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vulnerability alert CVE-2013-6016

F5 BIG-IP: denial of service of TMM via TCP

Synthesis of the vulnerability

An attacker can initialize a TCP session to F5 BIG-IP, in order to trigger a denial of service.
Impacted products: BIG-IP Appliance.
Severity: 2/4.
Creation date: 17/10/2013.
Identifiers: BID-63245, CVE-2013-6016, SOL13233, VIGILANCE-VUL-13616.

Description of the vulnerability

The TMM (Traffic Management Microkernel) manages the load balancing.

The establishment of a TCP session requires three packets:
 - SYN
 - SYN-ACK
 - ACK

However, in some cases, BIG-IP transits the TCP session to the ESTABLISHED state, before receiving the ACK packet. This error then leads to a segmentation error, or to an assertion of TMM.

An attacker can therefore initialize a TCP session to F5 BIG-IP, in order to trigger a denial of service.
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