Vulnerability Description
Jonathan Looney discovered that the Linux kernel default MSS is hard-coded to 48 bytes. This allows a remote peer to fragment TCP resend queues significantly more than if a larger MSS were enforced. A remote attacker could use this to cause a denial of service. This has been fixed in stable kernel releases 4.4.182, 4.9.182, 4.14.127, 4.19.52, 5.1.11, and is fixed in commits 967c05aee439e6e5d7d805e195b3a20ef5c433d6 and 5f3e2bf008c2221478101ee72f5cb4654b9fc363.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | >= 4.4, < 4.4.182 |
| F5 | Big-Ip Advanced Firewall Manager | >= 11.5.2, < 11.6.5.1 |
| F5 | Big-Ip Access Policy Manager | >= 11.5.2, < 11.6.5.1 |
| F5 | Big-Ip Application Acceleration Manager | >= 11.5.2, < 11.6.5.1 |
| F5 | Big-Ip Link Controller | >= 11.5.2, < 11.6.5.1 |
| F5 | Big-Ip Policy Enforcement Manager | >= 11.5.2, < 11.6.5.1 |
| F5 | Big-Ip Webaccelerator | >= 11.5.2, < 11.6.5.1 |
| F5 | Big-Ip Application Security Manager | >= 11.5.2, < 11.6.5.1 |
| F5 | Big-Ip Local Traffic Manager | >= 11.5.2, < 11.6.5.1 |
| F5 | Big-Ip Fraud Protection Service | >= 11.5.2, < 11.6.5.1 |
| F5 | Big-Ip Global Traffic Manager | >= 11.5.2, < 11.6.5.1 |
| F5 | Big-Ip Analytics | >= 11.5.2, < 11.6.5.1 |
| F5 | Big-Ip Edge Gateway | >= 11.5.2, < 11.6.5.1 |
| F5 | Big-Ip Domain Name System | >= 11.5.2, < 11.6.5.1 |
| Canonical | Ubuntu Linux | 14.04 |
| Redhat | Enterprise Linux | 7.0 |
| F5 | Big-Iq Centralized Management | >= 5.1.0, <= 5.4.0 |
| F5 | Enterprise Manager | 3.1.1 |
| F5 | Iworkflow | 2.3.0 |
| F5 | Traffix Signaling Delivery Controller | >= 5.0.0, <= 5.1.0 |
Related Weaknesses (CWE)
References
- http://www.arubanetworks.com/assets/alert/ARUBA-PSA-2020-010.txtThird Party Advisory
- http://www.openwall.com/lists/oss-security/2019/06/28/2Mailing ListThird Party Advisory
- http://www.openwall.com/lists/oss-security/2019/07/06/3Mailing ListThird Party Advisory
- http://www.openwall.com/lists/oss-security/2019/07/06/4Mailing ListThird Party Advisory
- http://www.securityfocus.com/bid/108818Third Party AdvisoryVDB Entry
- https://access.redhat.com/errata/RHSA-2019:1594Third Party Advisory
- https://access.redhat.com/errata/RHSA-2019:1602Third Party Advisory
- https://access.redhat.com/errata/RHSA-2019:1699Third Party Advisory
- https://access.redhat.com/security/vulnerabilities/tcpsackThird Party Advisory
- https://cert-portal.siemens.com/productcert/pdf/ssa-462066.pdfThird Party Advisory
- https://git.kernel.org/pub/scm/linux/kernel/git/davem/net.git/commit/?id=5f3e2bfMailing ListPatchVendor Advisory
- https://git.kernel.org/pub/scm/linux/kernel/git/davem/net.git/commit/?id=967c05aMailing ListPatchVendor Advisory
- https://github.com/Netflix/security-bulletins/blob/master/advisories/third-partyPatchThird Party Advisory
- https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA44193Third Party Advisory
- https://kc.mcafee.com/corporate/index?page=content&id=SB10287Third Party Advisory
FAQ
What is CVE-2019-11479?
CVE-2019-11479 is a vulnerability with a CVSS score of 7.5 (HIGH). Jonathan Looney discovered that the Linux kernel default MSS is hard-coded to 48 bytes. This allows a remote peer to fragment TCP resend queues significantly more than if a larger MSS were enforced. A...
How severe is CVE-2019-11479?
CVE-2019-11479 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2019-11479?
Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel, F5 Big-Ip Advanced Firewall Manager, F5 Big-Ip Access Policy Manager, F5 Big-Ip Application Acceleration Manager, F5 Big-Ip Link Controller.