CVE-2020-7461 Memory corruption in FreeBSD
A heap overflow in FreeBSD's dhclient allows remote code execution via malformed DHCP options, though limited by sandboxing.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2020-7461?
CVE-2020-7461 is a high-severity memory corruption vulnerability in Freebsd Freebsd, published on 26 Mar 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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.
Weakness: CWE-787
Which versions are affected by CVE-2020-7461?
It affects 3 products.
Products include Freebsd Freebsd, Siemens Simatic Rf350m Firmware, Siemens Simatic Rf650m Firmware.
How do I fix CVE-2020-7461?
No fix has been published for CVE-2020-7461 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2020-7461 being exploited?
There is no known exploitation of CVE-2020-7461 in the wild and no public exploit code.
Public exploit code: 2 proofs of concept on GitHub.
Other vulnerabilities in Freebsd Freebsd
Sources
Also known as GHSA-x566-m9mc-f47w.