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Vulnerability of ScreenOS: denial of service via L2TP

Synthesis of the vulnerability 

An attacker can send a malicious L2TP packet to ScreenOS, in order to trigger a denial of service.
Impacted systems: ScreenOS.
Severity of this alert: 2/4.
Creation date: 15/10/2015.
Références of this alert: CERTFR-2015-AVI-431, CVE-2015-7750, JSA10704, VIGILANCE-VUL-18107.

Description of the vulnerability 

The ScreenOS product has a service to manage received L2TP packets.

However, when a malicious packet is received, a fatal error occurs.

An attacker can therefore send a malicious L2TP packet to ScreenOS, in order to trigger a denial of service.
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This vulnerability impacts software or systems such as ScreenOS.

Our Vigil@nce team determined that the severity of this security announce is medium.

The trust level is of type confirmed by the editor, with an origin of intranet client.

An attacker with a expert ability can exploit this computer vulnerability note.

Solutions for this threat 

ScreenOS: versions 6.3.0r13-dnd1, 6.3.0r18-dnc1 and 6.3.0r21.
Versions 6.3.0r13-dnd1, 6.3.0r18-dnc1 and 6.3.0r21 are fixed.
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