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FreeBSD : FreeBSD -- double free in accept_filter(9) socket configuration interface (f8e1e2a6-9791-11eb-b87a-901b0ef719ab)
high Nessus Plugin ID 148527
Synopsis
The remote FreeBSD host is missing a security-related update.Description
An unprivileged process can configure an accept filter on a listening socket. This is done using the setsockopt(2) system call. The process supplies the name of the accept filter which is to be attached to the socket, as well as a string containing filter-specific information.If the filter implements the accf_create callback, the socket option handler attempts to preserve the process-supplied argument string. A bug in the socket option handler caused this string to be freed prematurely, leaving a dangling pointer. Additional operations on the socket can turn this into a double free or a use-after-free. Impact :
The bug may be exploited to trigger local privilege escalation or kernel memory disclosure.
Solution
Update the affected package.See Also
Plugin Details
Severity: High
ID: 148527
File Name: freebsd_pkg_f8e1e2a6979111ebb87a901b0ef719ab.nasl
Version: 1.3
Type: local
Family: FreeBSD Local Security Checks
Published: 4/14/2021
Updated: 4/20/2021
Configuration: Enable paranoid mode
Supported Sensors: Nessus
Risk Information
VPR
Risk Factor: Medium
Score: 5.9
CVSS v2
Risk Factor: High
Base Score: 7.2
Temporal Score: 5.3
Vector: CVSS2#AV:L/AC:L/Au:N/C:C/I:C/A:C
CVSS Score Source: CVE-2021-29627
CVSS v3
Risk Factor: High
Base Score: 7.8
Temporal Score: 6.8
Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C
Vulnerability Information
CPE: p-cpe:/a:freebsd:freebsd:freebsd, cpe:/o:freebsd:freebsd
Required KB Items: Host/local_checks_enabled, Settings/ParanoidReport, Host/FreeBSD/release, Host/FreeBSD/pkg_info
Exploit Ease: No known exploits are available
Patch Publication Date: 4/7/2021
Vulnerability Publication Date: 4/6/2021
Reference Information
CVE: CVE-2021-29627
FreeBSD: SA-21:09.accept_filter