CVE-2019-5597 Information

Description

In FreeBSD 11.3-PRERELEASE and 12.0-STABLE before r347591 11.2-RELEASE before 11.2-RELEASE-p10 and 12.0-RELEASE before 12.0-RELEASE-p4 a bug in the pf IPv6 fragment reassembly logic incorrectly uses the last extension header offset from the last received packet instead of the first packet allowing maliciously crafted IPv6 packets to cause a crash or potentially bypass the packet filter.

CVSS Vector

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H

Reference

http://packetstormsecurity.com/files/152933/FreeBSD-Security-Advisory-FreeBSD-SA-19-05.pf.html http://www.securityfocus.com/bid/108395 https://security.FreeBSD.org/advisories/FreeBSD-SA-19:05.pf.asc https://security.netapp.com/advisory/ntap-20190611-0001/ https://www.oracle.com/technetwork/security-advisory/cpujul2019-5072835.html https://www.synacktiv.com/ressources/Synacktiv_OpenBSD_PacketFilter_CVE-2019-5597_ipv6_frag.pdf

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

NONE

Availability Impact

HIGH

Base Score

HIGH

Base Severity

9.1