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F5 Networks BIG-IP : TMOS Shell privilege escalation vulnerability (K00091341)

high Nessus Plugin ID 137913

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Synopsis

The remote device is missing a vendor-supplied security patch.

Description

An authorized user provided with access only to the TMOS Shell (tmsh) may be able to conduct arbitrary file read/writes via the built-in sftp functionality. (CVE-2020-5907)

Impact

A malicious actor who has gained access to a restricted account with tmsh access (for example, a user who has Terminal Access set to tmsh and not Advanced shell ) may be able to read or write to arbitrary files on the file system using the built-in sftp functionality and use that access to construct a privilege escalation attack in order to gain root access to the BIG-IP system.

Solution

Upgrade to one of the non-vulnerable versions listed in the F5 Solution K00091341.

See Also

https://my.f5.com/manage/s/article/K00091341

Plugin Details

Severity: High

ID: 137913

File Name: f5_bigip_SOL00091341.nasl

Version: 1.8

Type: local

Published: 7/1/2020

Updated: 11/2/2023

Configuration: Enable paranoid mode

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 5.9

CVSS v2

Risk Factor: Medium

Base Score: 6

Temporal Score: 4.4

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

CVSS Score Source: CVE-2020-5907

CVSS v3

Risk Factor: High

Base Score: 7.2

Temporal Score: 6.3

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

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: cpe:/a:f5:big-ip_access_policy_manager, cpe:/a:f5:big-ip_advanced_firewall_manager, cpe:/a:f5:big-ip_application_acceleration_manager, cpe:/a:f5:big-ip_application_security_manager, cpe:/a:f5:big-ip_application_visibility_and_reporting, cpe:/a:f5:big-ip_domain_name_system, cpe:/a:f5:big-ip_global_traffic_manager, cpe:/a:f5:big-ip_link_controller, cpe:/a:f5:big-ip_local_traffic_manager, cpe:/a:f5:big-ip_policy_enforcement_manager, cpe:/h:f5:big-ip

Required KB Items: Host/local_checks_enabled, Settings/ParanoidReport, Host/BIG-IP/hotfix, Host/BIG-IP/modules, Host/BIG-IP/version

Exploit Ease: No known exploits are available

Patch Publication Date: 6/30/2020

Vulnerability Publication Date: 7/1/2020

Reference Information

CVE: CVE-2020-5907

IAVA: 2020-A-0283-S