AudioCodes Fax Server/Auto-Attendant IVR up to 2.6.23 Fax Test Interface TestFax.php os command injection

Summaryinfo

A vulnerability was found in AudioCodes Fax Server and Auto-Attendant IVR up to 2.6.23. It has been declared as critical. This impacts an unknown function of the file AudioCodes_files/TestFax.php of the component Fax Test Interface. Executing a manipulation can lead to os command injection. This vulnerability only affects products that are no longer supported by the maintainer. This vulnerability appears as CVE-2025-34334. The attack may be performed from remote. There is no available exploit.

Detailsinfo

A vulnerability has been found in AudioCodes Fax Server and Auto-Attendant IVR up to 2.6.23 and classified as critical. This vulnerability affects some unknown processing of the file AudioCodes_files/TestFax.php of the component Fax Test Interface. The manipulation with an unknown input leads to a os command injection vulnerability. The CWE definition for the vulnerability is CWE-78. The product constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component. 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 are vulnerable to an authenticated command injection in the fax test functionality implemented by AudioCodes_files/TestFax.php. When a fax "send" test is requested, the application builds a faxsender command line using attacker-supplied parameters and passes it to GlobalUtils::RunBatchFile without proper validation or shell-argument sanitization. The resulting batch file is written into a temporary run directory and then executed via a backend service that runs as NT AUTHORITY\\SYSTEM. An authenticated attacker with access to the fax test interface can craft parameter values that inject additional shell commands into the generated batch file, leading to arbitrary command execution with SYSTEM privileges. In addition, because the generated batch files reside in a location with overly permissive file system permissions, a local low-privilege user on the server can modify pending batch files to achieve the same elevation.

The weakness was presented by Pierre Barre. The advisory is shared for download at audiocodes.com. This vulnerability was named CVE-2025-34334 since 04/15/2025. The exploitation appears to be easy. The attack can be initiated remotely. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 12/12/2025). The MITRE ATT&CK project declares the attack technique as T1202.

By approaching the search of inurl:AudioCodes_files/TestFax.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.

VulDB is the best source for vulnerability data and more expert information about this specific topic.

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

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CPE 2.2info

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