CVE-2025-4134— Lack of file validation in Avast Business Antivirus for Linux allows writing untrusted update files
Quick assessment
Affected
Avast Avast Business Antivirus
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
Avast Business Antivirus是Avast公司的一款商业网络防病毒软件。 Avast Business Antivirus 4.5版本存在安全漏洞，该漏洞源于文件验证不足，可能导致更新文件被篡改。
Possible ATT&CK Techniques 1 AI
T1068 · Exploitation for Privilege Escalation
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I. Basic Information for CVE-2025-4134
Vulnerability Information
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Vulnerability Title
Lack of file validation in Avast Business Antivirus for Linux allows writing untrusted update files
Source: CVE Program / CVE List V5
Vulnerability Description
Lack of file validation in do_update_vps in Avast Business Antivirus for Linux 4.5 on Linux allows local user to spoof or tamper with the update file via an unverified file write.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
对外部实体的文件或目录可访问
Source: CVE Program / CVE List V5
Vulnerability Title
Avast Business Antivirus 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Avast Business Antivirus是Avast公司的一款商业网络防病毒软件。 Avast Business Antivirus 4.5版本存在安全漏洞，该漏洞源于文件验证不足，可能导致更新文件被篡改。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| Avast | Avast Business Antivirus | 4.5.1 | - |
|
II. Public POCs for CVE-2025-4134
| # | POC Description | Source Link | Shenlong Link |
|---|
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V. Comments for CVE-2025-4134
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