Use-after-free in FreeBSD - CVE-2020-7457
Published: July 9, 2020 / Updated: July 30, 2020
Vulnerability identifier: #VU29604
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:A/U:Clear
CVE-ID: CVE-2020-7457
CWE-ID: CWE-416
Exploitation vector: Local access
Exploit availability:
Public exploit is available
Vendor: FreeBSD Foundation
Affected software:
FreeBSD
FreeBSD
Detailed vulnerability description
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a race condition followed by a use-after-free error when processing IPv6 header options set by the IPV6_2292PKTOPTIONS socket option. A local user can set specially crafted IPv6 header options, trigger memory corruption and execute arbitrary code on the system with elevated privileges.
How to mitigate CVE-2020-7457
Install updates from vendor's website.