In ISC DHCP 4.1-ESV-R1 -> 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. 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. 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. 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. Additionally, the offending lease and the lease immediately following it in the lease database may be improperly deleted. 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.

Affected Software

CPE Name Name Version
isc:dhcp isc dhcp 4.1-esv
isc:dhcp isc dhcp 4.4.2
fedoraproject:fedora fedoraproject fedora 33
fedoraproject:fedora fedoraproject fedora 34
debian:debian_linux debian debian linux 9.0
siemens:ruggedcom_rox_rx1400_firmware siemens ruggedcom rox rx1400 firmware 2.15.0
siemens:ruggedcom_rox_rx1500_firmware siemens ruggedcom rox rx1500 firmware 2.15.0
siemens:ruggedcom_rox_rx1501_firmware siemens ruggedcom rox rx1501 firmware 2.15.0
siemens:ruggedcom_rox_rx1510_firmware siemens ruggedcom rox rx1510 firmware 2.15.0
siemens:ruggedcom_rox_rx1511_firmware siemens ruggedcom rox rx1511 firmware 2.15.0
siemens:ruggedcom_rox_rx1512_firmware siemens ruggedcom rox rx1512 firmware 2.15.0
siemens:ruggedcom_rox_rx1524_firmware siemens ruggedcom rox rx1524 firmware 2.15.0
siemens:ruggedcom_rox_rx1536_firmware siemens ruggedcom rox rx1536 firmware 2.15.0
siemens:ruggedcom_rox_rx5000_firmware siemens ruggedcom rox rx5000 firmware 2.15.0
siemens:ruggedcom_rox_mx5000_firmware siemens ruggedcom rox mx5000 firmware 2.15.0
netapp:ontap_select_deploy_administration_utility netapp ontap select deploy administration utility -
netapp:solidfire_\&_hci_management_node netapp solidfire \& hci management node -
siemens:sinec_ins siemens sinec ins 1.0