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FreeBSD : FreeBSD -- posix_spawnp(3) buffer overflow (f8b46415-c264-11ea-8659-901b0ef719ab)

critical Nessus Plugin ID 138372

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Synopsis

The remote FreeBSD host is missing a security-related update.

Description

posix_spawnp spawns a new thread with a limited stack allocated on the heap before delegating to execvp for the final execution within that thread.

execvp would previously make unbounded allocations on the stack, directly proportional to the length of the user-controlled PATH environment variable. Impact : Long values in the user-controlled PATH environment variable cause posix_spawnp to write beyond the end of stack that was allocated, ultimately overflowing the heap-allocated stack with a direct copy of the value stored in PATH.

Solution

Update the affected package.

See Also

http://www.nessus.org/u?5b909b8a

Plugin Details

Severity: Critical

ID: 138372

File Name: freebsd_pkg_f8b46415c26411ea8659901b0ef719ab.nasl

Version: 1.3

Type: local

Published: 7/10/2020

Updated: 7/23/2020

Configuration: Enable paranoid mode

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 5.9

CVSS v2

Risk Factor: High

Base Score: 7.5

Temporal Score: 5.5

Vector: CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P

CVSS Score Source: CVE-2020-7458

CVSS v3

Risk Factor: Critical

Base Score: 9.8

Temporal Score: 8.5

Vector: CVSS:3.0/AV:N/AC:L/PR:N/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: 7/10/2020

Vulnerability Publication Date: 7/9/2020

Reference Information

CVE: CVE-2020-7458

FreeBSD: SA-20:18.posix_spawnp