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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2017.1745 2017-07 Security Bulletin: MS-MPC or MS-MIC crash when passing large fragmented traffic through an ALG (CVE-2017-2346) 13 July 2017 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Juniper MX Series Publisher: Juniper Networks Operating System: Juniper Impact/Access: Denial of Service -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2017-2346 Reference: ESB-2017.1742 Original Bulletin: https://kb.juniper.net/InfoCenter/index?page=content&id=JSA10794 - --------------------------BEGIN INCLUDED TEXT-------------------- 2017-07 Security Bulletin: MS-MPC or MS-MIC crash when passing large fragmented traffic through an ALG (CVE-2017-2346) PRODUCT AFFECTED: This issue affects Junos OS 14.1X55, 14.2R, 15.1R, and 16.1R running on MX Series. PROBLEM: An MS-MPC or MS-MIC Service PIC may crash when large fragmented packets are passed through an Application Layer Gateway (ALG). Repeated crashes of the Service PC can result in an extended denial of service condition. The issue can be seen only if NAT or stateful-firewall rules are configured with ALGs enabled. This issue was caused by the code change for PR 1182910 in Junos OS 14.1X55-D30, 14.1X55-D35, 14.2R7, 15.1R5, and 16.1R2. No other versions of Junos OS and no other Juniper Networks products or platforms are affected by this issue. Affected releases are Juniper Networks Junos OS on MX platforms running: 14.1X55 from 14.1X55-D30 to releases prior to 14.1X55-D35; 14.2R from 14.2R7 to releases prior to 14.2R7-S4, 14.2R8; 15.1R from 15.1R5 to releases prior to 15.1R5-S2, 15.1R6; 16.1R from 16.1R2 to releases prior to 16.1R3-S2, 16.1R4. Juniper SIRT is not aware of any malicious exploitation of this vulnerability. This issue has been assigned CVE-2017-2346. SOLUTION: The following software releases have been updated to resolve this specific issue: 14.1X55-D35, 14.2R7-S4, 14.2R8, 15.1R5-S2, 15.1R6, 16.1R3-S2, 16.1R4, and all subsequent releases. This issue is being tracked as PR 1214134 and is visible on the Customer Support website. WORKAROUND: No known workaround exists for this issue. If NAT and stateful-firewall are not required, disabling them in the [edit applications] stanza will mitigate this issue. IMPLEMENTATION: Security vulnerabilities in Junos are fixed in the next available Maintenance Release of each supported Junos version. In some cases, a Maintenance Release is not planned to be available in an appropriate time-frame. For these cases, Service Releases are made available in order to be more timely. Security Advisory and Security Notices will indicate which Maintenance and Service Releases contain fixes for the issues described. Upon request to JTAC, customers will be provided download instructions for a Service Release. Although Juniper does not provide formal Release Note documentation for a Service Release, a list of "PRs fixed" can be provided on request. MODIFICATION HISTORY: 2017-07-12: Initial Publication. RELATED LINKS: KB16613: Overview of the Juniper Networks SIRT Quarterly Security Bulletin Publication Process KB16765: In which releases are vulnerabilities fixed? KB16446: Common Vulnerability Scoring System (CVSS) and Juniper's Security Advisories Report a Vulnerability - How to Contact the Juniper Networks Security Incident Response Team CVE-2017-2346: MS-MPC or MS-MIC crash when passing large fragmented traffic through an ALG CVSS SCORE: 5.9 (CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H) RISK LEVEL: Medium RISK ASSESSMENT: Information for how Juniper Networks uses CVSS can be found at KB 16446 "Common Vulnerability Scoring System (CVSS) and Juniper's Security Advisories." - --------------------------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 iQIVAwUBWWcI7Ix+lLeg9Ub1AQiPMg//RSidDHTeCT6Q87p92H+t1goY6Rcsnrz2 R/AqutsPRIrtcPMvNt2UofCp4n1igGzksPUrxFpXQr4RIKUGIvnrG0qF9+9uoapr C3PYhH2ZGByqPIK2BjCnG2LG0KOmRzQnCOUk+fQeGS4WY8VKRc5JjQM6tmgkLmnD U9QDNxFBJCx4DF/BnOUpfTAcs++VRKB0rliNoIwbkBn6f0D/Gtw0RQZp+r5PabMb ZCf0cRvLpTurOHNBvSYioUUrgQddWg4+m9+RxqWUt9UTKlyWDZgK8mJCy11qIJEK rQ7kt7qwbzJc9+JMVjAHx9lX7PK0Hqeih/nNDuGbsxJz1HwHQYz8kb3xo9o1qJ6o +FcsVg3gogE+cmo2tUEIdZ1B5huon+iDTs4eMEVsuF1PZeqaZbdBNXyVMJwQvIci rjFp/+1WexzO6x+PkaPECAdGgyqYByh0ZnOYkPhoykJOQgLgzJzr8NH1+SpMwoL3 VcGo6P1sBj52SF/6nv2HA7ge4yN/yAex9fBFW1iMjQ+AbsNFPHj5+w+u2+Ks5LWt bXqzvZpzaveHKWyz+l1GUf+gKAGHNzdthX3UoXfBTSrYK/3esWViejU6AwSZrOWN OUlKGfj9uSXNp7xsDuDdYrZpr9/LQpnNnQDmRoToW1xEk9iT/2b3GlAScX+/u5CM Z9Hv6mTHcSQ= =ZvRc -----END PGP SIGNATURE-----