FreeBSD : FreeBSD -- telnet(1) client multiple vulnerabilities (39f6cbff-b30a-11e9-a87f-a4badb2f4699)

high Nessus Plugin ID 127542

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Synopsis

The remote FreeBSD host is missing one or more security-related updates.

Description

Insufficient validation of environment variables in the telnet client supplied in FreeBSD can lead to stack-based buffer overflows. A stack- based overflow is present in the handling of environment variables when connecting via the telnet client to remote telnet servers.

This issue only affects the telnet client. Inbound telnet sessions to telnetd(8) are not affected by this issue. Impact : These buffer overflows may be triggered when connecting to a malicious server, or by an active attacker in the network path between the client and server. Specially crafted TELNET command sequences may cause the execution of arbitrary code with the privileges of the user invoking telnet(1).

Solution

Update the affected packages.

Plugin Details

Severity: High

ID: 127542

File Name: freebsd_pkg_39f6cbffb30a11e9a87fa4badb2f4699.nasl

Version: 1.3

Type: local

Family: FreeBSD Local Security Checks

Published: 8/12/2019

Updated: 5/7/2024

Configuration: Enable paranoid mode

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 6.7

CVSS v2

Risk Factor: Medium

Base Score: 4.6

Temporal Score: 3.6

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

CVSS Score Source: CVE-2019-0053

CVSS v3

Risk Factor: High

Base Score: 7.8

Temporal Score: 7

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:P/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 Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 7/30/2019

Vulnerability Publication Date: 7/24/2019

Reference Information

CVE: CVE-2019-0053

FreeBSD: SA-19:12.telnet

Detections

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