Advisory Details

May 19th, 2020

FreeBSD Kernel NAT Out-Of-Bounds Read Information Disclosure Vulnerability

ZDI-20-661
ZDI-CAN-10850

CVE ID CVE-2020-7455
CVSS SCORE 4.1, (AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:N/A:N)
AFFECTED VENDORS FreeBSD
AFFECTED PRODUCTS Kernel
VULNERABILITY DETAILS

This vulnerability allows local attackers to disclose sensitive information on affected installations of FreeBSD Kernel. Authentication is required to exploit this vulnerability.

The specific flaw exists within the implementation of NAT. The issue results from the lack of proper validation of user-supplied data, which can result in a read past the end of an allocated buffer. An attacker can leverage this in conjunction with other vulnerabilities to execute code in the context of kernel.

ADDITIONAL DETAILS FreeBSD has issued an update to correct this vulnerability. More details can be found at:
https://www.freebsd.org/security/advisories/FreeBSD-SA-20:13.libalias.asc
DISCLOSURE TIMELINE
  • 2020-04-17 - Vulnerability reported to vendor
  • 2020-05-19 - Coordinated public release of advisory
CREDIT Vishnu Dev TJ
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