AudioCodes Fax Server/Auto-Attendant IVR up to 2.6.23 Windows Service ajaxPost.php system default permission

Summaryinfo

A vulnerability classified as critical was found in AudioCodes Fax Server and Auto-Attendant IVR up to 2.6.23. This vulnerability affects the function system of the file ajaxPost.php of the component Windows Service. Executing a manipulation can lead to default permission. This vulnerability only affects products that are no longer supported by the maintainer. This vulnerability is tracked as CVE-2025-34332. The attack is restricted to local execution. No exploit exists.

Detailsinfo

A vulnerability was found in AudioCodes Fax Server and Auto-Attendant IVR up to 2.6.23. It has been declared as critical. This vulnerability affects the function system of the file ajaxPost.php of the component Windows Service. The manipulation with an unknown input leads to a default permission vulnerability. The CWE definition for the vulnerability is CWE-276. During installation, installed file permissions are set to allow anyone to modify those files. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

AudioCodes Fax Server and Auto-Attendant IVR appliances versions up to and including 2.6.23 include a web administration component that controls back-end Windows services using helper batch scripts located under C:\\F2MAdmin\\F2E\\AudioCodes_files\\utils\\Services. When certain service actions are requested through ajaxPost.php, these scripts are invoked by PHP using system() under the NT AUTHORITY\\SYSTEM account. The batch files in this directory are writable by any authenticated local user due to overly permissive ACLs, allowing them to replace script contents with arbitrary commands. On the next service start/stop operation, the modified script is executed as SYSTEM, enabling elevation of local privileges.

The weakness was disclosed by Pierre Barre. The advisory is available at audiocodes.com. This vulnerability was named CVE-2025-34332 since 04/15/2025. The exploitation appears to be easy. Local access is required to approach this attack. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 12/12/2025). This vulnerability is assigned to T1222 by the MITRE ATT&CK project.

By approaching the search of inurl:ajaxPost.php it is possible to find vulnerable targets with Google Hacking.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Type

• Router Operating System

Vendor

• AudioCodes

Name

• Auto-Attendant IVR
• Fax Server

Version

• 2.6.0
• 2.6.1
• 2.6.2
• 2.6.3
• 2.6.4
• 2.6.5
• 2.6.6
• 2.6.7
• 2.6.8
• 2.6.9
• 2.6.10
• 2.6.11
• 2.6.12
• 2.6.13
• 2.6.14
• 2.6.15
• 2.6.16
• 2.6.17
• 2.6.18
• 2.6.19
• 2.6.20
• 2.6.21
• 2.6.22
• 2.6.23

Support

• end of life

CPE 2.3info

• 🔒
• 🔒
• 🔒

CPE 2.2info

• 🔒
• 🔒
• 🔒

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If you want to get best quality of vulnerability data, you may have to visit VulDB.

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