Juniper Junos SRX Series ALG 'flowd' Remote DoS (JSA10650)
High Nessus Plugin ID 78421
SynopsisThe remote device is missing a vendor-supplied security patch.
DescriptionAccording to its self-reported version number, the remote Juniper Junos SRX series device is affected by a denial of service vulnerability related to ALG (Application Layer Gateway). A remote attacker can exploit this issue by sending a specially crafted SIP packet to an SRX series device, resulting in a crash of the 'flowd' process. Repeated exploitation may result in the device becoming unresponsive.
Note that this issue only affects devices with any ALGs enabled or if flow-based processing for IPv6 traffic is enabled. All SRX devices, except for SRX-HE devices, have the SIP ALG enabled by default.
SolutionApply the relevant Junos software release or workaround referenced in Juniper advisory JSA10650.