Heap-based buffer overflow in FreeBSD - CVE-2020-7461
Published: September 3, 2020 / Updated: November 30, 2022
Vulnerability identifier: #VU46226
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2020-7461
CWE-ID: CWE-122
Exploitation vector: Adjecent network
Exploit availability:
Public exploit is available
Vulnerability details
The vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to a boundary error when parsing option 119 data in DHCP packets in dhclient(8). A remote attacker on the local network can send specially crafted data to the DHCP client, trigger heap-based buffer overflow and execute arbitrary code on the target system.
Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.
Affected software
FreeBSD
Junos OS
SIMATIC RF350M
SIMATIC RF650M
Junos OS
SIMATIC RF350M
SIMATIC RF650M
How to mitigate CVE-2020-7461
Install updates from vendor's website.
Junos OS - addressed in versions 18.4R2-S10, 18.4R3-S10, 19.1R3-S7, 19.2R1-S8, 19.2R3-S4, 19.3R3-S4, 19.4R2-S6, 19.4R3-S6, 20.1R3-S3, 20.2R3-S3, 20.3R3-S3, 20.4R3, 21.1R2, 21.2R1