Where
AND
-Infinity
0
Severity
5.9
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

On BIG-IP 15.0.0-15.0.1.1, 14.1.0-14.1.2.2, 14.0.0-14.0.1, 13.1.0-13.1.3.1, 12.1.0-12.1.5, and 11.6.0-11.6.5.1, the tmm crashes under certain circumstances when using the connector profile if a specific sequence of connections are made.

First published (updated )
Severity
7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

An excessive resource consumption flaw was found in the way the Linux kernel's networking subsystem processed TCP segments. If the Maximum Segment Size (MSS) of a TCP connection was set to low values, such as 48 bytes, it can leave as little as 8 bytes for the user data, which significantly increases the Linux kernel's resource (CPU, Memory, and Bandwidth) utilization. A remote attacker could use this flaw to cause a denial of service (DoS) by repeatedly sending network traffic on a TCP connection with low TCP MSS.

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Remedy

For mitigation, please refer to the Red Hat Knowledgebase article: https://access.redhat.com/security/vulnerabilities/tcpsack

Remedy

This can be mitigated by dropping all packets which specify a too small MSS value. For example, to only allow MSS values of greater than 500 bytes, an iptables rule can be specified as: sudo iptables -A INPUT -p tcp -m tcpmss --mss 1:500 -j DROP Note: this will only take effect if the net.ipv4.tcp_mtu_probing sysctl is disabled as well.
First published (updated )
Severity
6.7
CVSS:3.0/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

A local user on F5 BIG-IQ Centralized Management 5.1.0-5.2.0 with the Access Manager role has privileges to change the passwords of other users on the system, including the local admin account password.

First published (updated )

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