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Vigil@nce - Cisco Web Security Appliance: denial of service via Native FTP
August 2016 by Vigil@nce
This bulletin was written by Vigil@nce : https://vigilance.fr/offer
SYNTHESIS OF THE VULNERABILITY
An attacker can raise high CPU use via the Native FTP proxy of
Cisco Web Security Appliance, in order to trigger a denial of
service.
Impacted products: AsyncOS, Cisco WSA.
Severity: 2/4.
Creation date: 28/06/2016.
DESCRIPTION OF THE VULNERABILITY
The Cisco Web Security Appliance product offers a FTP proxy
service.
However, when the FTP client terminates the command connection
after data transfers over the data connections, the product enters
in a loop that overloads the CPU.
An attacker can therefore raise high CPU use via the Native FTP
proxy of Cisco Web Security Appliance, in order to trigger a
denial of service.
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