.0 through 8.0.0.8: Apply Interim Fix PI17025 - --OR-- Apply Fix Pack 8.0.0.9 or later (targeted to be available 23 June 2014). For V7.0.0.0 through 7.0.0.31: Apply Interim Fix PI17025 - --OR-- Apply Fix Pack 7.0.0.33 or later (targeted to be available 23 June 2014). For V6.1.0.0 through 6.1.0.47: Apply Interim Fix PI17025 For V6.0.0.0 through 6.0.2.43: Apply Interim Fix PI17025 Workarounds and Mitigations Use any of these workarounds: For Any Release: Disable mod_reqtimeout by commenting out both the line beginning with "LoadModule reqtimeout_module..." in httpd.conf and any line beginning with "RequestReadTimeout". Note: This is not intuitive, but CVE-2014-0963 does not manifest in IBM HTTP Server without mod_reqtimeout also loaded. Configure very short thresholds with mod_reqtimeout, which shortens the amount of time a thread can be tied up by CVE-2014-0963. See the RequestReadTimeout directive. Monitor CPU utilization of your IBM HTTP Server instances. If utilization becomes abnormally high, stop and restart the affected instance. Monitor mod_mpmstats output for unusual build-up of threads with active module "mod_ibm_ssl" Important note IBM strongly suggests that all System z customers be subscribed to the System z Security Portal to receive the latest critical System z security and integrity service. If you are not subscribed, see the instructions on the System z Security web site. Security and integrity APARs and associated fixes will be posted to this portal. IBM suggests reviewing the CVSS scores and applying all security or integrity fixes as soon as possible to minimize any potential risk. References Complete CVSS Guide On-line Calculator V2 Related information IBM Secure Engineering Web Portal IBM Product Security Incident Response Blog Change History 15 May 2014: 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. Cross reference information Segment Product Component Platform Version Edition Application Servers IBM HTTP Server SSL Application Servers WebSphere Application Server Hypervisor Edition - ---------------------------------------------------------------------------- Security Bulletin: Potential Denial of Service in IBM HTTP Server CVE-2014-0098 Security Bulletin Document information More support for: WebSphere Application Server IBM HTTP Server Software version: 6.1, 7.0, 8.0, 8.5, 8.5.5 Operating system(s): AIX, HP-UX, Linux, Solaris, Windows, i5/OS, z/OS Software edition: Base, Developer, Enterprise, Network Deployment Reference #: 1667526 Modified date: 2014-05-15 Summary Potential Denial of Service in IBM HTTP Server for IBM WebSphere Application Server. Vulnerability Details CVEID: CVE-2014-0098 Description: IBM HTTP Server may be vulnerable to a denial of service, caused by certain cookies being logged in the access log. A remote attacker could exploit this vulnerability to cause the server process to hang or crash. This only affects users that have modified their configuration to add cookie logging. CVSS Base Score: 5.0 CVSS Temporal Score: See http://xforce.iss.net/xforce/xfdb/91879 for the current score CVSS Environmental Score*: Undefined CVSS Vector: (AV:N/AC:L/Au:N/C:N/I:N/A:P) Affected Products and Versions This problem affects the IBM HTTP Server component in all editions of WebSphere Application Server and all products that bundle WebSphere Application Server: Version 8.5.5 Version 8.5 Version 8 Version 7 Version 6.1 Remediation/Fixes The recommended solution is to apply the Fix Pack for each named product as soon as practical. Fix:Apply a Fix Pack containing this APAR PI13028, as noted below: For affected IBM HTTP Server for WebSphere Application Server: For V8.5.0.0 through 8.5.5.1 Full Profile: Upgrade to a miniumum Fix Pack Level 8.5.0.2 Apply Interim Fix PI13028 - --OR-- Apply Fix Pack 8.5.5.3 or later (targeted to be available 18 August 2014). For V8.0 through 8.0.0.8: Upgrade to a minimum Fix Pack Level 8.0.0.6 Apply Interim Fix PI13028 - --OR-- Apply Fix Pack 8.0.0.9 or later (targeted to be available 23 June 2014). For V7.0.0.0 through 7.0.0.31: Upgrade to a minimum Fix Pack Level 7.0.0.29 Apply Interim Fix PI13028 - --OR-- Apply Fix Pack 7.0.0.33 or later (targeted to be available 23 June 2014). For V6.1.0.0 through 6.1.0.47: Ensure you are at Fix Pack 6.1.0.47 then apply Interim Fix PI13028 Workarounds and Mitigations Do not log individual cookies. You may log the whole cookie header without being vulnerable. Important note IBM strongly suggests that all System z customers be subscribed to the System z Security Portal to receive the latest critical System z security and integrity service. If you are not subscribed, see the instructions on the System z Security web site. Security and integrity APARs and associated fixes will be posted to this portal. IBM suggests reviewing the CVSS scores and applying all security or integrity fixes as soon as possible to minimize any potential risk. References Complete CVSS Guide On-line Calculator V2 Recommended Fix List for IBM WebSphere Application Server Related information IBM Secure Engineering Web Portal IBM Product Security Incident Response Blog Change History 15 May 2014: Original 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. 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). 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