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When Packet DMA heap utilization reaches 99%, the system will become unstable. Over time, exploitation of this vulnerability may cause traffic to stop being forwarded, or to crashing of the fxpc process.
#AMT EMULATOR MAC .8 SERIES#
This issue does not affect Junos OS Evolved.Ī vulnerability in processing of certain DHCP packets from adjacent clients on EX Series and QFX Series switches running Juniper Networks Junos OS with DHCP local/relay server configured may lead to exhaustion of DMA memory causing a Denial of Service (DoS). This issue affects Juniper Networks Junos OS: 19.4 versions prior to 19.4R3-S1 20.1 versions prior to 20.1R2-S1, 20.1R3 20.2 versions prior to 20.2R3 20.3 versions prior to 20.3R2. Continued receipt and processing of this crafted packet will create a sustained Denial of Service (DoS) condition. This is typically configured for Broadband Subscriber Sessions. if the dhcpd server binary was built for a 64-bit architecture OR if the -fstack-protection-strong compiler flag was NOT specified, the crash will not occur, but it is possible for the offending lease and the lease which immediately followed it to be improperly deleted.Īn Improper Input Validation vulnerability in the active-lease query portion in JDHCPD's DHCP Relay Agent of Juniper Networks Junos OS allows an attacker to cause a Denial of Service (DoS) by sending a crafted DHCP packet to the device thereby crashing the jdhcpd DHCP service. Additionally, the offending lease and the lease immediately following it in the lease database may be improperly deleted. In dhcpd, when run in DHCPv4 or DHCPv6 mode: if the dhcpd server binary was built for a 32-bit architecture AND the -fstack-protection-strong flag was specified to the compiler, dhcpd may exit while parsing a lease file containing an objectionable lease, resulting in lack of service to clients. However, on a 32-bit system it is possible to cause dhclient to crash when reading an improper lease, which could cause network connectivity problems for an affected system due to the absence of a running DHCP client process.
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From inspection it is clear that the defect is also present in releases from those series, but they have not been officially tested for the vulnerability), The outcome of encountering the defect while reading a lease that will trigger it varies, according to: the component being affected (i.e., dhclient or dhcpd) whether the package was built as a 32-bit or 64-bit binary whether the compiler flag -fstack-protection-strong was used when compiling In dhclient, ISC has not successfully reproduced the error on a 64-bit system. The router does not reload.Ī vulnerability has been identified in RUGGEDCOM ROS M2100 (All versions 4.1-ESV-R16, ISC DHCP 4.4.0 -> 4.4.2 (Other branches of ISC DHCP (i.e., releases in the 4.0.x series or lower and releases in the 4.3.x series) are beyond their End-of-Life (EOL) and no longer supported by ISC. Note: Only the dhcpd process crashes and eventually restarts automatically. This could temporarily prevent network access to clients that join the network during that time period. While the dhcpd process is restarting, which may take up to approximately two minutes, DHCPv4 server services are unavailable on the affected device. A successful exploit could allow the attacker to cause a NULL pointer dereference, resulting in a crash of the dhcpd process. An attacker could exploit this vulnerability by sending a malformed DHCPv4 message to an affected device. This vulnerability exists because certain DHCPv4 messages are improperly validated when they are processed by an affected device.
#AMT EMULATOR MAC .8 SOFTWARE#
Authenticated attackers can reconfigure dnsmasq via a crafted extra_dhcp_opts value.Ī vulnerability in the DHCP version 4 (DHCPv4) server feature of Cisco IOS XR Software could allow an unauthenticated, remote attacker to trigger a crash of the dhcpd process, resulting in a denial of service (DoS) condition.
An issue was discovered in OpenStack Neutron before 16.4.1, 17.x before 17.2.1, and 18.x before 18.1.1.