Apache Log4Shell RCE detection via callback correlation (Direct Check SMTP)

critical Nessus Plugin ID 156132

Synopsis

The remote mail server allows remote command execution via Log4Shell.

Description

The remote host appears to be running an SMTP server. SMTP itself is not vulnerable to Log4Shell; however, the SMTP server could potentially be affected if it attempts to log data via a vulnerable log4j library.

This plugin requires that both the scanner and target machine have internet access.

Solution

Upgrade to Apache Log4j version 2.15.0 or later, or apply the vendor mitigation.

Upgrading to the latest versions for Apache Log4j is highly recommended as intermediate versions / patches have known high severity vulnerabilities and the vendor is updating their advisories often as new research and knowledge about the impact of Log4j is discovered. Refer to https://logging.apache.org/log4j/2.x/security.html for the latest versions.

See Also

https://logging.apache.org/log4j/2.x/security.html

https://www.lunasec.io/docs/blog/log4j-zero-day/

Plugin Details

Severity: Critical

ID: 156132

File Name: apache_log4shell_smtp.nbin

Version: 1.20

Type: remote

Published: 12/17/2021

Updated: 8/15/2022

Risk Information

VPR

Risk Factor: Critical

Score: 10

CVSS v2

Risk Factor: High

Base Score: 9.3

Temporal Score: 8.1

Vector: AV:N/AC:M/Au:N/C:C/I:C/A:C

Temporal Vector: E:H/RL:OF/RC:C

CVSS Score Source: CVE-2021-44228

CVSS v3

Risk Factor: Critical

Base Score: 10

Temporal Score: 9.5

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

Temporal Vector: E:H/RL:O/RC:C

Vulnerability Information

CPE: cpe:2.3:a:apache:log4j:*:*:*:*:*:*:*:*

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 12/10/2021

Vulnerability Publication Date: 12/9/2021

CISA Known Exploited Dates: 12/24/2021

Exploitable With

CANVAS (CANVAS)

Reference Information

CVE: CVE-2021-44228

IAVA: 2021-A-0573, 0001-A-0650