Published: 26/03/2021 Updated: 16/09/2021

CVSS v2 Base Score: 7.5 | Impact Score: 6.4 | Exploitability Score: 10

CVSS v3 Base Score: 7.3 | Impact Score: 3.4 | Exploitability Score: 3.9

VMScore: 668

Vector: AV:N/AC:L/Au:N/C:P/I:P/A:P

In FreeBSD 12.1-STABLE before r365010, 11.4-STABLE before r365011, 12.1-RELEASE before p9, 11.4-RELEASE before p3, and 11.3-RELEASE before p13, dhclient(8) fails to handle certain malformed input related to handling of DHCP option 119 resulting a heap overflow. The heap overflow could in principle be exploited to achieve remote code execution. The affected process runs with reduced privileges in a Capsicum sandbox, limiting the immediate impact of an exploit.

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freebsd freebsd 11.3
freebsd freebsd 11.4
freebsd freebsd 12.1
siemens simatic_rf350m_firmware
siemens simatic_rf650m_firmware

PoC for DHCP vulnerability (NAME:WRECK) in FreeBSD

CVE-2020-7461 PoC for DHCP vulnerability (NAME:WRECK) in FreeBSD For educational purposes only Environment Host: macOS 1121 Vagrant: 2215 Victim: FreeBSD 121-STABLE r364849 Attacker: Ubuntu 2004 Disclaimer This PoC will cause DoS instead of RCE to prevent abuse PoC Turn off DHCP server in VirtualBox Launch VMs $ cd victim $ vagrant up $ cd

Reproducer PoC for FreeBSD dhclient heap-based buffer overflow vulnerability when parsing DHCP option 119 (CVE-2020-7461)

CVE-2020-7461 Reproducer PoC Authors: Moshe Kol, Shlomi Oberman Reproducer PoC for FreeBSD dhclient heap-based buffer overflow vulnerability when parsing DHCP option 119 (CVE-2020-7461) The problem resides in the function find_search_domain_name_len in the file sbin/dhclient/optionsc This function is called by expand_domain_search when DHCP option 119 (domain search, RFC 339

CWE-787 https://security.FreeBSD.org/advisories/FreeBSD-SA-20:26.dhclient.asc https://cert-portal.siemens.com/productcert/pdf/ssa-288459.pdf https://nvd.nist.gov https://github.com/knqyf263/CVE-2020-7461

CVE-2020-7461

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