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CVE-2020-7457

Status Candidate

Overview

In FreeBSD 12.1-STABLE before r359565, 12.1-RELEASE before p7, 11.4-STABLE before r362975, 11.4-RELEASE before p1, and 11.3-RELEASE before p11, missing synchronization in the IPV6_2292PKTOPTIONS socket option set handler contained a race condition allowing a malicious application to modify memory after being freed, possibly resulting in code execution.

Related Files

FreeBSD ip6_setpktopt Use-After-Free Privilege Escalation
Posted Jul 31, 2020
Authored by Brendan Coles, Andy Nguyen | Site metasploit.com

This Metasploit module exploits a race and use-after-free vulnerability in the FreeBSD kernel IPv6 socket handling. A missing synchronization lock in the IPV6_2292PKTOPTIONS option handling in setsockopt permits racing ip6_setpktopt access to a freed ip6_pktopts struct. This exploit overwrites the ip6po_pktinfo pointer of a ip6_pktopts struct in freed memory to achieve arbitrary kernel read/write.

tags | exploit, arbitrary, kernel
systems | freebsd, bsd
advisories | CVE-2020-7457
SHA-256 | 00b0e1e6a5651af403765318e00556b0c8953f9ef2bbda38acb929b269045b6a
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