Juniper Junos ALG Fragmented Traffic Handling MS-MPC / MS-MIC Service PIC DoS (JSA10794)

This script is Copyright (C) 2017 Tenable Network Security, Inc.


Synopsis :

The remote device is missing a vendor-supplied security patch.

Description :

According to its self-reported version and model number, the remote
Juniper Junos device is affected by a denial of service vulnerability
in the Application Layer Gateway (ALG) that is triggered when handling
a large amount of fragmented packets. An unauthenticated, remote
attacker can exploit this to crash an MS-MPC or MS-MIC service
physical interface card (PIC).

Note that the device is only vulnerable if NAT or stateful-firewall
rules are configured with ALGs enabled

See also :

https://kb.juniper.net/InfoCenter/index?page=content&id=JSA10794

Solution :

Upgrade to the relevant Junos software release referenced in Juniper
security advisory JSA10794. Alternatively, disable NAT and the
stateful-firewall if they are not required.

Risk factor :

High / CVSS Base Score : 7.1
(CVSS2#AV:N/AC:M/Au:N/C:N/I:N/A:C)
CVSS Temporal Score : 5.3
(CVSS2#E:U/RL:OF/RC:C)
Public Exploit Available : false

Family: Junos Local Security Checks

Nessus Plugin ID: 102707 ()

Bugtraq ID:

CVE ID: CVE-2017-2346

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