Memory leak in FreeBSD - CVE-2020-7451
Published: March 19, 2020
Vulnerability identifier: #VU26235
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2020-7451
CWE-ID: CWE-401
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: FreeBSD Foundation
Affected software:
FreeBSD
FreeBSD
Detailed vulnerability description
The vulnerability allows a remote attacker to gain access to sensitive kernel information.
The vulnerability exists due memory leak in IPv6 implementation in FreeBSD, when processing network traffic over TCP, which leads to disclosure of one byte of kernel memory with every TCP SYN-ACK (or challenge TCP-ACK) segment sent over IPv6. A remote attacker can initiate a TCP connection over IPv6 protocol with an affected system and gain access to sensitive information, stored in kernel.
How to mitigate CVE-2020-7451
Install updates from vendor's website.