NetSight
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high7.5

CVE-2019-11479

Jonathan Looney discovered that the Linux kernel default MSS is hard-coded to 48 bytes.

Impact

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.

Affected products

VendorProductAffected versions
LinuxLinux Kernel
from 4.4 before 4.4.182
from 4.9 before 4.9.182
from 4.14 before 4.14.127
from 4.19 before 4.19.52
from 5.1 before 5.1.11
F5Big-Ip Advanced Firewall Manager
from 11.5.2 before 11.6.5.1
from 12.1.0 before 12.1.5.1
from 13.1.0 before 13.1.3.2
from 14.0.0 before 14.0.1.1
from 14.1.2 before 14.1.2.1
from 15.0.0 before 15.0.1.1
F5Big-Ip Access Policy Manager
from 11.5.2 before 11.6.5.1
from 12.1.0 before 12.1.5.1
from 13.1.0 before 13.1.3.2
from 14.0.0 before 14.0.1.1
from 14.1.2 before 14.1.2.1
from 15.0.0 before 15.0.1.1
F5Big-Ip Application Acceleration Manager
from 11.5.2 before 11.6.5.1
from 12.1.0 before 12.1.5.1
from 13.1.0 before 13.1.3.2
from 14.0.0 before 14.0.1.1
from 14.1.2 before 14.1.2.1
from 15.0.0 before 15.0.1.1
F5Big-Ip Link Controller
from 11.5.2 before 11.6.5.1
from 12.1.0 before 12.1.5.1
from 13.1.0 before 13.1.3.2
from 14.0.0 before 14.0.1.1
from 14.1.2 before 14.1.2.1
from 15.0.0 before 15.0.1.1
F5Big-Ip Policy Enforcement Manager
from 11.5.2 before 11.6.5.1
from 12.1.0 before 12.1.5.1
from 13.1.0 before 13.1.3.2
from 14.0.0 before 14.0.1.1
from 14.1.2 before 14.1.2.1
from 15.0.0 before 15.0.1.1
F5Big-Ip Webaccelerator
from 11.5.2 before 11.6.5.1
from 12.1.0 before 12.1.5.1
from 13.1.0 before 13.1.3.2
from 14.0.0 before 14.0.1.1
from 14.1.2 before 14.1.2.1
from 15.0.0 before 15.0.1.1
F5Big-Ip Application Security Manager
from 11.5.2 before 11.6.5.1
from 12.1.0 before 12.1.5.1
from 13.1.0 before 13.1.3.2
from 14.0.0 before 14.0.1.1
from 14.1.2 before 14.1.2.1
from 15.0.0 before 15.0.1.1
F5Big-Ip Local Traffic Manager
from 11.5.2 before 11.6.5.1
from 12.1.0 before 12.1.5.1
from 13.1.0 before 13.1.3.2
from 14.0.0 before 14.0.1.1
from 14.1.2 before 14.1.2.1
from 15.0.0 before 15.0.1.1
F5Big-Ip Fraud Protection Service
from 11.5.2 before 11.6.5.1
from 12.1.0 before 12.1.5.1
from 13.1.0 before 13.1.3.2
from 14.0.0 before 14.0.1.1
from 14.1.2 before 14.1.2.1
from 15.0.0 before 15.0.1.1
F5Big-Ip Global Traffic Manager
from 11.5.2 before 11.6.5.1
from 12.1.0 before 12.1.5.1
from 13.1.0 before 13.1.3.2
from 14.0.0 before 14.0.1.1
from 14.1.2 before 14.1.2.1
from 15.0.0 before 15.0.1.1
F5Big-Ip Analytics
from 11.5.2 before 11.6.5.1
from 12.1.0 before 12.1.5.1
from 13.1.0 before 13.1.3.2
from 14.0.0 before 14.0.1.1
from 14.1.2 before 14.1.2.1
from 15.0.0 before 15.0.1.1

Weakness classification

CWE-405CWE-770

References