CVE-2024-20506

ClamAV Privilege Handling Escalation Vulnerability

Published Sep 4, 2024 CVSS 3.1 · 6.1 Medium EPSS < 1% KEV · Not listed

Description

A vulnerability in the ClamD service module of Clam AntiVirus (ClamAV) versions 1.4.0, 1.3.2 and prior versions, all 1.2.x versions, 1.0.6 and prior versions, all 0.105.x versions, all 0.104.x versions, and 0.103.11 and all prior versions could allow an authenticated, local attacker to corrupt critical system files.

The vulnerability is due to allowing the ClamD process to write to its log file while privileged without checking if the logfile has been replaced with a symbolic link. An attacker could exploit this vulnerability if they replace the ClamD log file with a symlink to a critical system file and then find a way to restart the ClamD process. An exploit could allow the attacker to corrupt a critical system file by appending ClamD log messages after restart.

Affected Products

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

Cisco

ClamAV

unknown

Version	Status	Constraints
`1.4.0`	affected	—
`1.3.2`	affected	—
`1.0.6`	affected	—
`1.0.5`	affected	—
`1.0.4`	affected	—
`1.0.3`	affected	—
`1.0.2`	affected	—
`1.0.1`	affected	—
`1.0.0`	affected	—
`1.2.x`	affected	—
`0.105.x`	affected	—
`0.104.x`	affected	—
`0.103.11`	affected	—
`0.103.10`	affected	—
`0.103.9`	affected	—
`0.103.8`	affected	—
`0.103.7`	affected	—
`0.103.6`	affected	—
`0.103.5`	affected	—
`0.103.4`	affected	—
`0.103.3`	affected	—
`0.103.2`	affected	—
`0.103.1`	affected	—
`0.103.0`	affected	—

Configuration 1 [-]

OR	cpe:2.3:a:clamav:clamav::::::::
	cpe:2.3:a:clamav:clamav::::::::
	cpe:2.3:a:clamav:clamav::::::::
	cpe:2.3:a:clamav:clamav:1.4.0:::::::*

No data.

No data available yet.

Remediation

No solution or workaround provided in the CVE record

Tracking

Advisories

Source	ID	Title
Debian DLA	DLA-3983-1	clamav security update
EUVD	EUVD-2024-18221	A vulnerability in the ClamD service module of Clam AntiVirus (ClamAV) versions 1.4.0, 1.3.2 and prior versions, all 1.2.x versions, 1.0.6 and prior versions, all 0.105.x versions, all 0.104.x versions, and 0.103.11 and all prior versions could allow an authenticated, local attacker to corrupt critical system files. The vulnerability is due to allowing the ClamD process to write to its log file while privileged without checking if the logfile has been replaced with a symbolic link. An attacker could exploit this vulnerability if they replace the ClamD log file with a symlink to a critical system file and then find a way to restart the ClamD process. An exploit could allow the attacker to corrupt a critical system file by appending ClamD log messages after restart.
Ubuntu USN	USN-7011-1	ClamAV vulnerabilities
Ubuntu USN	USN-7011-2	ClamAV vulnerabilities

Metrics

No CVSS v4.0

Attack Vector Local

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact None

Integrity Impact Low

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploit prediction score: < 1% (0.318% probability within 30 days)

Exploitation none

Automatable no

Technical Impact partial

References

Link	Providers
https://blog.clamav.net/2024/09/clamav-141-132-107-and-010312-security.html
https://lists.debian.org/debian-lts-announce/2024/12/msg00004.html

History

Nov 3, 2025 10:30 PM Added references View changes

Type	Values Removed	Values Added
References		https://lists.debian.org/debian-lts-announce/2024/12/msg00004.html

Jul 12, 2025 1:45 PM Scoring metrics updated View changes

Type	Values Removed	Values Added
Metrics	epss `{'score': 0.00028}`	epss `{'score': 0.00037}`

Sep 12, 2024 5:45 PM First appearance in the feed. Weaknesses updated. Affected versions updated. Affected vendors updated View changes

Type	Values Removed	Values Added
First Time appeared		Clamav Clamav clamav
Weaknesses		CWE-754
CPEs		cpe:2.3:a:clamav:clamav:::::::: cpe:2.3:a:clamav:clamav:1.4.0:::::::*
Vendors & Products		Clamav Clamav clamav

Sep 5, 2024 2:30 PM Scoring metrics updated View changes

Type	Values Removed	Values Added
Metrics		ssvc `{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}`

Sep 4, 2024 9:45 PM Description updated. Title updated. Added references. Scoring metrics updated View changes

Type	Values Removed	Values Added
Description		A vulnerability in the ClamD service module of Clam AntiVirus (ClamAV) versions 1.4.0, 1.3.2 and prior versions, all 1.2.x versions, 1.0.6 and prior versions, all 0.105.x versions, all 0.104.x versions, and 0.103.11 and all prior versions could allow an authenticated, local attacker to corrupt critical system files. The vulnerability is due to allowing the ClamD process to write to its log file while privileged without checking if the logfile has been replaced with a symbolic link. An attacker could exploit this vulnerability if they replace the ClamD log file with a symlink to a critical system file and then find a way to restart the ClamD process. An exploit could allow the attacker to corrupt a critical system file by appending ClamD log messages after restart.
Title		ClamAV Privilege Handling Escalation Vulnerability
References		https://blog.clamav.net/2024/09/clamav-141-132-107-and-010312-security.html
Metrics		cvssV3_1 `{'score': 6.1, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H'}`